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Dissertations / Theses on the topic 'MUONIUM'

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Published: 4 June 2021
Last updated: 13 February 2022

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1

Fry, Charles Alan. "Measurement of the Lamb shift in muonium." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25785.

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This thesis describes the first measurement of the Lamb shift in n=2 muonium. The muonium atom is a hydrogen-like bound state of two leptons (µ⁺e⁻), both of which are believed to be point-like particles. The point-like nature of the constituent particles simplifies and reduces the uncertainty of the application of quantum electrodynamics (QED) to the calculation of the Lamb shift in the muonium atom. Measurements of the Lamb shift in hydrogen disagree with the predictions of theory by a few standard deviations; however, theoretical predictions also disagree with each other, partly because of d
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2

Spencer, David Philip. "Muonium in some insulating oxides and diamond." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25972.

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Muonium can be regarded as an isotopic analogue of the hydrogen atom, with a positive muon replacing the proton. This thesis is concerned with searches for muonium in weak transverse and zero magnetic fields in a variety of non-magnetic oxide insulators with few nuclear moments, and in diamond, a semiconductor. The technique of Muon Spin Rotation (µSR) was used, which can be thought of in analogy with NMR and EPR. It relies on measuring the direction of the muon spin with time via the unique signature of the parity violating decay of the muon, in which its decay positron is emitted preferentia
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3

Morris, Gerald D. "Muonium formation and diffusion in cryocrystals." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq27205.pdf.

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4

Barnabas, Mary Vijayarani. "Reactions of muonium and positronium in solution." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29007.

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Positive muons are produced at TRIUMF as pion decay products and form muo-nium atoms in media such as water during their two microsecond lifetime. Muo-nium is a hydrogen-like atom with virtually the same Bohr radius and ionization energy as ¹H, ²H and ³H, but with a mass one-ninth that of ¹H. Its reactions toward solutes are studied by μSR (the muon spin rotation technique) and the muonated free radicals it forms are studied by μLCR (muon level crossing resonance spectroscopy). In this thesis, rate constants for muonium reactions were determined for a range of solutes from simple amides to DN
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5

Harshman, Dale Richard. "The interactions of muonium with silica surfaces." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/27108.

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The behavior of muonium on the surface of fine (35 Å mean radius) SiO₂ powders has been studied using the techniques of muon spin rotation (μSR). Results indicate diffusion and trapping behavior of the muonium atoms on the silica surface, which is strongly influenced by the concentration of surface hydroxyl groups. Specifically, the presence of the surface hydroxyl groups has been shown to inhibit the motion of muonium on the silica surface. These studies have also provided information regarding the origin of the relaxation of the muon spin polarization for muonium on the silica surface. Spec
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6

Tempelmann, Alexandra. "Reaction kinetics of muonium with hydrogen bromide." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30385.

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The rate constants of the abstraction reaction Mu + HBr —• MuH + Br were measured using the well established μSR technique at TRIUMF. Measurements were made at various temperatures between 170 and 480 K, and fit to the Arrhenius equation both with and without an additional T½ dependence. The rate constants obtained were k(T) = (5.101 ± 0.106) x 10⁻¹¹ exp{-(0.560 ± 0.110) kcal mol⁻¹/RT} and k(T) = (0.183 ± 0.005) x 10⁻¹¹T½exp{-(0.286± 0.014) kcal mol⁻¹/RT} cm³ molecule⁻¹ s⁻¹. The low activation energy for such an exothermic reaction indicates that the barrier on the Mu + HBr surface is early. K
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7

Yen, Hon Kit. "Theoretical spin dynamics on muonium level-crossing resonance." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28531.

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Redfield's theory and the theory of master equations have been reviewed and their applications to muonium spin dynamics discussed. It was found that both theories are equivalent in the Markov limit. In some cases, analytical expressions for relaxation rates are found. In addition, Redfield's theory was applied to describe spin relaxation of muonium-substituted free radicals near level-crossing resonances. Theoretical predictions were compared with experimental data for the C₆F₆-Mu radical and the results suggest there are several relaxation mechanisms involved.<br>Science, Faculty of<br>Physi
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8

Hubbard, Penny Louise. "Molecular and electron dynamics with muon spectroscopy." Thesis, University of East Anglia, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268573.

