Log in

Relevant bibliographies by topics / Cosmic rays; Gamma rays / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Cosmic rays; Gamma rays.

Dissertations / Theses on the topic 'Cosmic rays; Gamma rays'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Cosmic rays; Gamma rays.'

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

Richardson, K. M. "Gamma rays, cosmic rays and local molecular clouds." Thesis, Durham University, 1988. http://etheses.dur.ac.uk/942/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Gabici, Stefano. "Gamma ray astronomy and the origin of galactic cosmic rays." Habilitation à diriger des recherches, Université Paris-Diderot - Paris VII, 2011. http://tel.archives-ouvertes.fr/tel-00719791.

Full text

Abstract:

Diffusive shock acceleration operating at expanding supernova remnant shells is by far the most popular model for the origin of galactic cosmic rays. Despite the general consensus received by the model, an unambiguous and conclusive proof of the supernova remnant hypothesis is still missing. In this context, the recent developments in gamma ray astronomy provide us with precious insights into the problem of the origin of galactic cosmic rays, since production of gamma rays is expected both during the acceleration of cosmic rays at supernova remnant shocks and during their subsequent propagatio

APA, Harvard, Vancouver, ISO, and other styles

3

Pinzke, Anders. "Gamma-Ray Emission from Galaxy Clusters : DARK MATTER AND COSMIC-RAYS." Doctoral thesis, Stockholms universitet, Fysikum, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-42453.

Full text

Abstract:

The quest for the first detection of a galaxy cluster in the high energy gamma-ray regime is ongoing, and even though clusters are observed in several other wave-bands, there is still no firm detection in gamma-rays. To complement the observational efforts we estimate the gamma-ray contributions from both annihilating dark matter and cosmic-ray (CR) proton as well as CR electron induced emission. Using high-resolution simulations of galaxy clusters, we find a universal concave shaped CR proton spectrum independent of the simulated galaxy cluster. Specifically, the gamma-ray spectra from decayi

APA, Harvard, Vancouver, ISO, and other styles

4

Rengifo, Gonzáles Javier. "Disentangling atmospheric cascades started by gamma rays from cosmic rays with CORSIKA." Master's thesis, Pontificia Universidad Católica del Perú, 2017. http://tesis.pucp.edu.pe/repositorio/handle/123456789/8716.

Full text

Abstract:

En este trabajo buscamos un método para diferenciar entre lluvias de partículas producidas por rayos cósmicos y por rayos gamma a energías de TeV, utilizando simulaciones CORSIKA. Este método intenta resolver el problema que existe en la búsqueda de señales de rayos gamma medidos por diversos experimentos frente a un fondo de flujo dominante de hadrones. Los resultados de este trabajo pueden aplicarse al estudio de Explosiones de Rayos Gamma (GRBs). Los GRBs emiten fotones muy energéticos, que al interactuar con la atmósfera terrestre, producen una gran cascada electromagnética de partículas s

APA, Harvard, Vancouver, ISO, and other styles

5

Lacki, Brian Cameron. "Cosmic Rays in Star-Forming Galaxies." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313437011.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

吳文謙 and Man-him Ng. "Searching for gamma-ray signals form pulsars and periodic signals fromthe galactic gamma-ray sources." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31213509.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Ng, Man-him. "Searching for gamma-ray signals form pulsars and periodic signals from the galactic gamma-ray sources /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19667942.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Chadwick, Mary Paula. "Very high energy cosmic gamma rays from radio and X-ray pulsars." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6720/.

Full text

Abstract:

This thesis is concerned with the detection of very high energy cosmic gamma-rays from isolated pulsars and X-ray binary sources using the atmospheric Cerenkov technique. A general introduction to gamma ray detection techniques is followed by adscription of the properties of atmospheric Cerenkov radiation and a discussion of the principles of the atmospheric Cerenkov technique. The Mark I and Mark II gamma-ray telescopes operated in Dugway, Utah by the University of Durham between 1981 and 1984 are briefly described. There follows a discussion of the results from observations at many different

APA, Harvard, Vancouver, ISO, and other styles

9

James, Kory T. "High energry gamma-ray source search with SPASE-2." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 65 p, 2007. http://proquest.umi.com/pqdweb?did=1397914891&sid=16&Fmt=2&clientId=8331&RQT=309&VName=PQD.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Giller, Graham L. "The construction and analysis of a whole-sky map using underground muons." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386589.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Seglar-Arroyo, Monica. "Studying the origin of cosmic-rays : Multi-messenger studies with very-high-energy gamma-ray instruments." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS260.

