To see the other types of publications on this topic, follow the link: Neutrino interactions.
Dissertations / Theses on the topic 'Neutrino interactions'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Neutrino interactions.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Szafron, Robert. "General description of neutrino oscillations with non-standard interactions." Doctoral thesis, Katowice : Uniwersytet Śląski, 2012. http://hdl.handle.net/20.500.12128/5275.
Full textAbstract:
We present a formalism describing neutrino oscillations in any application beyond
the Standard Model theory. Instead of using the standard pure states approach,
we apply the density matrix formalism. In general, in New Physics models,
neutrino states are no longer as pure as they are in the Standard Model. We discuss
the details of the appearance of a mixed state, following which possible New Physics
effects are taken at the levels of both the production and detection processes. We
present a number of examples of calculations with our formalism, using muons as
a source of neutrinos and different detection process. We also show the connection
between normal formulae, derived by assuming pure states, and proper results
based on the density matrix approach. The difference occurs at the second order
in parameters describing the departure from the Standard Model. Finally, as an
application of our formalism, we also demonstrate that it is possible to distinguish
Dirac and Majorana neutrinos in oscillations when New Physics scalar interactions
are present.
2
Tsang, Ka-vang, and 曾嘉宏. "A search for periodic neutrino signals and gamma-ray burst neutrinos with the Sudbury Neutrino Observatory." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B3194324X.
Full text
3
Tsang, Ka-vang. "A search for periodic neutrino signals and gamma-ray burst neutrinos with the Sudbury Neutrino Observatory." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B3194324X.
Full text
4
Roda, Marco. "Study of multiple vertices neutrino interactions in the OPERA experiment." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3426767.
Full textAbstract:
OPERA is a long baseline neutrino experiment designed for tau neutrino searches in
an almost pure muon neutrino beam. The detection is performed on an event-by-event
basis which is possible thanks to the high spatial resolution of the detector.
In fact, the set-up is able to observe very short decaying particles produced
in neutrino interactions, such as tau or charmed particles. In particular, the
experiment searches for events with one secondary vertex within 1 mm from
the primary one.
An event was recorded with an unexpected topology: instead of one
secondary vertex it has two. Such an event was completely unexpected and
a totally new analysis was required in order to understand its nature. The
possibilities taken into account include most of the combinations of tau,
charmed particle and hadron re-interaction within the lead.
The new software, based on GEANT4, was set-up and successfully tested
using a dedicated OPERA test beam. Thus, an ad hoc Monte Carlo generation
was prepared in order to describe the properties of such a rare observation.
Finally, a sample having the interesting topology was obtained and a blind
procedure for the event identification could be developed.
The event turned out to be very likely an tau neutrino interaction with charm
production with a significance close to 3.5 sigma.OPERA è un esperimento per lo studio di neutrini da fascio progettato per ricerca di neutrini del tau in un fascio quasi puro di neutrini muonici. La ricerca è basata su un’analisi evento per evento che è resa possibile dall’elevata risoluzione spaziale del rivelatore. Infatti, l’apparato è in grado di osservare particelle emesse durante un’interazione di neutrino che decadono entro brevi distanze. In particolare, l’esperimento ricerca eventi che presentano vertici secondari entro circa un millimetro dal vertice primario di interazione. Un evento interessante è stato osservato con una topologia inaspettata: invece un solo vertice secondario ne sono stati osservati due. Questo tipo di eventi era completamente inaspettato e una nuova analisi era necessaria per capire la natura dell’evento. Le possibilità considerate includono quasi tutte le combinazioni di tau, particelle charmate e reinterazioni adroniche nel piombo. Un nuovo algoritmo di simulazione, basato su GEANT4, è stato sviluppato e testato con successo usando i dati di uno dei test beam di OPERA. Quindi, una nuova produzione Monte Carlo è stata preparata per poter descrivere le proprietà di questo raro fenomeno. Infine, è stata preparata un’analisi per l’identificazione dell’evento osservato. L’evento è risultato essere molto probabilmente un’interazione di neutrino del tau con produzione di charm, con una significanza di quasi 3.5 sigma.
5
George, Jeffrey S. "Experimental study of the atmospheric [Nu][mu]/[Nu]e ratio in the multi-GeV energy range /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/9752.
Full text
6
Ahlgren, Björn. "Astrophysical Constraints on Secret Neutrino Interactions." Thesis, KTH, Teoretisk fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137181.
Full text
7
Chung, Jin-Hyuk. "Search for neutron oscillation and study of neutrino reaction rates using multiprong events in Soudan 2 /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2001.
Find full textAbstract:
Thesis (Ph.D.)--Tufts University, 2001.Adviser: W. Anthony Mann. Submitted to the Dept. of Physics. Includes bibliographical references (leaves 125-130). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
8
Kikawa, Tatsuya. "Measurement of Neutrino Interactions and Three Flavor Neutrino Oscillations in the T2K Experiment." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/195958.
Full text
9
Ferchichi, Chiraz. "Study of neutrino interactions in the near detector of T2K." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112106.
Full textAbstract:
L’expérience T2K étudie les propriétés des neutrinos, en particulier le phénomène d’oscillation des neutrinos. Se déroulant au Japon, elle utilise un faisceau de neutrinos muoniques produit par le complexe d’accélérateur J-PARC, un détecteur proche, ND280 sur le site même de J-PARC pour caractériser le faisceau, et un détecteur lointain, Super-Kamiokande situé à 295 km pour mesurer les oscillations de neutrinos. Le détecteur proche permet également d’étudier les interactions des neutrinos et cette thèse porte sur la mesure des sections efficaces de diffusion profondément inélastique des neutrinos muoniques.Le manuscrit introduit d’abord la physique des neutrinos, puis l’expérience T2K et en particulier les chambres à projection temporelles du détecteur proche, en insistant sur la vérification de la qualité des données, dont j’avais la charge. L’analyse porte sur les données de T2K enregistrées jusqu’en 2013. La sélection d’interactions de neutrinos muoniques par courant chargé est ensuite présentée, ainsi qu’une étude préliminaire de la sélection d’interactions de neutrinos muoniques par courant chargé avec production d’un pion neutre. Un critère portant sur la multiplicité des traces permet d’enrichir le premier lot en interactions correspondant à une diffusion profondément inélastique de neutrinos. Finalement un ajustement, validé d’abord sur des données simulées, permet d’extraire les sections efficaces de diffusion profondément inélastique des neutrinos muoniquesThe T2K experiment studies the properties of neutrinos, particularly neutrino oscillations. It takes place in Japan and uses a muonic neutrino beam produced by the J-PARC accelerator complex, a near detector, ND280 on the J-PARC site in order to characterise the beam, and a far detector, Super-Kamiokande 295 km away in order to measure the neutrino oscillations. The near detector is also used to study the neutrino interactions and the goal of this thesis is the measurement of muonic neutrino deep inelastic scattering cross sections.The thesis first introduces neutrino physics, then the T2K experiment and more particularly the time projection chambers of the near detector, and its data quality checking that I was in charge of. The analysis is based on the T2K data recorded until 2013. The selection of charged current muonic neutrino interactions is then presented, as well as a preliminary study of the selection of charged current muonic neutrino interactions with the production of a neutral pion. A criterion on track multiplicity allows enriching the former sample in interactions corresponding to a neutrino deep inelastic scattering. Finally a fit, first validated on simulated data, allows the extraction of the muonic neutrino deep inelastic scattering cross sections
10
Cuha, Volkan. "Study Of Neutrino Interactions In The Chorus Experiment." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607891/index.pdf.