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9

Bakule, Pavel. "A solid state laser system for Doppler-free spectroscopy of muonium." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365885.

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10

Kerridge, Andrew. "Quantum behaviour of hydrogen and muonium in solid-state and biological systems." Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1446780/.

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For hydrogen-like nuclei (HLN) such as the proton or muon, the quantum zero point energy cannot be ignored. The main objectives of this thesis were to identify practical ways to model this quantatively, and hence i) to gain an understanding of interactions between the HLN and its environment, and ii) to use this understanding to evaluate the wavefunction of such a nucleus within an electronic structure calculation. Several features of the HLN-electron interactions were studied analytically by assuming their interaction to be harmonic in nature. It was shown that the accurate modelling of the H
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11

Cornish, Simon Lee. "A solid state laser system for high resolution spectroscopy of the 1S-2S transition in muonium." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297937.

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12

Liu, Yi-Wei. "Optical studies using tunable solid state lasers." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299523.

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13

Souiri, Moncef. "Correlation entre les paramètres de résonance paramagnétique et de la liaison chimique ions des métaux de transition et muonium /." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37601312f.

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14

Souiri, Moncef. "Correlation entre les parametres de resonance paramagnetiques et de la liaison chimique : ions des metaux de transition et muonium." Strasbourg 1, 1986. http://www.theses.fr/1987STR13213.

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Recherche de relations entre parametres de l'hamiltonien de spin en rpe de defauts ponctuels (decomposition par le champ cristallin, constante de couplage hyperfin) et les parametres de la liaison chimique du reseau hote (ionicite, electronegativites de l'anion et du cation, longueur de liaison). Bonne correlation dans le cas de l'ionicite et de l'electronegativite de l'anion; absence de correlation avec la longueur de liaison, explicable par une relaxation locale, et mise en evidence dans les matrices ternaires. Application de l'analyse au muonium: la constante de couplage hyperfin est correl
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15

Dupays, Arnaud. "Transfert de charge muonique." Phd thesis, Université Paul Sabatier - Toulouse III, 2004. http://tel.archives-ouvertes.fr/tel-00006442.

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Cette thèse traite du transfert du muon entre l'hydrogène muonique et d'autres atomes et molécules. Récemment, Adamczak et al. ont proposé une méthode de mesure de la structure hyperfine de l'état fondamental de l'hydrogène muonique basée sur la dépendance énergétique du taux de transfert muonique sur l'oxygène. Réalisées dans les années 90 au Paul Scherrer Institut, des expériences ont en effet indiqué que le taux de transfert sur l'oxygène semblait augmenter d'un facteur 4 entre des énergies de collision thermiques (0.04 eV) et épithermiques (0.12 eV). Nos calculs avaient pour première motiv
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16

Komu, T. (Teresa). "Retoriikkaa vai sosiaalista kestävyyttä?:poronhoitoyhteisöjen osallistaminen kaivostoiminnan suunnitteluprosesseissa Muonion Lapinkylässä ja Muonion paliskunnassa 2011–2012." Master's thesis, University of Oulu, 2013. http://urn.fi/URN:NBN:fi:oulu-201304251209.

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Tutkimuksen aiheena on poronhoitoyhteisöjen osallistaminen kaivostoiminnan suunnitteluprosesseissa. Tutkimuskohteena on kansainvälisen kaivosyhtiön Ruotsin Pajalaan ja Suomen Kolariin suunnittelema hankekokonaisuus. Hankkeet sijoittuvat Muonion lapinkylän ja Muonion paliskunnan laidunmaille. Suomessa on parasta aikaa vireillä useita kaivosprojekteja, joista valtaosa sijoittuu poronhoitoalueelle. Sekä kaivosalalla että poronhoitoyhteisöillä on tarve saada tietoa kyseisten elinkeinojen yhteensovittamisesta. Tutkimusta varten haastateltiin osallistamisprosessissa keskeisessä roolissa olevia poro
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17

Rusjan, Edmond. "Transport of muonic atoms." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/81032.