Full text

Abstract:

Les phénomènes explosifs qui se produisent dans l'Univers à haute énergie sont capables d'accélérer les particules jusqu'aux énergies les plus élevées. Ces processus produisent des particules secondaires de nature différente, c'est-à-dire des photons et des neutrinos. Dans des cas particuliers, ces événements induisent des perturbations sur l'espace-temps, c'est-à-dire des ondes gravitationnelles détectables par des interféromètres sur Terre. La combinaison des informations complémentaires fournies par ces messagers cosmiques peuvent permettre de répondre à des questions ouvertes en astrophysi

APA, Harvard, Vancouver, ISO, and other styles

12

Venter, Christo. "Millisecond pulsars and pulsar wind nebulae as sources of gamma rays and cosmic rays / C. Venter." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2067.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Smith, Nigel James Telfer. "A search for ultra high energy gamma ray sources from the South Pole." Thesis, University of Leeds, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291023.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

曾熙旻 and Hei-man Tsang. "Simulations and software developments for cosmic-ray and particle physics experiments in underground laboratories." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39557030.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Guberman, Daniel Alberto. "MAGIC observations with bright Moon and their application to measuring the VHE gamma-ray spectral cut-off of the PeVatron candidate Cassiopeia A." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/664122.

Full text

Abstract:

Los rayos cósmicos son núcleos atómicos que constantemente bombardean la Tierra. Está largamente aceptado que estos núcleos con energías de hasta ~3 PeV son de origen Galáctico. Pero aún no se sabe dónde en la Galaxia ni cómo son acelerados. Durante muchos años la hipótesis más popular ha sido que son acelerados en remanentes de supernova. En esta tesis presento los detalles de una serie de observaciones de la joven remanente de supernova Cassiopeia A, uno de los candidatos más prometedores a ser un Pevatrón, un sistema capaz de acelerar rayos c

APA, Harvard, Vancouver, ISO, and other styles

16

Siemens, Xavier. "Gravitational waves and cosmic strings /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2002.

Find full text

Abstract:

Thesis (Ph.D.)--Tufts University, 2002.<br>Adviser: Alexander Vilenkin. Submitted to the Dept. of Physics. Includes bibliographical references (leaves 95-98). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

APA, Harvard, Vancouver, ISO, and other styles

17

Federici, Simone. "Gamma-ray studies of the young shell-type SNR RX J1713.7-3946." Phd thesis, Universität Potsdam, 2014. http://opus.kobv.de/ubp/volltexte/2014/7173/.

Full text

Abstract:

One of the most significant current discussions in Astrophysics relates to the origin of high-energy cosmic rays. According to our current knowledge, the abundance distribution of the elements in cosmic rays at their point of origin indicates, within plausible error limits, that they were initially formed by nuclear processes in the interiors of stars. It is also believed that their energy distribution up to 1018 eV has Galactic origins. But even though the knowledge about potential sources of cosmic rays is quite poor above „ 1015 eV, that is the “knee” of the cosmic-ray spectrum, up to the k

APA, Harvard, Vancouver, ISO, and other styles

18

Tummey, Steven Peter. "A search for diffuse and point source emission of UHE gamma rays using muon content selected EAS." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336196.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Prosser, David Clarke. "A search for gamma-ray emission at energies greater than 10'1'4eV from Cygnus X-3 and eight other candidate sources." Thesis, University of Leeds, 1991. http://etheses.whiterose.ac.uk/21077/.