Full textAbstract:
The emulsion target of the CHORUS detector was exposed to the
wide-band neutrino beam of the CERN SPS between the years 1994 and 1997. In total about 130.000 neutrino interactions were located in the nuclear emulsion target and fully reconstructed. Detailed DATA and Monte Carlo (MC) comparisons were done in order to test reliability of the detector simulation. There is reasonable agreement between DATA and MC. The ratio of deep inelastic neutral-current (NC) to the deep inelastic (DIS) charged-current(CC) $nu_{mu}$ interactions was measured to be frac{NC_{dis}}{CC_{dis}}=0.350pm0.003$. This measurement was compared with the previous measurements. Based on three double charm decays found in NC interactions we measured the ratio of double charm cross-section in NC $nu_{mu}$ interactions to be [ frac{sigma
(cbar{c}nu_mu)}{sigma_{NC}}=(3.37^{+3.06}_{-2.51}(stat.)pm
0.51(syst.))times 10^{-3}. ] One double charm decay has been observed in CC $nu_{mu}$ interactions the upper limit on associated charm production in $nu_{mu}$ CC interaction has been found to be [ frac{sigma cbar{c}mu^{-})}{sigma_{CC}}<9.69 times 10^{-4}. ] at 90% C.L.
11
Kamiscioglu, Mustafa. "Analysis Of Neutrino Interactions In The Opera Experiment." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614023/index.pdf.
Full textAbstract:
OPERA stands for Oscillation Project with Emulsion t-Racking Apparatus. The main goal of the OPERA experiment is to search for tau neutrino appearance in almost pure muon neutrino beam. The detector is located at Gran Sasso, 730 km away from the neutrino source, at CERN. In this thesis, the reconstruction efficiency and purity of neutrino interactions in the OPERA target have been studied by using Monte Carlo simulation. The efficiency of primary vertex reconstruction for muon neutrino Charge Current (CC) events is estimated as 83.2 percent. The main source of inefficiency is due to Quasi-elastic like topologies in which only one track is reconstructed. The purity of primary vertex tracks is found to be 99 percent. On the other hand, the reconstruction efficiency for muon neutrino CC charm events is estimated to be 90.2 percent, while the purity of the primary tracks is 67 percent. The low purity is due the fact that the secondary vertex tracks are wrongly assigned in the primary vertex. This spoils the purity.
12
Boardman, Robert James. "The detection of Cerenkov radiation from neutrino interactions." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315715.
Full text
13
Hamilton, Philip. "A study of neutrino interactions in argon gas." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/26933.
Full textAbstract:
The T2K (Tokai to Kamioka) experiment uses an intense off-axis muon neutrino beam to study neutrino oscillations through muon neutrino disappearance and electron neutrino appearance. As T2K and other neutrino oscillation experiments move beyond the regime in which they are statistically limited, uncertainties on neutrino-nucleus cross-sections have become increasingly significant as a limiting factor on the precision of these experiments, and on the next generation of detectors. Reducing these uncertainties requires a better understanding of neutrino-nucleus interactions through empirical study. This thesis describes the first ever measurement of neutrino-nucleus interactions on a gaseous target, using the intense T2K beam and the three gaseous argon time-projection chambers in the T2K near detector, ND280. I identify 63 neutrino interaction candidates, and make a comparison of the charged-current muon neutrino differential cross-section with respect to proton multiplicity between data and the simulation packages NEUT and GENIE. This thesis also describes the methods developed to select the gas interactions data sample, which by virtue of the detailed reconstruction available in the ND280 TPCs offers further opportunities to test the predictions of nuclear models than those that are covered by this thesis. Future generations of this analysis are expected to expand both the size of the sample and the range of variables tested.
14
Nakajima, Yasuhiro. "A Measurement of Neutrino Charged Current Interactions and a Search for Muon Neutrino Disappearance with the Fermilab Booster Neutrino Beam." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142374.
Full text
15
Castillo, Fernández Raquel. "Measurement of the Muon Neutrino Charged Current interactions and the muon neutrino single pion cross section on CH using the T2K near detector." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/305239.
Full textAbstract:
El experimento T2K es un experimento de neutrinos de largo recorrido
que utiliza un haz casi puro the neutrinos muónicos. El objetivo
principal del experimento es a medida de los parámetros de
oscilación del neutrino muónicos. Para conseguir éste
objetivo, T2K necesita una rigurosa predicción del índice de
interacciones en el detector lejano, Super-KamiokaNDE. El detector
cercano de T2K, ND280, calcula el índice de interacciones y estima
el número de eventos en el detector lejano.
Las interacciones de neutrino muónico de corriente cargada en el
detector cercano (ND280) son usadas para predecir el índice de
eventos en el detector lejano (Super-KamiokaNDE). Para una mejor
restricción de los parámetros de sección eficaz, los
cuales dominan el análisis junto con las incertezas de la
prediccion del flujo, categorizamos los eventos seleccionados en tres
grupos de acuerdo con el número de piones en el estado
final. Estas tres categorías permiten un mejor ajuste de la
señal del canal de oscilación (Corriente Cargada
Quasielástica) y el principal ruído en oscilaciones (Corriente
Cargada de 1 Pión Cargado).
Actuales y futuros experimentos de neutrinos están limitados por
las incertezas en las secciones eficaces de neutrinos. Los modelos
actuales de sección eficaz están en tension con los datos
experimentales en algunos rangos energéticos. Esto hace que sea
critico estudiar secciones eficaces de neutrino--nucleo en todos los
canales de interacción posibles. La producción the un solo
pión en interacciones de neutrino muónico de corriente cargada
es uno de los principales canales en tensión con los modelos. Como
segunda contribución, presentamos el cálculo de producción
the un solo pión en interacciones de neutrino muónico de
corriente cargada usando un enfoque indepenediente del modelo
explorando la capacidad total del detector ND280 para establecer las
distribuciones cinemáticas del evento. La mejore del conocimiento
de las interacciones, y en concreto del canal de producción de un
sólo pión, permitirá la reducción de las
incertidumbres sistemáticas en el análisis de oscilaciones.The T2K experiment is a long baseline neutrino experiment which utilizes an almost pure muon neutrino beam. The main goal of the experiment is the measurement of the oscillation parameters of the muon neutrinos. In order to achieve this goal, T2K requires an accurate prediction of the interaction rates in the far detector, Super-KamiokaNDE. The near detector of T2K, ND280, measures the interaction rates and estimates the number of events at the far detector. The muon neutrino charged current interactions in the near detector (ND280) are used to predict the rate at the far detector (Super-KamiokaNDE). To a better constrain of the cross section parameters, which are dominant in the analysis together with the flux uncertainty, we categorize the selected events in three different samples according to the number of pions in the final state. These categories allow for a better constrain of the oscillation signal channel (Charged Current Quasielastic) and the main oscillation background (Charged Current 1 Charged Pion). Current and future neutrino experiments are limited by neutrino cross section uncertainties. The actual cross section models are in tension with the experimental data in some energy ranges. It is still critical to study neutrino-nucleus cross sections on all possible interaction channels. The muon neutrino charged current single pion production is one of the main channels in tension with the model. As a second contribution, we present the measurement of the Charged Current single positive pion production cross section using a model independent approach exploring the full capability of the ND280 detector to determine the kinematical distributions of the event. The improved knowledge of the interactions, and in concrete for the single pion channel, will allow the reduction of the the systematical uncertainties in the oscillation analysis.