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Transport of muonic hydrogen and deuterium atoms in gaseous hydrogen and deuterium is studied in the diffusion approximation and by means of the multiple collision expansion. The diffusion coefficient is derived. Scattering kernels are computed from the kinematics of an inelastic binary collision. The effect of rotations of the target molecules is treated by defining and computing an effective inelastic energy transfer Q<sub>eff</sub>. The Doppler effect is taken into account by averaging the cross sections over the Maxwellian velocity distribution of the target molecules. Numerical results of
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18

Tolonen, S. (Siiri). "Uhraamisen sijoittuminen seidoilla:geokemiallisia ja -fysikaalisia havaintoja ja tilallista tulkintaa Enontekiön Näkkälän, Utsjoen Sieiddakeädgin, Muonion Kirkkopahdan ja Muonion Porviniemen seitakohteilta." Master's thesis, University of Oulu, 2013. http://urn.fi/URN:NBN:fi:oulu-201305131227.

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Tutkielma käsittelee uhraamisen sijoittumista seidoilla. Aineistona on neljältä seidalta, Enontekiön Näkkälästä, Utsjoen Sieiddakeädgiltä, Muonion Kirkkopahdalta ja Muonion Porviniemeltä, kerätyt maaperänäytteet. Tutkimuksessa selvitetään, onko kohteilla uhrattu, ja mihin uhrit on asetettu. Lisäksi pohditaan, miksi uhraaminen näyttää sijoittuvan kohteiden tietyille alueille, ja onko kohteiden välillä havaittavissa samankaltaisuuksia vai eroja. Näytteistä analysoidaan fosforipitoisuus sitruunahappomenetelmällä, magneettinen suskeptibiliteetti ennen ja jälkeen näytteiden polton, pH sekä orgaanis
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19

Nebel, Tobias. "The Lamb Shift in Muonic Hydrogen." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-120947.

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20

Antognini, Aldo. "The Lamb Shift Experiment in Muonic Hydrogen." Diss., lmu, 2005. http://nbn-resolving.de/urn:nbn:de:bvb:19-50441.

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21

Viel, David William. "Muon transfer from muonic deuterium to carbon." W&M ScholarWorks, 1994. https://scholarworks.wm.edu/etd/1539623853.

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Negative muons were brought to rest in a gas mixture of 30 torr CH$\sb4$ and 570 torr D$\sb2$, using the cyclotron trap at PSI. The muons formed muonic deuterium atoms which diffused through the mixture and transferred their muons to the carbon of the CH$\sb4$ molecules. A planar germanium detector and a silicon detector were used to observe x-rays from the initial muon cascade in the deuterium, and from subsequent cascade in the muonic carbon after transfer. A transfer rate of (4.5 $\pm$ 1.8) $\times$ 10$\sp{10}$/sec was found which agrees well with a previous result measured at 50 bar of (5.
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22

Bach, Bernard Wilhelm. "Search for metastability of 2S muonic neon." W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539623869.

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An experiment was performed at the Paul Scherrer Institut (PSI) to establish the conditions for the metastability of the 2S-state of muonic neon. The muonic atoms were formed by stopping negative muons in the neon-filled target chamber of the PSI cyclotron trap. A pair of intrinsic germanium detectors were used in coincidence to search for the two photon decay of the 2S-state. Both energy and time information from two photon events were written to disk for off-line analysis. Data were accumulated for neon pressures of 40 and 400 Torr. The data were then searched for evidence of two photon tran
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23

Lunerti, Leonardo. "Misura di efficienza del trigger muonico dell'esperimento CMS a LHC." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14093/.