Full text

Abstract:

The discovery of cosmic rays with energies greater than 1014e V has posed a question that has not, as yet, been answered: where are particles accelerated to such high energies? A possible answer to this question came in 1983 with the claim made by Samorski and Stamm of an excess number of cosmic rays from the direction of Cygnus X-3. This result was then confirmed by Lloyd-Evans et al. (1983). The excess was taken to be gamma-rays as the galactic magnetic fields result in charged particles being greatly deflected. These claims led to the birth of Pe V gamma-ray astronomy and the building of nu

APA, Harvard, Vancouver, ISO, and other styles

20

Zimmer, Stephan. "Searching for Gamma Rays from Galaxy Clusters with the Fermi Large Area Telescope : Cosmic Rays and Dark Matter." Licentiate thesis, Stockholms universitet, Fysikum, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-96231.

Full text

Abstract:

In this licentiate thesis, I report a search for GeV γ rays towards the location of Galaxy clusters. I mainly discuss the results of a search for cosmic-ray (CR) induced γ-ray emission but also briefly elaborate on a related study, searching for Dark Matter (DM)-induced γ-ray emission from Galaxy clusters. In addition, I provide a detailed discussion on the analysis tools that were used and discuss some additional tests that are not included in the papers this licentiate thesis is based on. In a comprehensive search almost covering the entire sky, we find no statistically significant evidence

APA, Harvard, Vancouver, ISO, and other styles

21

Buckman, Benjamin Jerome. "Cosmic-Ray Emission as a Window into Extragalactic Environments: Starburst Galaxies & Blazars." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595554171852752.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Edwards, Peter J. "A study of the muon content of EAS initiated by the UHE gamma-ray emission from Cygnus X-3." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238238.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Peron, Giada [Verfasser], and Felix [Akademischer Betreuer] Aharonian. "Probing the Spatial and Spectral Distribution of Galactic Cosmic Rays with High-Energy Gamma-Rays / Giada Peron ; Betreuer: Felix Aharonian." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1225938627/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Zimmer, Stephan. "Observations of nearby Galaxy Clusters with the Fermi Large Area Telescope : Towards the first Gamma Rays from Clusters." Doctoral thesis, Stockholms universitet, Fysikum, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-121592.

Full text

Abstract:

Galaxy clusters are the most massive bound systems known in the Universe and are believed to have formed through large scale structure formation. They host relativistic cosmic-ray (CR) populations and are gravitationally bound by large amounts of Dark Matter (DM), both providing conditions in which high-energy gamma rays may be produced either via CR interactions with the intracluster medium or through the annihilation or decay of DM particles. Prior to the launch of the Fermi satellite, predictions were optimistic that these sources would be established as γ-ray-bright objects by observations

APA, Harvard, Vancouver, ISO, and other styles

25

Giesen, Gaelle. "Dark Matter Indirect Detection with charged cosmic rays." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112160/document.

Full text

Abstract:

Les preuves pour l'existence de la matière noire (MN), sous forme d'une particule inconnue qui rempli les halos galactiques, sont issues d'observations astrophysiques et cosmologiques: son effet gravitationnel est visible dans les rotations des galaxies, des amas de galaxies et dans la formation des grandes structures de l'univers. Une manifestation non-gravitationnelle de sa présence n'a pas encore été découverte. L'une des techniques les plus prometteuse est la détection indirecte de la MN, consistant à identifier des excès dans les flux de rayons cosmiques pouvant provenir de l'annihilation

APA, Harvard, Vancouver, ISO, and other styles

26

MacRae, John Hamish Kenneth. "The detection of very high energy cosmic gamma rays using the atmospheric Cerenkov technique." Thesis, Durham University, 1985. http://etheses.dur.ac.uk/7854/.

Full text

Abstract:

This thesis is concerned with the detection of very high energy cosmic gamma rays using the atmospheric Cerenkov technique. A general introduction to gamma ray detection techniques is followed by a detailed discussion of the principles of the atmospheric Cerenkov technique and the history of its use prior to this work. The design and operation of the University of Durham facility in Dugway, Utah is described in depth. Monte Carlo computer simulations have been developed to assist in both the understanding of the equipment and the analysis of the results for the Durham facility. The variation o

APA, Harvard, Vancouver, ISO, and other styles

27

Samuelsson, Filip. "Multi-messenger emission from gamma-ray bursts." Licentiate thesis, KTH, Partikel- och astropartikelfysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-273383.