16
Gamsizkan, Halil. "A Qcd Analysis Of High Energy Neutrino-nucleon Interactions." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1006428/index.pdf.
Full textAbstract:
In this thesis, a leading-order QCD analysis of structure functions in neutrinonucleon
interactions is performed. From the CCFR nucleon structure function
data, the QCD parameter Lambda has been extracted. This measurement also
corresponds to a measurement of the strong coupling constant. Two fits to the
data have been performed, the nonsinglet-only fit and the singlet-nonsinglet
combined fit. The result for Lambda was found to be 289 +62
¡59 §
76 MeV, where the errors are statistical and systematical, respectively. This result is compared to the world-wide measurements of this quantity. In order to verify the agreement, also the logarithmic slopes of the QCD model and the structure function data are calculated and compared.
17
Stowell, John Patrick. "Effects of nucleon and nuclear structure in neutrino interactions." Thesis, University of Sheffield, 2019. http://etheses.whiterose.ac.uk/22623/.
Full textAbstract:
As the precision of neutrino experiments is steadily improving, new data is beginning to highlight problems with current models of neutrino interactions. There exist several unresolved tensions within the global neutrino scattering dataset, and faced with these problems, experiments are forced to turn to data-driven models with errors that can span the spread in experimental observations. The NUISANCE software package was developed to provide a flexible framework for the community to use in the building of these models. This thesis focuses on the extraction of empirical model corrections, to account for several observed tensions in the global scattering dataset, that could have an impact on the T2K oscillation analysis. Charged current neutrino interaction measurements from MiniBooNE are used to study systematic shifts when tuning the NEUT event generator under different sterile neutrino mixing hypotheses. The results are used to derive an error rescaling method for use in future T2K short baseline oscillation fits. Alternative models for the quasi-elastic axial form factor are developed, and implemented into NEUT. Data from neutrino-deuterium scattering is used to test each model's implementation, and extract systematic uncertainties for input to the T2K long baseline oscillation analysis. In addition, NEUT predictions are compared to CC-inclusive data from the MINERvA experiment, highlighting a clear deficiency in its CC0π model. An empirical correction to both the quasi-elastic and multi-nucleon contributions is developed to account for this. Exclusive data from MINERvA is also used to test the GENIE event generator's pion production model. The standard GENIE dials are found to provide insufficient coverage of the chosen datasets, and clear tensions are found between these results and earlier tunings to deuterium scattering data. An ad-hoc model correction is developed to account for disagreements in the muon scattering angle distributions, reducing the tensions in the joint fits.
18
Hiramoto, Ayami. "Measurement of Neutrino Interactions on Water using Nuclear Emulsion Detectors." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263462.
Full text
19
Reichenbacher, Jürgen. "Final KARMEN results on neutrino oscillations and neutrino-nucleus interactions in the energy regime of supernovae." Karlsruhe FZKA, 2005. http://bibliothek.fzk.de/zb/berichte/FZKA7093.pdf.
Full text
20
Houdy, Thibaut. "Testing non-standard neutrino interactions from 8B solar neutrino rate measurement with Borexino to characterization of the 144Ce source of the SOX experiment." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC209/document.
Full textAbstract:
Le détecteur Borexino, situé au laboratoire souterrain du Gran Sasso (LNGS), mesure les neutrinos solaires depuis 10 ans. Parmi les neutrinos solaires, le spectre continu du 8B jusqu’à 17 MeV permet de tester la zone de transition de l’effet de résonance dans la matière dit effet MSW. Cette nouvelle analyse augmente d’un ordre de grandeur la statistique par rapport à la précédente mesure de Borexino publiée en 2011. Pour ce faire, l’ensemble du volume scintillant a été inclus dans l’analyse, aucune coupure géométrique n’ayant été effectué au dessus de 5 MeV. Cela a permis l’identification d’un nouveau bruit de fond non pris en compte précédemment. L’ensemble des bruits de fond au dessus de 3 MeV est maintenant compris et la composante neutrino peut-être extraite d’un fit radial du détecteur. Afin de tester l’existence d’un neutrino stérile léger, une source de 3-5,5 PBq de 144Ce sera installée sous Borexino au début de l’année 2018 pour un an et demi de prise de données : c’est l’expérience CeSOX. Cette source est produite par PA MAYAK par purification de combustible nucléaire usagé, par conséquent les potentiels contaminants radioactifs sont très nombreux et peu contraints. Pour tester l’hypothèse stérile, une mesure en flux, une mesure en forme et une mesure combinée seront effectuées dans l’ensemble du détecteur Borexino. Ces mesures sont fortement dépendantes de la connaissance intime de la source (composition, forme du spectre beta du 144Ce, énergie moyenne 144Ce et 144Pr). A cette fin, un spectromètre gamma a été spécifiquement étalonné et entièrement simulé au CEA, Saclay. De même un spectromètre beta a été dessiné, assemblé, simulé et est en cours d’étalonnage. Finalement, des mesures de spectrométrie alpha et de masse seront réalisés sur des échantillons représentatifs envoyés au CEA, Saclay afin de contraindre au mieux la composition de la source de 144Ce de SOXLocated in the Gran Sasso underground laboratory (LNGS), Borexino measures solar neutrinos for 10 years. Among solar neutrinos, 8B continuous spectrum (up to 17 MeV) enables to test the transition zone between vacuum and matter regime of the MSW effect. This new measurement increases by one order of magnitude the exposure with respect to previous Borexino publication. To do so, the entire active volume is considered in this analysis above 5 MeV. A new background has been identified and a radial fit is done above 3 and 5 MeV enabling to extract the neutrino component. Existence of a light sterile neutrino would have important consequences on astrophysics and cosmology. SOX is the only experiment aiming at testing this hypothesis using a punctual radioactive source. A 3-5.5 PBq 144Ce source is actually under production and will be positioned under Borexino in 2018. Precise knowledge of the source is one of the main challenge of this experiment, based on rate and shape neutrino measurement. Two critical parameters are the heat released by the source for activity measurement and the expected neutrino spectrum in the detector. We first describe the SOX experiment insisting on 144Ce source production. Then, we focus on Saclay installations dedicated to constrain radioactive contamination inside the source using representative samples. Alpha, gamma and mass spectroscopy calibration and simulation are discussed and competitive constrains are derived. A status on 144Ce beta shape measurements is done as well as presentation of future measurement
21
Ashida, Yosuke. "Measurement of Neutrino and Antineutrino Neutral-Current Quasielastic-like Interactions and Applications to Supernova Relic Neutrino Searches." Kyoto University, 2020. http://hdl.handle.net/2433/253077.
Full text
22
Ives, Sarah Joanne. "Study of the kaon contribution to the T2K neutrino beam using neutrino interactions in the Near Detector." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/17787.