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In questo lavoro è stata studiata l'efficienza del trigger muonico dell'esprimento CMS (Compact Muon Solenoid) a LHC (Large Hadron Collider ), e, per la realizzazione di questo lavoro, è stato sviluppato un programma in C++ che sfrutta il pacchetto software di analisi dati ROOT. La misura dell'efficienza è stata ottenuta con il metodo detto del data-set ortogonale, utilizzando i dati raccolti nel 2016. I risultati sono stati trovati in accordo con quelle provenienti da misure dell'efficienza realizzate con il metodo del Tag & Probe.
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24

Clark, Jessica Higgins Deseret. "The ortho to para transition in muonic molecular hydrogen." W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539623408.

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A precise measurement of the induced weak pseudoscalar coupling constant of the proton, gp, is of interest as a basic test of chiral symmetry breaking. This is the least well-known weak form factor of the nucleon. Muon capture experiments [Jonkmans et al., Phys. Rev. Lett. 77(1996)4512] have been used to measure gp. However, the interpretation of these muon capture experiments requires knowledge of the relative population of the muonic atomic and molecular states for muons in liquid hydrogen. In particular, lambda op, the transition rate between the ortho- and para-molecular states of the pmup
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25

Kraiman, James Brian. "The diffusion of muonic deuterium atoms in deuterium gas." W&M ScholarWorks, 1989. https://scholarworks.wm.edu/etd/1539623780.

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Negative muons were brought to rest in a target array consisting of 30-50 parallel plastic foils coated with Au which were separated by a few mm. The interstitial volumes between the foils were filled with deuterium gas at pressures from 0.094 bar to 1.52 bar. Muons which stopped in the deuterium formed {dollar}\mu{dollar}d atoms, which subsequently diffused through the gas until either the muon decayed or the {dollar}\mu{dollar}d atom struck a foil surface. For {dollar}\mu{dollar}d atoms impinging upon the Au layer, the muon would transfer to an Au atom, resulting in the formation of a {dolla
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26

Chen, Guo Fu. "The diffusion of muonic hydrogen atoms in hydrogen gas." W&M ScholarWorks, 1990. https://scholarworks.wm.edu/etd/1539623790.

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This experiment measured the time distribution of muonic hydrogen atoms which were formed when negative muons were brought to rest in H{dollar}\sb2{dollar} gas, containing Au target foils, at five pressures (750 mbar, 375 mbar, 188 mbar, 94 mbar and 47 mbar at 4.6 mm foil spacing). A Monte Carlo method is applied for deducing the initial velocity distribution, and preliminary results are obtained. The initial velocity distribution of {dollar}\mu{dollar}H atoms is reasonably well described as a 'Maxwellian' velocity distribution with a mean energy E = 3.4 eV. The corresponding muon mean capture
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27

Filosa, Christopher. "Tomographie muonique : du développement de détecteurs à la résolution du problème inverse." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS506.

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Cette thèse porte sur le développement des détecteurs gazeux Micromegas pour la tomographie muonique. Cette technique permet d’utiliser les muons cosmiques issus des interactions entre des rayons cosmiques et l’atmosphère, afin d’imager des objets de grandes dimensions et de grande opacité tels que des bâtiments, des dalles de béton, des volcans ou encore des pyramides comme la pyramide de Khéops en Égypte. En étudiant l’atténuation du flux de muons à travers un objet, nous pouvons obtenir des informations sur sa structure interne. Pour imager de telles structures et détecter les muons qui les
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28

Prado, Raul Ribeiro. "Experimental studies of the muonic component of extensive air showers." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-21062018-150629/.

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Ultra-High Energy Cosmic Rays (UHECR) can only be measured by the detection of Extensive Air Showers (EAS) created by the interaction of the cosmic ray particle with an atmospheric nuclei. The inference of some of the properties of UHECR, like their mass composition, is only possible by the comparison of measurements of EAS observables to predictions from Monte Carlo simulations. The most important source of uncertainties on the description of EAS by the simulations is the modeling of hadronic interactions. For many years it has been known that the hadronic interaction models fail on predictin
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29

Bouteille, Simon. "Développement et applications de détecteurs gazeux à micro-pistes pour la tomographie muonique." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS210/document.