Full text

Abstract:

Multi-messenger astronomy is a very hot topic in the astrophysical community. A messenger is something that carries information. Different astrophysical messenger types are photons, cosmic rays, neutrinos, and gravitational waves. They all carry unique and complementary information to one another. The idea with multi-messenger astronomy is that the more different types of messengers one can obtain from the same event, the more complete the physical picture becomes. In this thesis I study the multi-messenger emission from gamma-ray bursts (GRBs), the most luminous events known in the Universe.

APA, Harvard, Vancouver, ISO, and other styles

28

Galindo, Fernández Daniel. "Study of the extreme gamma-ray emission from Supernova Remnants and the Crab Pulsar." Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/663414.

Full text

Abstract:

In our Galaxy, supernova remnants and pulsars are the two most numerous populations of non-thermal objects. The goal of this thesis is to study the extreme gamma-ray emission from these two astrophysical objects with Fermi -LAT and MAGIC. In particular, supernova remnants Cassiopeia A and SNR G24.7+0.6 and the Crab pulsar. Cassiopeia A, one of the historical supernova remnants and the prime candidate of its class to be a PeVatron accelerator, has been discarded as so since we provided the first measurement of a turn-off in the gamma-ray spectrum at 3 TeV, implying the emission ob

APA, Harvard, Vancouver, ISO, and other styles

29

Zeng, Houdun, Yuliang Xin, Siming Liu, J. R. Jokipii, Li Zhang, and Shuinai Zhang. "EVOLUTION OF HIGH-ENERGY PARTICLE DISTRIBUTION IN MATURE SHELL-TYPE SUPERNOVA REMNANTS." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623101.

Full text

Abstract:

Multi-wavelength observations of mature supernova remnants (SNRs), especially with recent advances in gamma-ray astronomy, make it possible to constrain energy distribution of energetic particles within these remnants. In consideration of the SNR origin of Galactic cosmic rays and physics related to particle acceleration and radiative processes, we use a simple one-zone model to fit the nonthermal emission spectra of three shell-type SNRs located within 2 degrees on the sky: RX J1713.7-3946, CTB 37B, and CTB 37A. Although radio images of these three sources all show a shell (or half-shell) str

APA, Harvard, Vancouver, ISO, and other styles

30

Fleischhack, Henrike. "Measurement of the iron spectrum in cosmic rays with the VERITAS experiment." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2017. http://dx.doi.org/10.18452/17691.

Full text

Abstract:

Das Energiespektrum der kosmischen Strahlung bietet wichtige Hinweise auf ihren Ursprung und ihre Ausbreitung. Verschiedene Messtechniken müssen kombiniert werden, um den ganzen Energiebereich abdecken zu können: Direkte Messungen mit Teilchendetektoren bei niedrigen Energien sowie indirekte Messungen von Luftschauern bei hohen Energien. Dazu kommt die Messung von Photonen, hauptsächlich im GeV- und TeV-Bereich, die bei der Wechselwirkung von kosmischer Strahlung mit Materie oder elektromagnetischen Feldern entstehen. Im Folgenden werde ich zwei Studien dazu vorstellen, die beide auf Daten des

APA, Harvard, Vancouver, ISO, and other styles

31

Tsang, Hei-man. "Simulations and software developments for cosmic-ray and particle physics experiments in underground laboratories." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39557030.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Karlsson, Niklas. "Parametric Model for Astrophysical Proton-Proton Interactions and Applications." Doctoral thesis, Stockholm : Fysik, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4524.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Ng, Chun Yu. "Seeking the Light in the Dark: Quests for Identifying Dark Matter." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471363029.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Reichardt, Candel Ignasi. "Search for gamma-ray emission from supernova remnants with the Fermi/LAT and MAGIC telescopes." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/98414.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Tibaldo, Luigi. "Diffuse γ-ray emission observed by the Fermi Large Telescope : massive stars, cosmic rays and the census of the interstellar medium in the Galaxy". Paris 7, 2011. http://www.theses.fr/2011PA077040.

