Academic literature on the topic 'Gamma ray signatures'

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Journal articles on the topic "Gamma ray signatures"

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Cirelli, Marco. "Gamma-ray signatures of Dark Matter." EPJ Web of Conferences 136 (2017): 01004. http://dx.doi.org/10.1051/epjconf/201713601004.

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Valle, G. "Gamma ray signatures from Galactic neutralino annihilation." Astronomy & Astrophysics 424, no. 3 (2004): 765–72. http://dx.doi.org/10.1051/0004-6361:20041042.

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Gabici, S., and F. A. Aharonian. "Gamma ray signatures of ultra high energy cosmic ray accelerators." Astronomische Nachrichten 327, no. 5-6 (2006): 619–23. http://dx.doi.org/10.1002/asna.200610605.

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The, Lih-Sin, Donald D. Clayton, and Adam Burrows. "X-Ray and Gamma-Ray Signatures of Wolf-Rayet Supernova Explosions." Symposium - International Astronomical Union 143 (1991): 537–46. http://dx.doi.org/10.1017/s007418090004571x.

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It is widely speculated that a Type Ib supernova is the explosion of a Wolf-Rayet star. We calculate the X-ray and gamma-ray signatures of models of that type, assuming all hard photons to have originated with Ni decay chains, in hopes of providing diagnostics of the exposed-core models of massive stars, which constitute one model of the Wolf-Rayet stars, calculated by Ensman and Woosley (1988). These provide the characteristic luminosity peak and light curve of Type Ib supernovae for helium-core masses between 4 and 6 M⊙. We compute gamma-ray line shapes and fluxes and the Comptonized X-ray continuum resulting from the decay of the radioactive 56Co and 57Co isotopes that are synthesized by the explosion of the presupernova star (the suggested Wolf-Rayet or post-Wolf-Rayet star) with a Monte Carlo transport code. The expansion velocity, the total mass of the ejecta, the radial mixing of radioactivity in that ejecta, and the 56Ni yield effect both the strength and the evolution of the hard radiation. With the anticipated launch of Gamma Ray Observatory, we can hope to detect Type Ib supernovae to distances of 3 Mpc and utilize the characteristics of the gamma lines and X-ray spectrum to distinguish between differing Type Ib supernova models and to address their suggested relationship to Wolf-Rayet stars.
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GEHRELS, N., and J. K. CANNIZZO. "GAMMA-RAY BURSTS — OBSERVATIONS." International Journal of Modern Physics D 19, no. 06 (2010): 977–84. http://dx.doi.org/10.1142/s021827181001710x.

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We are in an exciting period of discovery for gamma-ray bursts. The Swift observatory is detecting 100 bursts per year, providing arcsecond localizations and sensitive observations of the prompt and afterglow emission. The Fermi observatory is observing 250 bursts per year with its medium-energy GRB instrument and about 10 bursts per year with its high-energy LAT instrument. In addition, rapid-response telescopes on the ground are providing new capabilities to study optical emission during the prompt phase and spectral signatures of the host galaxies. The combined data set is enabling great advances in our understanding of GRBs including afterglow physics, short burst origin, and high-energy emission.
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Zhang, H., I. M. Christie, M. Petropoulou, J. M. Rueda-Becerril, and D. Giannios. "Inverse Compton signatures of gamma-ray burst afterglows." Monthly Notices of the Royal Astronomical Society 496, no. 1 (2020): 974–86. http://dx.doi.org/10.1093/mnras/staa1583.