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Cette thèse décrit les premiers essais de tomographie muonique par absorption et par déviation en utilisant des détecteurs Micromegas à haute granularité. Cette technique d'imagerie utilisant les rayons cosmiques gratuits, sans dangers et disponibles partout a démontré sa capacité à imager des objets de tailles variées. Afin de construire des outils compacts, précis, et portables, utiliser une voie d'électronique pour lire chaque motif de lecture est impossible. Pour éviter ce problème, des détecteurs multiplexés ont été conçus, testés et mis en situation dans différentes conditions. Il a été
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30

Lewis, David M. "A theoretical study of the autoionization of the muonic quasi-molecule." Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291971.

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31

Ziat, Djamel. "Étude de systèmes magnétiques par rotations de spins de muons et chaleur spécifique." Mémoire, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/10159.

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Ce manuscrit décrit les projets de recherche qui ont porté sur l’étude de deux familles de matériaux magnétiques frustrés. La première partie traite de la réalisation d’expériences de chaleur spécifique sur le pyrochlore Sm2Ti2O7. Ces expériences ont eu lieu dans un réfrigérateur à dilution 3He-4He, à l’Université de Sherbrooke, dont le fonctionnement est décrit en amont. Ces expériences ont notamment permis l’étude de ce matériau aux températures inédites de 160 mK, où une transition magnétique du second ordre a été mise en évidence. La deuxième partie de ce mémoire porte sur l’ét
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32

Diepold, Marc [Verfasser], and Theodor W. [Akademischer Betreuer] Hänsch. "The Lamb shift in muonic Helium ions / Marc Diepold ; Betreuer: Theodor W. Hänsch." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2015. http://d-nb.info/1122435770/34.

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33

Stocki, Trevor J. "Measurement of muonic hyperfine transition rates and muon capture yields in light nuclei." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0024/NQ38983.pdf.

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34

Fujiwara, Makoto C. "Time-of-flight studies of muon catalyzed fusion with a muonic tritium beam." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0008/NQ38888.pdf.

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35

Williams, Grayson L. "W Boson Charge Asymmetry in the Muonic Decay Channel at the CMS Experiment." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1321594806.

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36

Zhu, Jianhui. "W boson measurement in the muonic decay channel at forward rapidity with ALICE." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2017. http://www.theses.fr/2017IMTA0014/document.

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La haute densité d’énergie atteinte au Large Hadron Collider (LHC) au CERN permet une production abondante de sondes dures, telles que quarkonia, jets à haute impulsion transverse (p<sub>T</sub>) et bosons vecteurs (W, Z), qui sont produits lors de la collision partonique initiale. Les bosons vecteur se désintègrent avant la formation du Plasma de Quark et de Gluons (PQG), une phase déconfinée de la matière, qui peut être produite lors de collisions d’ions lourds ultra-relativistes. Les leptons issus de la désintégration des bosons électrofaibles ne sont pas sensibles à l’interaction forte ave
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37

Senosi, Kgotlaesele Johnson. "Production of W± bosons in the semi-muonic channel at forward rapidity in ALICE." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/6649.

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38

Facchini, Leonardo. "Misure di tempo di volo di muoni con l'elettronica dell'esperimento FOOT." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19396/.

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L'esperimento FOOT (FragmentatiOn On Target) nasce con lo scopo di misurare la sezione d'urto differenziale per processi di frammentazione nucleare per potere descrivere con precisione l'interazione tra i fasci di ioni impiegati in adroterapia e i tessuti del paziente. Una misura necessaria per calcolare le sezioni d'urto e il tempo di volo dei frammenti. In laboratorio è stato ricreato un setup sperimentale attraverso l'utilizzo di tre scintillatori e del sistema di acquisizione dell'esperimento FOOT. Le particelle rivelate sono muoni di origine cosmica. Il tempo di volo dei muoni è ottenuto
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39

Guerin, F. "Sonde muonique et instrumentation associée pour l'étude du plasma de quarks et de gluons dans l'expérience ALICE." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2006. http://tel.archives-ouvertes.fr/tel-00132781.

