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Dissertations / Theses on the topic 'Gamma rays or X-rays'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Calle, PeÌrez Ignacio de la. "Detection of high energy gamma rays from X-ray selected blazars." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270857.

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2

Beckmann, Volker. "Unification of Active Galactic Nuclei at X-rays and soft gamma-rays." Habilitation à diriger des recherches, Université Paris-Diderot - Paris VII, 2010. http://tel.archives-ouvertes.fr/tel-00601042.

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Through the work on X-ray and gamma-ray data of AGN I contributed significantly to the progress in the unification of AGN since I finished my PhD in 2000. <p> The study of the evolutionary behaviour of X-ray selected blazars (Beckmann & Wolter 2001; Beckmann et al. 2002, 2003b; Beckmann 2003) shows that their evolution is not as strongly negative as indicated by previous studies. The overall luminosity function is consistent with no evolution in the 0.1−2.4 keV band as seen by ROSAT/PSPC. There is still a difference compared to the luminosity function of FSRQ and LBL, which seem to show a posi

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3

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/.

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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

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4

Dowthwaite, J. C. "Very energetic gamma rays from binary X-ray sources and other astronomical objects." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/7064/.

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This thesis describes the observation of a number of astronomical objects using the University of Durham Atmospheric Cerenkov light detectors. The array of telescopes was used to study the Very High Energy (V.H.E.) gamma-radiation from these objects from June 1981 until November 1984.The general features of Gamma-ray astronomy are briefly discussed, and a review of the main results of previous gamma-ray observations is given. The basic theory and general characteristics of Atmospheric Cerenkov Effect experiments are reviewed. Details of the design, operation and performance of the University o

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5

高樹豐 and Shu-fung Ko. "Emission morphologies and phase-resolved spectrum of gamma ray pulsar." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224489.

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6

Ko, Shu-fung. "Emission morphologies and phase-resolved spectrum of gamma ray pulsar /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk:8888/cgi-bin/hkuto%5Ftoc%5Fpdf?B23476370.

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7

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

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8

battersby, Stephen Joseph Richard. "Gamma-rays and active galaxies." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336471.

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9

Latham, Ian James. "V.H.E. gamma rays from microquasars." Thesis, Durham University, 2006. http://etheses.dur.ac.uk/2946/.

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This thesis is concerned with the detection of very high energy (VHE) 7-rays from microquasars, a recently discovered subclass of x-ray binaries that display jets of relativistic particles. A general introduction to ground based 7-ray astronomy is presented, which discusses the production of Cherenkov radiation and how VHE 7-rays are detected via extended air showers in the atmosphere. The important processes involved in the production and absorption of 7-rays are detailed, before the design of The High Energy Stereoscopic System (H.E.S.S.) Phase I telescope array, based in Namibia, is briefly

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10

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.

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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

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11

Moftah, Belal Ali. "A study of X and gamma rays following muon capture in 28Si." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30135.

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Negative muons produced via the backward decay of pions in the M9b beam channel at TRIUMF were stopped in a ²⁸Si target. The energies of the muonic X-rays and nuclear γ-rays following the muon capture were measured in order to identify a Doppler broadened γ ray line in ²⁸A1 which is suitable for analysis in terms of a γ — ν angular correlation to determine a value for the induced-pseudoscalar coupling constant (gp ). The muon beam was also stopped in 6 other background targets ( polythene, A1, stainless steel, Cu, Pb and BGO ) and their X- and γ-ray energies have been studied so as to fully u

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12

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.

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13

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.

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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

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14

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.

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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

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15

余君岳 and Kwan-ngok Peter Yu. "The origin of extragalactic gamma rays." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31231469.

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16

Kirkman, Ian W. "VHE gamma rays from celestial objects." Thesis, Durham University, 1985. http://etheses.dur.ac.uk/7850/.