Full textAbstract:
T2K is a long-baseline neutrino oscillation experiment. It uses an accelerator- produced neutrino beam, whereby a beam of protons impinges on a nuclear target, producing kaon and pion mesons that decay to neutrinos. The main neutrino detectors are situated at 2.50 off-axis from the centre of the beam. An accurate flux prediction for this off-axis beam is crucial to achieve the sensitivity required for the goals of T2K. External experiments reduce the major flux uncertainty (hadronic interactions in the target), but are inherently independent of the real and variable beamline conditions of T2K. Therefore, in situ measurements are required to validate the flux. This thesis uses data from the T2K near detector (ND280) to validate the ux prediction. The normalisation of K+-originating neutrinos at the ND280 is measured. The K+ beam component is important since K+ daughters dominate the high energy part of the μ beam and contribute to the intrinsic e contamination. As many aspects of the beam simulation affect this measurement, including the hadron production at the target and the off-axis angle, it is used to validate the entire system. The November 2010 to March 2011 data set is used, corresponding to 7:837 x 1019 protons on target. μ charged-current interactions are selected (with 86.3% purity) using the ND280 tracker and binned according to the momentum and angle of the muon candidate. The Monte Carlo (MC) is fitted to the data to extract the normalisations of both K+ and π+ originating neutrinos, bK and bπ respectively. The flux, cross-section and detector systematic errors are considered. The best fit point is at bK = 0:86 and bπ = 0:78, consistent with the nominal MC at the 1σ level. Additionally, results of the first time calibration of the ND280 detector, primarily of the ECal sub-detector, are presented.
23
Varvell, K. E. "Structure functions in neutrino and antineutrino neon interactions in BEBC." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371573.
Full text
24
Larkin, Edward. "A cross section measurement from neutrino interactions on argon gas." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/88889/.
Full textAbstract:
T2K is a neutrino oscillation experiment using an off-axis beam of muon neutrinos. We use its ND280 near detector to make measurements of neutrino interactions in argon gas. Long baseline neutrino experiments are approaching the point of being limited by systematic uncertainties on neutrino-nucleus cross sections rather than only statistics. This makes it imperative for a proper understanding of such processes to reduce their uncertainties. A gas interaction analysis provides a way to gain such an understanding. This thesis describes the first successful neutrino–nucleus cross section measurement performed on gas. The TREx reconstruction algorithms developed for this goal feature a novel path finding based pattern recognition algorithm and have now become the official TPC reconstruction software for the T2K experiment. The analysis itself uses real data and Monte Carlo based on the NEUT and GENIE neutrino interaction generators. The distributions of these results with respect to muon and proton kinematics and proton multiplicity are discussed in the context of differences between the two generators. The ND280 TPCs have the advantage of detailed reconstruction which affords unique opportunities to test the agreement with data of nuclear models used in simulation. Future generations of this analysis are expected to produce more varied and precise measurements in this vein.
25
Girardi, Ivan. "Discrete Symmetry Approach to Lepton Flavour, Neutrino Mixing and Leptonic CP Violation, and Neutrino Related Physics Beyond the Standard Theory." Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/4923.
Full textAbstract:
The experimental evidences of neutrino oscillation, caused by non-zero neutrino masses and neutrino mixing, which were obtained in the experiments with solar, atmospheric, accelerator and reactor neutrinos, opened new field of research in elementary particle physics. The principal goal is to understand at fundamental level the mechanism giving rise to non-zero neutrino masses and neutrino mixing. The open fundamental questions include those of the nature — Dirac or Majorana — of massive neutrinos, of the type of spectrum neutrino masses obey, of the status of CP symmetry in the lepton sector, of the absolute scale of neutrino masses, and more generally, of understanding the origin of flavour in particle physics. The smallness of neutrino masses suggests that their values are related to the existence of a new fundamental mass (energy scale) in particle physics, i.e., to New Physics beyond that predicted by the Standard Theory. The New Physics can manifest itself in the Majorana nature of massive neutrinos, in the existence of sterile neutrinos with masses at the eV scale, in the existence of new non-standard interactions (NSI) of neutrinos, etc. The present Ph.D. thesis explores aspects of this neutrino-related New Physics. More specifically, we first employ the discrete flavour symmetry approach i) to construct a self-consistent theory of lepton flavour, ii) to understand the pattern of neutrino mixing and to describe it quantitatively, and iii) to derive predictions for leptonic Dirac CP violation. Next we investigate the effects of existence of sterile neutrinos with a Majorana mass at the eV scale on the predictions for the neutrinoless double beta decay effective Majorana mass. Further we present a possible interpretation of the results of the reactor neutrino and accelerator experiments (Daya Bay, RENO, Double Chooz and T2K) on the reactor angle θ13 in the neutrino mixing matrix in terms of non-standard interactions (NSI) of neutrinos. We also analyse the signatures of sterile neutrinos in reactor antineutrino experiments and, in particular, constrain the active-sterile mixing angle using the high-precision data of the Daya Bay reactor experiment. We finally investigate the impact of sterile neutrinos on precision measurements of the standard neutrino oscillation parameters in the upcoming neutrino experiment JUNO.
26
Furmanski, Andrew P. "Charged-current Quasi-elastic-like neutrino interactions at the T2K experiment." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/74036/.
Full textAbstract:
T2K is a long-baseline neutrino oscillation experiment based in Japan. The experiment has already measured the appearance of ⌫e in a ⌫μ beam, and is hoping to measure the appearance of ⌫¯e in a ⌫¯μ beam, which would open the possibility of observing CP-violation in the lepton sector. The charged current quasi-elastic (CCQE) interaction (vμ + n -> μ− + p) is of great importance to T2K as it is expected to make up over 80% of the interactions at the oscillation peak (600 MeV). In recent years it has become clear that the most common model describing CCQE interactions on nuclei, the Relativistic Fermi Gas (RFG) model, is not able to describe low energy data on nuclear targets. An alternative model, the Spectral Function (SF) model, was implemented in the NEUT interaction generator. Relevant uncertainties in this model are identified and evaluated. The charged current quasi-elastic-like cross section is then measured using the T2K near detector, ND280, as a function of muon momentum and angle. This data is then critically compared to the predictions from two implementations of the RFG model, and also to the newly implemented SF model. The total integrated cross section is found to be (4.06 ± 0.757) x 10−39 cm2 nucleon−1. This value is currently in agreement with all three predictions.
27
Acero, Ortega Mario Andrés. "Neutrino oscillations in gallium and reactor experiments and cosmological effects of a light sterile neutrino." Chambéry, 2009. http://www.theses.fr/2009CHAMS002.