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ALICE est le détecteur du LHC dédié à l'étude des collisions d'ions lourds ultra-relativistes. Le principal objectif de cette expérience est la mise en évidence et l'étude d'une nouvelle phase de la matière nucléaire prédite par la théorie de la chromodynamique quantique (QCD) : le Plasma de Quarks et de Gluons (PQG). Une des signatures possibles est la suppression des taux de production des quarkonia par écrantage de couleur dans les collisions d'ions lourds, dans lesquelles la formation d'un plasma est attendue. Le spectromètre à muons permettra de mesurer les taux de production des quarkoni
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40

Tran, Ngoc Tiem. "Recherche des oscillations de neutrinos par apparition du τ avec désintégration muonique du vτ dans l'expérience OPERA". Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00534753.

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La physique des oscillations de neutrinos occupe une place majeure dans les études s'intéressant à cetteparticule. Le mécanisme des oscillations, basé sur un changement d'état de saveur d'un neutrino durant sapropagation, permet d'élucider les déficits observés de neutrinos solaires et atmosphériques et apporte des indicationsintéressantes de physique au delà du Modèle Standard par l'étude des angles de mélanges et du schéma de masse desneutrinos.OPERA est un détecteur hybride combinant à la fois latechnique d'une détection électronique en temps réel et la technique de la chambre à brouillard
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Tran, Ngoc Tiem. "Recherche des oscillations de neutrinos par apparition du τ avec désintégration muonique du vτ dans l’expérience OPERA". Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10203/document.

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La physique des oscillations de neutrinos occupe une place majeure dans les études s’intéressant à cetteparticule. Le mécanisme des oscillations, basé sur un changement d’état de saveur d’un neutrino durant sapropagation, permet d’élucider les déficits observés de neutrinos solaires et atmosphériques et apporte des indicationsintéressantes de physique au delà du Modèle Standard par l'étude des angles de mélanges et du schéma de masse desneutrinos.OPERA est un détecteur hybride combinant à la fois latechnique d'une détection électronique en temps réel et la technique de la chambre à brouillard
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42

Guérin, Fabien. "Sonde muonique et instrumentation associée pour l'étude du plasma de quarks et de gluons dans l'expérience ALICE." Clermont-Ferrand 2, 2006. http://195.221.120.247/simclient/consultation/binaries/stream.asp?INSTANCE=UCFRSIM&eidmpa=DOCUMENTS_THESES_215.

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ALICE est le détecteur du LHC dédié à l'étude des collisions d'ions lourds ultra-relativistes. Le principal objectif de cette expérience est l'étude d'une nouvelle phase de la matière nucléaire : le plasma de Quarks et de Gluons (PQG). Le spectromètre à muons d'ALICE permettra de mesurer les taux de production des quarkonia (J/psi, signe) dans les collisions d'ions lourds via leur canal de désintégration dimuonique. Le système de déclenchement rapide du spectromètre à muons est chargé de sélectionner les événements contenant au minimum un muon ou un dimuon. L'étude des performances du système
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43

Freund, Kai Lorenz [Verfasser], and Peter [Akademischer Betreuer] Grabmayr. "Muonic Background in the GERDA Neutrinoless Double-Beta Experiment / Kai Lorenz Freund ; Betreuer: Peter Grabmayr." Tübingen : Universitätsbibliothek Tübingen, 2014. http://d-nb.info/1163237019/34.

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44

Barbano, Eleonora. "Studio della risoluzione in impulso dei muoni nel Near Detector di DUNE." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19392/.

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Lo studio delle proprietà del neutrino ha conseguito notevoli risultati negli ultimi decenni, tuttavia esistono domande alle quali, al momento, non si è in grado di dare una risposta. Alcuni quesiti aperti riguardano la violazione di CP nel settore leptonico e la gerarchia di massa. L'esperimento DUNE sarà un progetto internazionale finalizzato allo studio delle oscillazioni di neutrino su un fascio di 1300 km dal Fermilab al South Dakota, con l'obiettivo di migliorare le nostre conoscenze sui processi che coinvolgono queste particelle. L'oggetto di questa tesi è stato lo studio delle presta
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45

Kirnosov, Nikita. "Advances in Modeling of Physical Systems Using Explicitly Correlated Gaussian Functions." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/594645.

