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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 352 for “"Gamma ray"”.
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Optical and gamma-ray study of gamma-ray binaries
Gamma-ray binary stars are intriguing interacting stellar systems that exhibit emission across the whole electromagnetic spectrum. This thesis is focused on optical and gamma-ray emission of gamma-ray binary stars (GRBis). I have performed radial velocity measurements of 1FGL J1018.6-5856 to derive …
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Gamma-ray bursts with MeerLICHT
… is the multi-wavelength observational study of gamma-ray burst (GRB) afterglows. The driving force behind this work is the fully robotic MeerLICHT optical telescope which is able to rapidly slew to the position of a GRB in the sky and obtain multi-lter follow-up observations of the early phases …
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Orientation of gamma-ray telescope
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1960.
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The measurement of gamma ray-induced heating in a mixed neutron and gamma ray environment
The problem of measuring the gamma heating in a mixed DT neutron and gamma ray environment was explored. A new detector technique was developed to make this measurement. Gamma heating measurements were made in a low-Z assembly irradiated with 14-MeV neutrons and (n,n$\sp\prime$) gammas produced by …
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Towards Gamma-Ray Telescopes in Australia
Recent decades have seen the rise of the field of gamma-ray astronomy, probing the most extreme environments in our Universe. The upcoming Cherenkov Telescope Array Observatory (CTAO), alongside H.E.S.S. in Namibia, are Imaging Air Cherenkov Telescopes (IACTs) that will cover roughly two thirds of …
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Gamma-Ray Burst Early Optical Afterglow Modelling
We discuss the evolution of a relativistic outflow responsible for producing the emission associated with GRBs. We investigate how afterglows are produced in the inter- action between the outflow and the ambient medium. Understanding the properties of the outflow from afterglow emission can be …
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Gamma-Ray Observations of X-ray Binaries
<p>The detection of GeV/TeV emission from X-ray binaries (XRBs) has established a new class of high-energy (HE, >0.1 GeV) and very-high-energy (VHE, >100 GeV) gamma-ray emitters. XRBs are formed by a compact object, either a neutron star or a black hole, and by an optical companion star. Some XRBs …
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Advanced adaptive library for gamma-ray spectrometers
Item withdrawn by Laura Spradlin (lspradl2@illinois.edu) on 2014-04-28T16:46:46Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Kong_Xianliang.docx: 3637946 bytes, checksum: c93870ae591371661924d085ce6541db (MD5) Kong_Xianliang.pdf: 9861947 …
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Doppler-Broadening of Light Nuclei Gamma-Ray Spectra
… causing a de-excitation process emitting a gamma-ray. The spectrum displayed by the collection of these gamma-rays gives valuable information regarding the material’s elemental make-up. It has been hypothesized that gamma-rays from neutron-induced gamma-ray reactions on light elements with …
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Solar flare gamma-ray spectroscopy with CGRO-COMPTEL
<p>The X-ray and gamma-ray emission from solar flares provides important information about high-energy particles in solar flares. Energetic protons and ions interact with the solar atmosphere, giving rise to nuclear line emission at MeV energies and higher energy photons from the decay of neutral …
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Gamma ray astronomy in the low energy range
A low energy gamma ray telescope, and the results of its observations are described. The telescope consisted of four sodium iodide crystals, each of 120 cm<sup>2</sup> area, occulted by lead discs. Charged particles are rejected using scintillation, anti-coincidence shields.<br/><br/>The telescope …
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Observations of variability of TeV gamma-ray blazars
The boom in ground-based gamma-ray astronomy since the beginning of the 21st century has enabled a new probe of the universe using very-high-energy photons. The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is an array of four 12-m imaging Cherenkov telescopes that is sensitive …
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Gamma-Ray Optical Studies of ⁷³Ge and ⁵⁷Fe
… the more popular theories for development of a gamma-ray laser. This work is a "marriage" between the Borrmann effect, which is a consequence of the dynamical theory of x-ray diffraction, and time-filtering which comes from time-domain Mossbauer spectroscopy.</p> <p>Our experiments involved the …
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Gamma-ray spectrometric systems of radioactive fallout analysis
Thesis (M.S.)--Michigan State University. Dept. of Mechanical Engineering, 1963
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Precursors in Gamma-ray Bursts Observed by Fermi
Gamma-ray bursts (GRBs) are some of the most energetic explosions in the universe. They come from the core collapses of massive stars and the mergers of compact objects, and are observed as bright flashes of gamma rays (prompt emission) followed by long-lived, fading emission (afterglow) across the …
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Teilchenbeschleunigung an ultrarelativistischen Stoßfronten und Gamma-Ray Bursts
… untersucht. Stoßfronten dieser Art werden in Gamma-Ray Bursts vermutet, kurzen Ausbrüchen von Gamma-Strahlung, die die leuchtstärksten Objekte im Universum sind und nicht-thermische Spektra aufweisen. Die Teilchenverteilungsfunktion für den Beschleunigungsprozeß wird mit einer …
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