Full textAbstract:
Nous étudions l'anomalie observée dans les expériences de source radioactive Gallium, faites pour tester les détecteurs Gallium solar neutrino GALLEX et SAGE, mesure d'un nombre total des événements était inférieur a celui attendu. Nous avons interprété cette anomalie comme une indication possible de la disparition des neutrinos électroniques et, dans le cadre effectif de mélange de neutrinos à deux saveurs, nous avons obtenu sin2 2Ө> 0. 03 et « delta »m² > 0. 1 eV2. La compatibilité de ce résultat avec les données des expériences sur la disparition des antineutrinos dans les réacteurs de Bugey et Chooz est étudié. Nous avons constaté que les données de Bugey présentent une indication des oscillations des neutrinos avec 0. 02< sin² 2Ө <0. 07 et « delta »m2 = 1. 95eV 2 ,ce qui est compatible avec la région permise des paramètres de mélange. En combinant les données de Gallium, Bugey et Chooz, cette indication persiste, avec une compatibilité acceptable des données expérimentales. Nous avons analysé les données expérimentales de les expériences du réacteur nucléaire Gösgen, et nous avons obtenu des limites supérieures pour les paramètres de mélange, en excluant la région avec sin2 2Ө> 0. 3 et « delta »m> 0. 05 eV2 at 3ơ- C. L. . En utilisant la combinaison de ces données avec celles de Gallium, Bugey et Chooz, l'indication des oscillations des neutrinos persiste avec 0. 03< sin2 2Ө <0. 07 et « delta »m2 =1. 93 eV2, avec une bonne compatibilité des données. Cependant, l'hypothèse d'aucunes oscillations ne peut pas être exclue. Également, nous avons ajusté des données cosmologiques récentes avec un modèle ACDM étendu, en incluant des reliques légères d'une massa dans l'intervalle 0. 1-10 eV. Nous avons obtenu des contraintes sur la densité actuelle et la dispersion de vélocité de ces reliques, et sur leurs masses, en supposant qu'elles sont constituées ou bien des reliques découplées tôt, ou bien des neutrinos stériles produits non-résonnamment. Nous avons constaté, que, au niveau de confidence 3ơ- , un neutrino stérile avec une masse de ms = 2 eV, peut être facilité avec les données, à condition qu'il soit distribué thermalement avec TsTid v < 0. 8, ou qu'il soit produit non-rsonnamment avec Neff < 0. 5We study the anomaly observed in the Gallium radioactive source experiments, performed to test the Gallium solar neutrino detectors GALLEX and SAGE, measuring a total number of events smaller than the expected one. We interpret this anomaly as a possible indication of the disappearance of electron neutrinos and, in the effective framework of two-neutrino mixing, we obtain sin² 2Ө > 0. 03 and “delta”m2> 0. LeV2. The compatibility of this result with the data of the Bugey and Chooz reactor antineutrino disappearance experiments is studied. We find that the Bugey data present a hint of neutrino oscillations with 0. 02 < sin² 2Ө < 0. 07 and “delta”m2 =1. 95eV2. Combining the data Gallium, Bugey and Chooz, we find that this hint persists, with an acceptable compatibility of the experimental data. The experimental data of the Gösgen nuclear Reactor experiment are also analyzed, and we obtain upper limits for the mixing parameters, excluding the region with sin² 2Ө > 0. 3 and “delta”m2> 0. 05eV2 at 30- C. L. From the combination of Gösgen, Gallium, Bugey and Chooz data, we find that the hint of neutrino oscillations persists with 0. 03 > sin² 2Ө > 0. 07 and “delta”m2 = 1. 93ey2, with a good compatibility of the data. The no oscillations hypothesis cannot be excluded. We also fit uptodate cosmological data with an extended ACDM model, including light relics with a mass in the range 0. 1-10 eV. We obtain constrains on the current density and velocity dispersion of those relics, and constrains on their mass, assuming that they consist either of early decoupled thermal relics, or of non-resonantly produced sterile neutrinos. We get that at the 3ơ- C. L. , a sterile neutrino with mass ms = 2 eV can be accommodated with the data provided that it is thermally distributed with TsTid v < 0. 8, or is non-resonantly produced with Neff < 0. 5
28
Piteira, Rodolphe. "Recherche d'oscillation de neutrinos dans l'expérience MINOS par l'utilisation des interactions quasi-élastiques." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2005. http://tel.archives-ouvertes.fr/tel-00011451.
Full textAbstract:
L'enthousiasme de la communauté scientifique pour l'étude des oscillationsde neutrinos n'a d'égal que les masses de leurs détecteurs. L'expérience
MINOS détermine et compare les spectres proches et lointains des neutrinos
muoniques du faisceau NuMI, afin de mesurer deux paramètres d'oscillation:
$\Delta m_{23}^2$ et $sin^2(2\theta_{23})$. Les spectres sont obtenus par
l'analyse des interactions par courant chargés dont la difficulté réside
dans l'identification des produits des interactions (e.g. muons). Une
méthode alternative permettant d'identifier les traces de muons courbées par
le champ magnétique des détecteurs, ainsi que de déterminer leurs énergies
est présentée dans ce manuscrit. La sensibilité des détecteurs est optimale
pour les interactions quasi-élastiques dont une méthode de sélection est
proposée, afin d'étudier leur oscillation. Bien que réduisant la
statistique, une telle étude introduit moins d'erreur systématique,
constituant la méthode idéale à long terme.
29
Blennow, Mattias. "Theoretical and Phenomenological Studies of Neutrino Physics." Doctoral thesis, Stockholm : Department of Theoretical Physics, Royal Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4415.
Full text
30
Amanik, Philip. "Effects of non-standard neutrino flavor changing interactions in core collapse supernovae." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3216385.
Full textAbstract:
Thesis (Ph. D.)--University of California, San Diego, 2006.Title from first page of PDF file (viewed September 5, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 87-89).
31
Bartl, Alexander [Verfasser], Achim [Akademischer Betreuer] Schwenk, and Segovia Almudena [Akademischer Betreuer] Arcones. "Neutrino Interactions with Supernova Matter / Alexander Bartl ; Achim Schwenk, Almudena Arcones Segovia." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2016. http://d-nb.info/1117797171/34.
Full text
32
Pickering, Luke. "Measurement of lead-target neutrino interactions using the whole T2K near detector." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/54647.
Full textAbstract:
This thesis presents a selection of neutrino interactions occurring within the Electromagnetic Calorimeters (ECals) of the T2K off-axis near detector, ND280. ND280 is situated 2.5 degrees off axis with respect to the J-PARC neutrino beam and is used to constrain the unoscillated neutrino flux for T2K oscillation analyses. The motivation for an ECal-target sample is three-fold: to investigate the neutrino flux across a wider range of off-axis angles than is possible with the main near-detector target; to measure the rate of muon production with a larger angular acceptance than the standard near detector event samples; and to investigate neutrino interactions on lead, a heavy nuclear target on which there is little published data. To enable this analysis, the ECal vertex reconstruction was integrated with the rest of the ND280 reconstruction software. For the first time, the accurate particle identification (PID) and momentum reconstruction capabilities of the ND280 Tracker are used for particles produced in neutrino interactions in the ECals. PID and kinematic reconstruction is not possible using ECal information alone. Using this newly facilitated reconstruction of ECal-originating final-state particles, distributions of the reconstructed kinematics for a sample of charged-current inclusive muon-neutrino interaction candidates are compared between data and simulation. This highlights that a deficiency in the ND280 simulation of entering background particles constitutes a more significant problem than previously believed. The data--simulation agreement seen is reasonable: the shape-only Chi-Square test statistic for the muon-like sample was evaluated to be 245 for 104 analysis bins. This motivates the further use of the ND280 ECals for constraint of the T2K flux prediction as well as heavy-target, neutrino scattering measurements.
33
Hallsjö, Sven-Patrik. "Charged current quasi-elastic muon neutrino interactions in the Baby MIND detector." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/41123/.