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In this dissertation recent advances in modeling various atomic and molecular systems with quantum mechanical calculations employing explicitly correlated Gaussian functions are presented. The author has utilized multiple approaches and considered a number of approximations to develop optimal calculation frameworks. Electronic and muonic molecules and atoms have been considered. A number of unique calculations have been performed and some novel and interesting results, including high accuracy description of the charge asymmetry in the heteronuclear systems and lifetimes of rotationless vibrati
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46

Sartini, Simone. "Misure di tempo di volo di muoni cosmici con strumentazione disponibile in laboratorio." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17633/.

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La misura del tempo di volo (TOF) delle particelle cariche da sempre gioca un ruolo importante in fisica nucleare e subnucleare, in particolare per l'identificazione di particelle a lunga vita media; l'affinarsi delle tecniche sperimentali e il conseguente miglioramento della precisione delle misure ha portato nuovo interesse alle misure di TOF. In questa tesi è presentata una misura del tempo di volo dei muoni della radiazione cosmica, eseguita con la strumentazione disponibile in laboratorio. L'accento non è posto sulla ricerca del miglior risultato possibile date le tecniche di rivelazione
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47

Pacelli, Francesco. "Studio di un luminometro basato sui Drift Tubes di CMS." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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In questo lavoro di tesi si verifica la possibilità di utilizzare i conteggi del trigger di muoni basato sui Drift Tubes del rivelatore CMS per ricavare la luminosità del fascio. Si valutano tre algoritmi di trigger utilizzando dati raccolti durante il run protone-protone del 2018. Sono stati analizzati sia run in cui il rivelatore era in condizioni ideali, sia run in cui alcune parti non erano funzionanti, al fine di valutare la stabilità del luminometro realizzato. Quest’ultimo risulta stabile nei run considerati, tanto da fornire una stima della luminosità confrontabile o addirittura miglio
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48

Mollica, Davide. "Simulazioni Geant4 di muografie vulcaniche con telescopi Cherenkov." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17093/.

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Negli ultimi anni sono stati fatti grandi passi in avanti nel campo della muografia vulcanica. Questa tecnica sfrutta l'elevato potere penetrante dei muoni prodotti dall'interazione dei raggi cosmici primari con l'atmosfera terrestre per ricavare informazioni sulla struttura interna degli edifici vulcanici. La muografia permette di monitorare variazioni di densità utili a determinare lo stato di attività di un vulcano e ridurre il rischio associato. La principale difficoltà nell'applicazione della tecnica è data dal rumore di fondo di cui soffrono i rivelatori comunemente utilizzati. Per migli
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Agostini, Federica. "Caratterizzazione e calibrazione dei fotomoltiplicatori del sistema di veto di muoni per l'esperimento xenon1t." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5955/.

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Alcune osservazioni sperimentali portano ad affermare che la maggior parte della massa dell'universo è costituita da un tipo di materia definita oscura, cioè materia che interagisce solo gravitazionalmente e debolmente. I candidati più promettenti sono tipicamente identificati con le WIMP (Weakly Interacting Massive Particle). L'esperimento XENON1T per la rivelazione di materia oscura, in fase di costruzione nei Laboratori Nazionali del Gran Sasso, sfrutta uno spessore di 1.4 km di roccia schermante. Il rivelatore è una Time Projection Chamber contenente circa 2 tonnellate di xeno e avrà se
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50

Krauth, Julian [Verfasser], and Theodor W. [Akademischer Betreuer] Hänsch. "The Lamb shift of the muonic helium-3 ion and the helion charge radius / Julian Krauth ; Betreuer: Theodor W. Hänsch." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2017. http://d-nb.info/1132061083/34.

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