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This Thesis describes and discusses the results obtained from observations of the astronomical objects Cygnus X-3 and the Crab Pulsar, made during 1981 and 1982 using the Very High Energy (VHE) Gamma Ray Astronomy Facility of the University of Durham. Following an introductory chapter, chapter two describes the observational technique used for the work (known as the 'Atmospheric Cerenkov Technique') and chapter three describes in some detail the design, construction and operation of the equipment. Chapter four summarises the data taken during the course of the observations, whilst chapter five

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17

Abdelrahman, Y. S. "Prompt gamma-rays from fission fragments." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234192.

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18

Yu, Kwan-ngok Peter. "The origin of extragalactic gamma rays /." [Hong Kong : University of Hong Kong], 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12362827.

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19

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.

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20

Esau, Andrew John. "Monte Carlo Simulations of Complex Germanium Escape Suppression Spectrometers with MCNPX a Case Study." Thesis, University of the Western Cape, 2009. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_7899_1276453432.

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<p>Gamma ray spectroscopy has provided enormous amounts of information on the behaviour and structure of atomic nuclei [SHA88, BEA92, EBE08]. Most of the major discoveries in experimental nuclear physics over the last five decades are strongly associated with improvements in detector technologies. Inorganic scintilators led to the discovery in 1963 of the first excited states of a rotational band based on the ground state of 162Dy. Improvements in peak-to-background ratios and detector resolutions obtained with germanium led to the first evidence of backbending which is associated with a two q

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21

Banik, Prabir. "Probing the sources of cosmic rays with high energy gamma rays and neutrinos." Thesis, University of North Bengal, 2017. http://hdl.handle.net/123456789/2711.

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22

Reesman, Rebecca R. "Gamma-Rays as Probes of the Universe." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406122854.

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23

Chandler, Adam M. Prince Thomas A. "Pulsar searches : from radio to gamma-rays /." Diss., Pasadena, Calif. : California Institute of Technology, 2003. http://resolver.caltech.edu/CaltechETD:etd-01232003-213508.

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24

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.

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25

Villa, Marcelo Barros. "Estudo da função resposta de um detector cintilador de Nal(TI)." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-20052014-113830/.

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O conhecimento preciso do espectro energético de fótons é de extrema importância na radioterapia no que se refere à escolha adequada das doses a que os pacientes são submetidos. Os dados de saída dos detectores de radiação são apenas espectros de altura de pulso (PHD), ao invés de espectros de energia, que correspondem a informações distorcidas sobre a fonte e seus decaimentos devido a diversos erros associados ao processo de cintilação do cristal e à eletrônica. Os resultados medidos foram obtidos com o uso de um detector cintilador de NaI(Tl) e as simulações Monte Carlo foram feitas com o us

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26

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.

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27

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.

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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

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28

Cardwell, David A. "Compton scattering with gamma-rays and synchrotron radiation." Thesis, University of Warwick, 1987. http://wrap.warwick.ac.uk/99433/.

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Directional Compton profile measurements of aluminium and chromium have been performed with 60 keV and 412 keV γ-radiation to assess the complementarity of the 241Am and 198Au spectrometer systems in common use by experimentalists. Revision of the data reduction procedure has yielded symmetrical Compton profiles within experimental error for the first time. The effects of exchange and correlation on theoretical Compton profiles calculated within the local density approximation have been evaluated via the Lam-Platzman correction and applied to existing transition metal results. Novel experiment

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29

Dickinson, Hugh John. "Very high energy gamma-rays from binary systems." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/290/.

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This thesis presents a study of the very high energy (VHE) gamma-ray emission from X-ray binary systems using the H.E.S.S. imaging atmospheric Cherenkov array. The historical background and basic principles of ground-based gamma-ray astronomy are briefly reviewed and an overview of the design and capabilities of the H.E.S.S. telescope system is presented. The broadband observational properties of X-ray binary systems and their relevance in a broader astrophysical context is also discussed. A review of the radiative emission mechanisms which relate to VHE gamma-ray emission in X-ray binaries is

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30

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

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31

Cheung, Wai-man, and 張惠民. "Unpulsed gamma rays from the Crab pulsar and nebula." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31211306.

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32

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.

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33

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.