Full textAbstract:
The T2K long-baseline neutrino experiment in Japan is designed to study neutrino oscillations, to determine the mixing angles and mass-squared difference of the neutrino mass eigenstates and, potentially, to discover CP violation in neutrinos by comparing neutrino to antineutrino oscillations. In the near detector complex 280 m downstream of the produc- tion target at the Japanese Particle Accelerator Research Centre (J-PARC), the WAGASCI experiment will measure the ratio of cross sections from neutrinos interacting with a water and scintillator targets, in order to constrain neutrino cross sections essential for the T2K neutrino oscillation measurements. A prototype Magnetised Iron Neutrino Detector, called Baby MIND, has been constructed at CERN and will act as a magnetic spectrometer behind the main WAGASCI target. The Baby MIND spectrometer was installed between February and March 2018 in the near detector complex, behind WAGASCI and is able to measure the charge and momentum of the outgoing muon from neutrino charged current interactions inside the WAGASCI target, to be able to perform full neutrino event reconstruction. Baby MIND collected data in the reverse horn focussed antineutrino beam between April and May 2018. In this thesis, the Baby MIND spectrometer is described in detail along with the performance from initial beam tests performed with the Proton Synchrotron (PS) charged particle beam at the T9 test beam facility at CERN. The test beam was used to perform measurements of track reconstruction efficiency and charge reconstruction efficiency, using dedicated reconstruction programmes, SaRoMaN and SAURON. The software environment used to perform event reconstruction in the complex detector geometry of Baby MIND is described in this thesis. Furthermore, a machine learning multi-variate analysis was used to perform particle identification between muons and hadrons, allowing for a pure selection of muons in the test beam. NuSTORM is a novel type of neutrino beam from the decay of muons in a storage ring. This type of facility produces well defined beams of $\nu_\mu$ and $\bar{\nu_e}$ neutrinos. A study is performed in the thesis to determine the expected sensitivity of mea- suring neutrino interactions in a fully active scintillator neutrino target, with a magnetised iron detector downstream. This analysis also benefited from an identification of the different event types by using a machine learning multi-variate approach. Finally, results are presented on charged current quasi-elastic neutrino and antineutrino interactions in iron reconstructed with the Baby MIND detector during the 2018 neutrino data taking at J-PARC.
34
Bischer, Ingolf Franz [Verfasser], and Werner [Akademischer Betreuer] Rodejohann. "Effective Neutrino Interactions: Origins and Phenomenology / Ingolf Franz Bischer ; Betreuer: Werner Rodejohann." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1236695461/34.
Full text
35
Hansen, Fredrik. "Multidimensional Analysis of Non-Standard Neutrino Interactions Using the Proposed ESSnuSB Experiment." Thesis, KTH, Teoretisk fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175861.
Full text
36
di, Ferdinando Donato <1969>. "Experimental study of neutrino interactions in the opera-like emulsion cloud chambers." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/332/1/PhDthesis.pdf.
Full text
37
di, Ferdinando Donato <1969>. "Experimental study of neutrino interactions in the opera-like emulsion cloud chambers." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/332/.
Full text
38
FORMOZOV, ANDREY. "SEARCH FOR NON-STANDARD NEUTRINO INTERACTIONS WITH LARGE-VOLUME LIQUID SCINTILLATOR DETECTORS." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/646205.
Full textAbstract:
Even though electroweak part of the Standard Model passed decades of testing and precision measurements, there is still a space for the presence of new physics. In particular, the neutrino sector in the last years has been reaching the level of precision oscillometry. However, the current data are not able to exclude many possible extended scenarios, in which new interactions comparable with the standard ones are still possible. This work is dedicated to beyond-Standard-Model interactions of neutrino and electron called Non-Standard Interactions or shortly NSI. Analogously to standard electroweak interactions, NSI could be charged current (CC) and neutral current (NC) type. Usually, in analyses of experiments, NC and CC NSI are considered separately, and I follow this strategy in the course of this work. The global search for NSI involves almost all experimental approaches of neutrino physics and goes far beyond the scope of this work. Here, instead, I look at the problem through the prism of the large-scale liquid scintillator experiments and confine the investigation to the search for NC NSI with solar neutrinos. In addition, I review CC NSI with reactor neutrinos at medium baseline.
As a contribution into upcoming JUNO experiment, I investigate liquid scintillator energy response and radiopurity, which are essential for the successful realization of solar and reactor neutrino physics programs and, therefore, for NC and CC NSI search. I analyze in detail the non-linearity and energy resolution of liquid scintillator. I develop an experimental Compton coincidence technique with High Pure Germanium gamma spectrometer, provide a conservative measurement of the Birks’ ionization quenching constant kB and discuss problems related to its measurement. Throughout the study, I also formulate the optimal characteristics of the experimental apparatus for this improvement. The ultimate goal of this investigation is separating intrinsic energy resolution, which was never yet robustly measured for liquid organic scintillators. The intrinsic energy resolution may have an impact on the energy response of the new generation large liquid scintillator detectors such as JUNO and have to be carefully investigated. Applying single photon counting technique, I perform a calibration of the PMT charge scale and set apart statistical term from the total liquid scintillator energy resolution. Remaining term significantly differs from zero, indicating the presence of additional contribution associated with the intrinsic energy resolution. As an outlook, the precise estimation of the light collection should be conducted in order to ensure that its contribution is not significant to mimic the observed intrinsic resolution effect. The analysis of the radiopurity of the liquid scintillator showed that it is close to the one demanded for reactor neutrino program and CC-NSI search. Still, an improvement of purification procedure is necessary to fulfill solar neutrino program requirements for NC NSI search. Finally, I place the limits to NC NSI parameters for electron and tau neutrino with the Phase II data of Borexino experiment. The limits are quite stringent and compatible with other experiments. The best up-to-date limit to the left electron NSI-parameter is obtained. The allowed regions could be further significantly reduced by incorporating the current result in a global analysis. Besides, the same analysis approach is used to measure the squared sine of the Weinberg angle with a precision comparable with reactor neutrino experiments and place the most robust limit on the probability of ν−ν̄ conversion in the Sun for solar neutrinos with energies Eν < 1.8 MeV. I conclude with deliberation on the applicability of solar neutrino NC NSI approach for current JUNO detector configuration.
39
Yu, Ji-Young. "Neutrino interactions and nuclear effects in oscillation experiments and the nonperturbative dispersive sector in strong (quasi-) Abelian fields." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964757303.
Full text
40
Stassinakis, Argyrios. "A study of the atmospheric neutrino flavour content using the Soudan 2 detector." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388755.
Full text
41
Schuller, Jean-Pierre. "Mesure des sections efficaces totales des réactions (anti)neutrino-nucléon de type courant chargé dans une cible de fer." Paris 11, 1985. http://www.theses.fr/1985PA112337.
Full textAbstract:
Nous décrivons les mesures des sections efficaces totales des interactions neutrino-fer réalisées en 1982-83 avec le détecteur de la collaboration CDHS, placé dans un faisceau de neutrinos au CERN. Nous détaillons la formation du faisceau et les méthodes utilisées pour la mesure des flux de particules incidentes. L’analyse des évènements enregistrés dans l’appareillage a permis de vérifier que la section efficace croît linéairement avec l’énergie des neutrinos incidents. Ce comportement est en accord avec les prédictions du modèle naïf des quarks-partons. Nous avons trouvé pour les pentes : σν /E = (. 693 +̠. 026) 10⁻³⁸ cm²/GeV σν⁻/E = (. 327 +̠. 012) 10⁻³⁸ cm²/GeV pour un domaine d’énergie allant de 10 à 200 GeV. Les erreurs systématiques sont discutées en détail. Enfin, nous comparons nos résultats avec ceux obtenus par d’autres expériencesWe describe the measurements of the total cross section of (anti)neutrino-iron interactions, performed in 1982-83 with the detector of the CDHS collaboration, installed in a neutrino beam at the CERN SPS. We detail the set-up of the beam and the methods used to measure the flux of in-coming particles. The analysis of events recorded in the apparatus has permitted to verify that the total cross sections grow linearly with the energy of incident neutrinos, in agreement with the predictions of the naïve quark-parton model. We have found for the slopes: σν /E = (. 693 +̠. 026) 10⁻³⁸ cm²/GeV σν⁻/E = (. 327 +̠. 012) 10⁻³⁸ cm²/GeV in the energy ranges 10-200 GeV. The systematical errors are discussed in detail. Finally, we compare our results with those obtained in other experiments
42
Reichenbacher, Jürgen [Verfasser]. "Final KARMEN results on neutrino oscillations and neutrino-nucleus interactions in the energy regime of supernovae / Forschungszentrum Karlsruhe GmbH, Karlsruhe. Jürgen Reichenbacher." Karlsruhe : FZKA, 2005. http://d-nb.info/976568330/34.