Full text

Abstract:

L'émission gamma diffuse Galactique provient des interactions des rayons cosmiques avec le gaz et le champ de rayonnement de l’énergie dans l'espace interstellaire. Elle représente la composante la plus brillante du ciel gamma de haute énergie, lequel est observé depuis 2008 avec une sensibilité et une résolution angulaire sans précédent par le Large Area Télescope (LAT) à bord du télescope spatial Fermi. L'émission diffuse Galactique ne constitue pas seulement un fond intense et structuré qui doit être modélisé pour étudier les sources individuelles ou les composantes diffuses plus faibles, m

APA, Harvard, Vancouver, ISO, and other styles

36

Nakamura, Toshio, Kentarou Nagaya, Fusa Miyake та ін. "炭素14と宇宙線変動 : 奈良時代の異変". 名古屋大学年代測定資料研究センター, 2013. http://hdl.handle.net/2237/20130.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Anjos, Rita de Cássia dos. "Propagação de raios cósmicos extragaláticos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-18082014-142550/.

Full text

Abstract:

Recentemente, o Observatório Pierre Auger tem medido espectro de energia de Raios Cósmicos Ultra Energéticos (Ultra High Energy Cosmic Rays - UHECR) (E > 1019 eV) com grande acurácia. No entanto, o estudo de raios cósmicos ultra energéticos na Terra tem uma forte dependência do estudo de sua propagação no Universo. Neste trabalho, abordamos o estudo da propagação de raios cósmicos em diferentes aspectos. Núcleos em alta energia interagem com os campos de radiação no caminho da fonte à Terra. A interação mais importante é a fotodesintegração. Na primeira parte, implementamos de maneira analí

APA, Harvard, Vancouver, ISO, and other styles

38

Bustamante, Ramírez Mauricio [Verfasser], Walter [Gutachter] Winter, Karl [Gutachter] Mannheim, and Raimund [Gutachter] Ströhmer. "Ultra-high-energy neutrinos and cosmic rays from gamma-ray bursts: exploring and updating the connection / Mauricio Bustamante. Gutachter: Walter Winter ; Karl Mannheim ; Raimund Ströhmer." Würzburg : Universität Würzburg, 2015. http://d-nb.info/111188692X/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

El, Aisati Chaimae. "Gamma-ray and Neutrino Lines from Dark Matter: multi-messenger and dedicated smoking-gun searches." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/266180.

Full text

Abstract:

Identifying what makes up the Dark Matter is a long-standing problem to which the abundance of gravitational and cosmological evidence fails to answer. Indirect detection techniques have the aim to unveil the nature of Dark Matter by catching and identifying the products of potential decays and/or annihilations. The work exposed in this thesis is in line with this strategy and has for common thread the quest for line(-like) features in the extraterrestrial fluxes of gamma-rays and neutrinos. The motivation behind this specific interest is that, due to the absence of astrophysical counterparts

APA, Harvard, Vancouver, ISO, and other styles

40

Díaz, Trigo María. "Collecting heat during the day, observing the sky at night the use of a heliostat field near Almería to search for cosmic gamma rays /." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964426986.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Heinze, Jonas. "Ultra-high-energy cosmic-ray nuclei and neutrinos in models of gamma-ray bursts and extragalactic propagation." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21386.

Full text

Abstract:

Utrahochenergetische kosmische Strahlung (ultra-high-energy cosmic rays -- UHECR) besteht aus ionisierten Atomkernen mit den höchsten Teilchenergien, die je gemessen wurden. Zwar wurden die Quellen von UHECRs noch nicht eindeutig identifiziert, doch gibt es deutliche Anzeichen, dass sie extragalaktisch sind. Um die Beobachtungen zu interpretieren, wird ein Modell der Wechselwirkungen mit Photofeldern sowohl in der Quelle als auch während der extragalaktischen Propagation benötigt. Bei diesen Wechselwirkungen werden sekundäre Neutrinos erzeugt. Diese Dissertation behandelt Modelle der Que

APA, Harvard, Vancouver, ISO, and other styles

42

Raab, Christoph. "Searches for Neutrino Emission from Blazar Flares with IceCube." Doctoral thesis, Universite Libre de Bruxelles, 2021. https://dipot.ulb.ac.be/dspace/bitstream/2013/325215/3/toc.pdf.