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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

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34

Li, Chung-chuen. "Radiation exposure due to radon and gamma rays in Hong Kong /." Hong Kong : University of Hong Kong, 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13148400.

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35

吳子皎 and Tze-kau Ng. "A study of diffuse galactic gamma radiation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31209397.

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36

Ng, Tze-kau. "A study of diffuse galactic gamma radiation /." [Hong Kong : University of Hong Kong], 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12584289.

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37

NARDINI, MARCO. "Optical versus X–ray afterglows of GRBs: towards understanding the emission processes." Doctoral thesis, Scuola Internazionale Superiore di Studi Avanzati (SISSA), 2009. http://hdl.handle.net/10281/23600.

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Gamma–Ray Bursts (GRBs) are the most distant objects ever detected after the recombination epoch. They consist of a short intense emission episode of gammarays (10 keV–2 MeV) with typical duration between 10−2 and 103 seconds. This is called the “prompt” emission phase. GRBs are classified, according to their observed duration, into short GRBs (lasting less than 2s) and long GRBs (lasting more than 2 s). During the prompt phase GRBs are the brightest objects in the gamma–ray sky. The gamma–ray prompt emission is accompanied by a long lasting emission, called “afterglow”, covering the w

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38

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/.

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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

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39

Ödmark, Fredrik. "Model based pulse shaping for detection of gamma rays." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66637.

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To analyse drill samples in a mine, a scanner that uses a gamma ray detector can be used. The scanner can analyse the drill sample to quickly see the elements present in the sample without destroying it. To improve the performance of the scanner, the electric signal from the detector needs to be less noisy, and different pulse shaping methods, filters and smoothers can be used on the sampled data to achieve an improved performance. In this master thesis, the electric noise model of the electronics around the detector was modeled, and analysed. Different pulse shaping method, filters and smooth

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40

Saunders, Jessica. "Secondary prompt gamma-rays to improve proton range verification." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55003.

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The goal of this research is to evaluate the secondary prompt gamma (PG) yield from proton therapy at high characteristic energies from MC model simulations and experimental data. Recent studies indicate that target composition influences PG characteristic energy and yield, and the quantification of PG may be used to offer real-time dose verification for proton therapy. In this study PG analysis was performed for MC simulations to evaluate the characteristic measurements and total yield of secondary PG emitted from a target in the 0-8 MeV range from a proton therapy beam over a range of four

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41

Dutson, Kate Louise. "Gamma rays from galaxy clusters and their dominant members." Thesis, University of Leicester, 2014. http://hdl.handle.net/2381/29035.

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Clusters of galaxies are a long-expected source class of diffuse γ-ray emission, but a detection of such is yet to be made. Point-like signals from their dominant mem- bers are observed, and provide fresh insight into the processes involved in feedback from active galaxies, which suppress cooling in cluster cores, and inject non-thermal particles into the intracluster medium. The case for multi-scale γ-ray emission via leptonic and hadronic channels subse- quent to cosmic-ray acceleration, dark matter annihilation, and processes driven by the active nuclei of brightest cluster galaxies (BCGs),

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42

Cheung, Wai-man. "Unpulsed gamma rays from the Crab pulsar and nebula /." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13544536.

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43

Pracilio, Gabriella. "The utilisation of gamma ray spectrometry, a soil mapping technology, to improve dryland crop production /." Connect to this title, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0099.

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44

Roberts, Michael Damien. "A search for very high energy gamma-rays from Hercules X-1 using the pulse profile technique /." Title page, contents and summary only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phr6461.pdf.

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45

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.

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46

DICHIARA, Simone. "A multiwavelength view of the transient sky: gamma-ray bursts and other fast transients from optical to gamma-rays." Doctoral thesis, Università degli studi di Ferrara, 2015. http://hdl.handle.net/11392/2389002.

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47

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/.

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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

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48

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.

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49

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.

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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

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50

Reuschle, Christian Andreas. "A neural network based on background supression [i.e. suppression] technique applied to VHE gamma ray data coming from the Crab pulsar." Connect to this title, 2008. http://scholarworks.umass.edu/theses/145/.

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