Full text
43
Scott, Mark Andrew. "Measuring charged current neutrino interactions in the electromagnetic calorimeters of the ND280 detector." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/12895.
Full textAbstract:
This thesis presents a study of neutrino interactions within the electromagnetic calorimeters (ECals) of the Tokai-to-Kamioka (T2K) off -axis near detector (ND280), using data collected from T2K Run II and Run III. Neutrino oscillation physics is a rapidly advancing field, with the recent discovery of non-zero [Symbol appears here. To view, please open pdf attachment]13 allowing the possibility of measuring CP-violation in the lepton sector. The current neutrino beam experiments must make precise measurements of the oscillation parameters and to do this require an improved understanding of neutrino interactions, which can only come through better measurements of neutrino cross-sections. This thesis describes the development of a neutrino event selection using a boosted decision tree multi-variate analysis to separate interactions within the ND280 ECals from entering backgrounds. This is then used to provide a selection of neutrino event samples from each ECal module, which are inputs to a X2 fit that is used to extract the [Symbols appears here. To view, please open pdf attachment] charged current inclusive cross-section, which was found to be [Mathematical equation appears here. To view, please open pdf attachment].
44
Norrick, Anne. "A Measurement of Nuclear Effects in Deep Inelastic Scattering in Neutrino-Nucleus Interactions." W&M ScholarWorks, 2018. https://scholarworks.wm.edu/etd/1550153893.
Full textAbstract:
Neutrino-Nucleus Deep Inelastic Scattering (DIS) events provide a probe into the structure of nucleons within a nucleus that cannot be accessed via charged lepton-nucleus interactions. The MINERvA experiment is stationed in the Neutrinos from the Main Injector (NuMI) beam line at Fermi National Accelerator Laboratory. With the recent increase in average neutrino energy and the greatly increased intensity of the NuMI beam line, projected sensitivities for DIS cross section ratio analyses using MINERvA's suite of nuclear targets (C, CH, Fe and Pb) are greatly increased. an analysis of theMINERvA DIS data on carbon, iron, lead, and plastic has been conducted for muon neutrino interactions with a muon angle less than 17 degrees. Results are presented as a differential cross section with respect to neutrino energy and the Bjorken-x scaling variable.
45
Stellacci, Simona Maria. "Study of the hadronic current in the neutrino interactions of the OPERA experiment." Doctoral thesis, Universita degli studi di Salerno, 2013. http://hdl.handle.net/10556/1179.
Full textAbstract:
2011 - 2012The OPERA experiment was designed to observe the appearance of the vr in a pure beam ofvll (CNGS). The evidence ofthe appearance signal is provided by the detection of the daughter particles produced in the decay of charged lepton T. The hadronic decay channel has the largest branching ratio; in order to proficient1y use it for neutrino oscillation detection, one needs a good knowledge ofthe hadronic current in the OPERA experimental setup. The present work shows the data-acquisition and the comparative analysis of a "minimum-bias" sample of interactions to the standard simulation used in OPERA. The first chapter of this thesis work is an overview of neutrino physics; in the final part of the chapter some neutrino experiments are described. The second chapter focuses on the OPERA detector. The main components of the detector are explained as well as the physical performance of the experiment. Data-taking is the subject of the third chapter; the scanning procedure is shown, followed by the technique used to estimate the momentum of particles in the ECC. Finally, the fourth chapter presents the data analysis. [edited by author]
XI n.s.
46
Bechet, Sabrina. "Recherche d'un flux diffus de neutrinos tauiques d'origine cosmique dans le détecteur IceCube." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209628.
Full textAbstract:
Le détecteur IceCube est constitué d'un réseau de modules optiques digitaux (DOMs) déployés sur un volume d'1 km³ dans la glace antarctique. Les DOMs enregistrent la lumière Cerenkov émise par les particules secondaires issues des interactions des neutrinos avec la glace. Selon la répartition géographique des signaux lumineux dans la glace, on peut différencier les différentes saveurs de leptons et ainsi identifier la saveur du neutrino primaire. Les modèles astrophysiques prédisent une production dominante de neutrinos électroniques et muoniques au sein d'accélérateurs cosmiques. Cependant, lors de leur propagation dans l'univers, ces neutrinos oscillent et on s'attend à observer sur Terre le même flux des trois saveurs de neutrinos. Comme la production de neutrinos tauiques dans l'atmosphère est négligeable, ce canal est affecté d'un bruit de fond intrinsèque quasi nul.Ce travail porte sur la détection de neutrinos tauiques d'origine cosmique. A haute énergie (E>PeV), le lepton tau, produit par le neutrino tauique, se propage sur une centaine de mètres avant de se désintégrer. Nous optimisons notre recherche pour le canal de désintégration muonique qui, s'il se produit dans le volume de détection, présente une signature unique. En effet, les différences de masse du tau et du muon induisent des différences quant à leur processus de perte d'énergie qui mènent à une différence de luminosité le long des traces du tau et du muon.
Nous avons développé une observable originale reposant sur les charges enregistrées par les différents DOMs pour caractériser la luminosité le long d'une trace afin de différencier les traces de muons de celles de taus se désintégrant en muon .Cependant, au niveau de déclenchement du détecteur, on est confronté à un bruit de fond de muons atmosphèriques un million de fois supérieur au signal. Nous avons donc mis en place une série de coupures afin de réduire ce bruit de fond et ainsi augmenter la pureté de notre échantillon.
Enfin l'application de ces coupures sur un échantillon de données réelles enregistrées durant la saison 2009-2010 et l'absence de signal détecté permettent de poser une limite supérieure sur le flux de neutrinos tauiques. Ceci constitue la première limite expérimentale pour des neutrinos tauiques d'énergies inférieures à 20 PeV.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
47
Chatelain, Amélie. "Neutrino propagation in dense astrophysical environnements : beyond the standard frameworks." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC224.