Full text

Abstract:

Cosmic rays reach Earth from beyond the Milky Way and with energies up to 10^20 eV.The responsible accelerators have to date not been discovered. However, multi-messenger astronomy can shed light on the question, based on the principle that protons and nuclei accelerated in dense and energetic environments would also produce gamma rays and neutrinos. Such environments may be found in "blazars", which are therefore cosmic ray accelerator candidates. Their gamma-ray emission has been observed to increase, sometimes by orders of magnitude, during "flares" as observed in light curves taken by the

APA, Harvard, Vancouver, ISO, and other styles

43

Krayzel, Fabien. "Etude de phénomènes non-thermiques dans les amas d'étoiles jeunes : modélisation et analyse des données de H.E.S.S." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY079.

Full text

Abstract:

Voilà plus d'un siècle que Victor Hess a montré l'origine cosmique de ce mystérieux rayonnement ionisant, et pourtant ce dernier n'a pas fini de livrer tous ces secrets. En deçà d'une énergie de l'ordre du PeV, les vestiges de supernovae sont les candidats les plus sérieux pour rendre compte de l'accélération de ces particules cosmiques. Si toutefois cette hypothèse demeure toujours d'actualité, alors qu'auparavant on le considérait comme un événement isolé dans la Galaxie, on constate plutôt aujourd'hui que ces explosions d'étoiles massives surviennent majoritairement au sein de grandes struc

APA, Harvard, Vancouver, ISO, and other styles

44

Bonnivard, Vincent. "Détection indirecte de matière noire : des galaxies naines sphéroïdes en photons gamma à la recherche d'anti-hélium avec l'expérience AMS-02." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY022/document.

Full text

Abstract:

De nombreuses observations astrophysiques indiquent l'existence de grandes quantités de masse manquante dans l'Univers, et ce de l'échelle galactique à l'échelle cosmologique. Découvrir la nature de cette masse invisible constitue le problème de la matière noire, qui apparaît comme l'un des enjeux majeurs de la physique moderne. Cette thèse s'inscrit dans le contexte de la détection indirecte de matière noire. Cette dernière serait composée de nouvelles particules élémentaires, dont les produits d'annihilation pourraient être observés dans le rayonnement cosmique. Nous étudions dans ce travail

APA, Harvard, Vancouver, ISO, and other styles

45

Trichard, Cyril. "Etude du rayonnement gamma de vestiges de supernova en interaction avec des nuages moléculaires et optimisation de l'analyse des données de H.E.S.S." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY070/document.

Full text

Abstract:

L'expérience H.E.S.S. est un réseau de télescope Tcherenkov, situé en Namibie, qui observe le rayonnement de sources astrophysiques de rayons gamma de très haute énergie. Depuis sa mise en service il y a plus de dix ans, H.E.S.S. a permis d'améliorer considérablement notre vision de l'univers à ces énergies. Depuis 2012, le démarrage de la deuxième phase de l'expérience avec la mise en service d'un cinquième télescope permet de baisser le seuil en énergie de l'expérience.L'optimisation d'une analyse multivariée au sein de l'expérience H.E.S.S. est présentée dans cette thèse. L'analyse Xeff a é

APA, Harvard, Vancouver, ISO, and other styles

46

Porelli, Andrea. "TAIGA-HiSCORE: a new wide-angle air Cherenkov detector for multi-TeV gamma-astronomy and cosmic ray physics." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21610.