Full textAbstract:
Depuis la découverte des oscillations de neutrinos dans le vide, il a été démontré que la présence d'un environnement de matière peut avoir une grande influence sur les changements de saveurs. L'inclusion des termes d'interactions neutrino-neutrino dans les études des conversions de saveurs dans les environnements astrophysiques denses a créé une activité théorique très intense. Cette thèse entre dans ce cadre en allant au-delà des approches usuelles. Dans notre premier projet, nous explorons analytiquement et numériquement le rôle de la cohérence d'hélicité, en nous basant pour la première fois sur une simulation astrophysique détaillée d'un rémanent de fusion de système binaire d'étoiles à neutrons. Cette étude montre que la cohérence d'hélicité n'engendre pas de conversions, et par ce fait, renforce la validité des équations de champs moyens habituellement utilisées dans les milieux denses. Elle apporte également une meilleure compréhension du mécanisme de nonlinear feedback. Après cela, nous examinons dans une seconde partie le rôle des interactions non-standards entre matière et neutrinos dans le même contexte astrophysique. Nous trouvons que la présence de telles interactions peut créer une nouvelle résonance de type MSW, appelée la résonance "inner", qui peut avoir un couplage intéressant avec la résonance matière-neutrino, et provoque des conversions de saveurs très proches de l'objet central. Nous analysons également le mécanisme d'une telle résonance, et montrons qu'elle se manifeste comme une résonance synchronisée en présence d'un potentiel d'interaction neutrino-neutrino fort. Enfin, notre dernière étude est plus formelle et se focalise sur la question fondamentale de la décohérence par séparation de paquets d'ondes en présence de champs gravitationnels forts. Nous utilisons le formalisme de la matrice densité pour le paquet d'onde du neutrino dans la métrique de Schwarzschild, et dérivons l'expression de la longueur de cohérence. Ce travail constitue la toute première étude dans la description de la décohérence en espace-temps courbeSince the discovery of neutrino oscillations in vacuum, it has been shown that the presence of a matter background can greatly modify the flavor evolution. The inclusion of neutrino self-interactions in the studies of neutrino flavor conversions in dense astrophysical environments has triggered an intense theoretical activity. This thesis enters into this context by going beyond usual approaches. In our first project, we explore analytically and numerically the so-called helicity coherence, using for the first time a detailed astrophysical simulation of binary neutron star merger remnants. This study shows that helicity coherence cannot lead to conversions and, by doing so, strengthens the validity of the usually-employed mean-field equations in dense media. It also brought a better understanding of the nonlinear feedback mechanism. Having done so, we examine in a second part the role of nonstandard matter-neutrino interactions in the same astrophysical setting. We find that the presence of such interactions creates another MSW-like resonance, called the inner resonance, which can have an interesting interplay with the matter-neutrino resonance, and leads to flavor conversions very close to the central object. We also analyze the mechanism of such a resonance and show that it can be met as a synchronized resonance in the presence of a strong self-interaction potential. Finally, our last study is more formal, as it focuses on the fundamental question of decoherence by wave-packet separation in the presence of strong gravitational fields. We use the density matrix formalism for the neutrino wave packet in the Schwarzschild metric and derive the expression of the coherence length. This work provides with the first study in the description of decoherence in curved space-time
48
Héritier, Carole. "Identification et localisation des événements neutrino dans le détecteur OPERA." Phd thesis, Université Claude Bernard - Lyon I, 2004. http://tel.archives-ouvertes.fr/tel-00009860.
Full textAbstract:
OPERA est une expérience destinée à démontrer que le phénomène d'oscillation des neutrinos est à l'origine des neutrinos atmosphériques (transition $\nu_\mu \to \nu_\tau$ et recherche de l'angle de mélange $\nu_\mu \to \nu_e$). Pour prouver l'apparition des à 732 km du CERN, un détecteur hybride est en cours d'installation dans le souterrain du Gran Sasso. La cible, faite de briques de 8kg composées de feuilles de plomb et d'émulsions photographiques, permet l'observation directe de la désintégration du lepton $\tau$ produit lors des interactions $\nu_\tau$ en courant chargé (CC). La reconstruction des traces, la localisation des interactions neutrino dans la cible ainsi que l'identification du muon sont possibles par des trajectographes placés à l'intérieur de la cible (plans de scintillateurs) et dans le spectromètre qui la suit (détecteurs RPC). Cette thèse est centrée sur le développement des algorithmes nécessaires pour l'identification et la localisation des interactions neutrino dans la cible d'OPERA. Ces algorithmes sont basés sur une approche globale de l'utilisation des détecteurs électroniques. Une classification des événements neutrino est mise en place à partir du muon produit lors des interactions $\nu_\tau$ CC avec désintégration du tau en muon. Elle est optimisée par la reconstruction de traces et par la prise en compte de critères topologiques et calorimétriques reflétant la nature de l'interaction (quasi-élastique, profondément inélastique) ; la logique de localisation de la brique d'interaction est alors adaptée à chaque catégorie. Une carte tridimensionnelle de probabilités de briques est obtenue et donne ainsi la possibilité d'élaborer différentes stratégies d'extraction de briques. Dans cette continuité de ce travail, une étude de faisabilité d'un test sur faisceau appelé OPERETTE a été réalisée. Le projet consistait à installer un détecteur similaire à celui d'OPERA sur un faisceau de neutrinos dans la zone Nord du CERN. OPERA aurait ainsi disposé d'un lot d'événements neutrino avant son démarrage lui permettant de tester les différentes techniques d'analyse.
49
Quilain, Benjamin. "Measurement of the muon neutrino cross section through charged-current interactions and search for Lorentz invariance violation at the T2K experiment : neutrino oscillation." Palaiseau, Ecole polytechnique, 2014. http://www.theses.fr/2014EPXX0071.
Full textAbstract:
L'expérience T2K, située au Japon, est une expérience étudiant l'oscillation des neutrinos à longue distance. Elle vise à mesurer les paramètres décrivant ce phénomène d'oscillations quantiques, et plus particulièrement, l'angle de mélange θ13. Ce dernier est mesuré par la production de neutrinos muons à J-PARC et la détection de neutrinos électroniques 295 km plus loin, dans le détecteur Super-Kamiokande. Etant donné que T2K a mesuré un angle de mélange θ13 ≠ 0 à plus de 7σ de confiance, cela ouvre la possibilité de mesurer la phase de violation CP dans les expériences d'oscillation de neutrino. Par la mesure précise des paramètres d'oscillations, T2K a pour but d'apporter les premières contraintes sur l'existence possible d'une phase de violation CP dans le secteur leptonique. Après avoir introduit la théorie d'oscillation des neutrinos ainsi que l'expérience, nous présentons le Générateur de Cone, un dispositif que nous avons développé afin de calibrer le détecteur lointain Super-Kamiokande. Nous étudions ensuite l'uniformité et l'isotropie de ce dernier, avant de mettre en évidence les différentes sources de désaccord entre les données et la simulation du détecteur. Nous montrons en particulier une imperfection dans la simulation de la réflexion de la lumière sur le mur du détecteur. Par la suite, nous présentons la calibration du dépot de charge que nous avons effectuée pour les détecteurs proches et sur axe, INGRID et le Module Proton. En particulier, nous observons un phénomène de diaphonie optique entre des scintillateurs d'un certain type, que nous avons corrigé. Cette calibration est ensuite utilisée pour effectuer la première mesure de section efficace double différentielle des interactions (CC0π) des neutrinos avec le Module Proton. L'incertitude provenant des sections efficaces est l'une des sources principales d'erreurs sur la mesure des oscillations de neutrinos, et le canal CC0π est le canal principal d'interaction des neutrinos dans l'expérience T2K. Nous montrons que notre mesure est en accord avec les mesures récentes de l'expérience MiniBooNE. Enfin, nous présentons la première recherche de signaux de violation de l'invariance de Lorentz dans l'expérience T2K. Nous montrons que les oscillations de neutrinos constituent l'une des sondes les plus sensibles pour ce phénomène. Nous dévoilerons d'abord les raisons de la recherche d'un tel effet, avant de présenter notre résultat de recherche de violation d'invariance de Lorentz qui utilise le détecteur INGRID nouvellement calibré. Nous montrons qu'aucun effet de cette violation n'est observé dans ce détecteur proche de T2K.
50
Towers, S. J. "A measurement of the neutral current chiral couplings in neutrino and antineutrino proton interactions." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355817.
Full text