Full text

Abstract:

Der TAIGA Detektor (“Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy”) testet eine neue Nachweismethode der erdgebundenen Cherenkov Gamma Astronomie fuer 10TeV bis einige PeV, und fuer kosmische Strahlung oberhalb 100TeV: die Kombination abbildender und nicht-abbildender Cherenkov Detektoren in einem hybriden System. Im Fokus der Arbeit steht TAIGA-HiSCORE - ein Cherenkov Detektorfeld mit grosser Apertur zur Messung der Zeitstruktur der Cherenkovlichtfront in atmosphaerischen Luftschauern (EAS). Die Praezisonsvermessung der Schauerrichtung basiert auf (1) sub-nsec Zeitsy

APA, Harvard, Vancouver, ISO, and other styles

47

Biehl, Daniel. "Nuclear Cascades and Neutrino Production in the Sources of Ultra-High Energy Cosmic Ray Nuclei." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20448.

Full text

Abstract:

Der Ursprung ultra-hochenergetischer kosmischer Strahlung (UHECRs) ist eine der wichtigsten offenen Fragen der Astrophysik. Gammastrahlenblitze (GRBs) galten als potentielle Quellen, da sie zu den energetischsten Ereignissen im Universum zählen. Konventionelle Szenarien sind jedoch durch Neutrinodaten stark eingeschränkt. Außerdem weisen Messungen der chemischen Zusammensetzung kosmischer Strahlen auf schwere Kerne hin, welche in zu dichten Strahlungsfeldern disintegrieren würden. Um dieses Dilemma zu umgehen deuten neue Studien auf versteckte Beschleuniger hin, welche schwer zu detektieren si

APA, Harvard, Vancouver, ISO, and other styles

48

Joubaud, Théo. "Etude de la superbulle d'Orion-Eridanus : gaz, champs magnétiques et rayons cosmiques." Thesis, Université de Paris (2019-....), 2019. http://www.theses.fr/2019UNIP7077.

Full text

Abstract:

La plupart des supernovae dans notre Galaxie explosent dans des amas d’étoiles massives. Avec les vents et les rayonnements intenses des étoiles les plus massives elles forment des bulles chaudes en expansion, d’une taille d’une centaine de parsecs, appelées superbulles. Ces régions de la Galaxie sont des laboratoires de choix pour étudier la rétroaction stellaire sur le milieu interstellaire. Le gaz et les champs magnétiques initialement présents sont balayés. Une cavité se forme, remplie d’un plasma turbulent et traversée par de nombreuses ondes de chocs. Ce type d’environnement peut forteme

APA, Harvard, Vancouver, ISO, and other styles

49

Martraire, Diane. "Étude du pouvoir de discrimination des primaires initiant les grandes gerbes atmosphériques avec des réseaux de détecteurs au sol : analyse des rayons cosmiques de ultra haute énergie détectés à l’observatoire Pierre Auger, Estimation des performances pour la detection de gamma de très haute énergie du future observatoire LHAASO." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112276/document.

Full text

Abstract:

Depuis plus d’un siècle, les rayons cosmiques d’ultra-haute énergie (RCUHE), ayant une énergie supérieure à 1018 eV, continuent d’entretenir le mystère : Quelle est leur composition ? D’où viennent-ils ? Comment atteignent-ils de telles énergies ? Ces particules chargées, suffisamment énergétiques pour atteindre la Terre, forment des gerbes de particules secondaires via leurs interactions avec l’atmosphère dont le développement est caractéristique de la nature de la particule primaire. L’observatoire Pierre Auger, avec sa structure hybride et son gigantesque réseau de détecteurs peuvent apport

APA, Harvard, Vancouver, ISO, and other styles

50

Norén, Magnus. "Measuring the vertical muon intensity with the ALTO prototype at Linnaeus University." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-107133.

Full text

Abstract:

ALTO is a project, currently in the research and development phase, with the goal of constructing a Very High Energy (VHE) gamma-ray observatory in the southern hemisphere. It will detect the particle content reaching the ground from the interactions of either VHE gamma rays or cosmic rays in the atmosphere known as extensive air showers. In this thesis, we use an ALTO prototype built at Linneaus University to estimate the vertical muon intensity in Växjö. The atmospheric muons we detect at ground level come from hadronic showers caused by a cosmic ray entering the atmosphere. Such showers are

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!