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ABSTRACT The afterglow emission from gamma-ray bursts (GRBs) is believed to originate from a relativistic blast wave driven into the circumburst medium. Although the afterglow emission from radio up to X-ray frequencies is thought to originate from synchrotron radiation emitted by relativistic, non-thermal electrons accelerated by the blast wave, the origin of the emission at high energies (HE; ≳GeV) remains uncertain. The recent detection of sub-TeV emission from GRB 190114C by the Major Atmospheric Gamma Imaging Cherenkov Telescopes (MAGIC) raises further debate on what powers the very high energy (VHE; ≳300 GeV) emission. Here, we explore the inverse Compton scenario as a candidate for the HE and VHE emissions, considering two sources of seed photons for scattering: synchrotron photons from the blast wave (synchrotron self-Compton or SSC) and isotropic photon fields external to the blast wave (external Compton). For each case, we compute the multiwavelength afterglow spectra and light curves. We find that SSC will dominate particle cooling and the GeV emission, unless a dense ambient infrared photon field, typical of star-forming regions, is present. Additionally, considering the extragalactic background light attenuation, we discuss the detectability of VHE afterglows by existing and future gamma-ray instruments for a wide range of model parameters. Studying GRB 190114C, we find that its afterglow emission in the Fermi-Large Area Telescope (LAT) band is synchrotron dominated. The late-time Fermi-LAT measurement (i.e. t ∼ 104 s), and the MAGIC observation also set an upper limit on the energy density of a putative external infrared photon field (i.e. ${\lesssim} 3\times 10^{-9}\, {\rm erg\, cm^{-3}}$), making the inverse Compton dominant in the sub-TeV energies.
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Parsotan, Tyler, Diego López-Cámara, and Davide Lazzati. "Photospheric Polarization Signatures from Long Gamma-Ray Burst Simulations." Astrophysical Journal 896, no. 2 (2020): 139. http://dx.doi.org/10.3847/1538-4357/ab910f.

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McIntyre, Justin I., Brian T. Schrom, Mathew W. Cooper, et al. "LaCl3:Ce coincidence signatures to calibrate gamma-ray detectors." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 652, no. 1 (2011): 201–4. http://dx.doi.org/10.1016/j.nima.2011.02.072.

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Burrows, Adam, and Lih-Sin The. "X- and gamma-ray signatures of type IA supernovae." Astrophysical Journal 360 (September 1990): 626. http://dx.doi.org/10.1086/169150.

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Murase, Kohta, and Kunihito Ioka. "Closure Relations fore±Pair Signatures in Gamma‐Ray Bursts." Astrophysical Journal 676, no. 2 (2008): 1123–29. http://dx.doi.org/10.1086/527667.

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Dissertations / Theses on the topic "Gamma ray signatures"

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Brewer, Rebecca L. "Neutron and neutron-induced gamma ray signatures as a template matching technique for explosives detection." Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/2230.

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Tran, David [Verfasser], Alejandro [Akademischer Betreuer] Ibarra, and Michael [Akademischer Betreuer] Ratz. "Indirect Signatures of Unstable Dark Matter in Cosmic-Ray Antimatter and in the Gamma-Ray Sky / David Tran. Gutachter: Alejandro Ibarra ; Michael Ratz. Betreuer: Alejandro Ibarra." München : Universitätsbibliothek der TU München, 2011. http://d-nb.info/1014330122/34.

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Chantler, Hannah Jane. "High-spin gamma-ray spectroscopy of doubly odd 124La; signature inversion in πh11/2 x vh11/2 bands." Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396474.

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Calore, Francesca Verfasser], and Torsten [Akademischer Betreuer] [Bringmann. "Unveiling Dark Matter through Gamma Rays : Spectral Features, Spatial Signatures and Astrophysical Backgrounds / Francesca Calore. Betreuer: Torsten Bringmann." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2013. http://d-nb.info/1045023736/34.

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Brewton, Asani. "Development of a Borehole Log Signature for Oceanic Anoxic Events and Its Application to the Gulf of Mexico." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/866.

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Oceanic anoxic events (OAEs) are periods in Earth's history when oceans were depleted in dissolved oxygen and characterized by deposition of organic-rich sediments. The Oceanic Drilling Program (ODP) has drilled through OAEs in a number of areas worldwide, collecting core and borehole log data. This project attempts to identify a characteristic signature from known ODP OAE sections using these data and to apply the signature to identify OAE intervals in Gulf of Mexico wells where cores are lacking. Additionally, pseudo density curves were generated from ODP logs and compared to bulk density logs to determine if the deviation between the two would aid identification of OAE intervals. A general, though not fool proof, signature of high gamma ray, uranium, neutron porosity and low density was seen in nearly all of the ODP holes. Using this signature 20 potential OAE intervals were identified in the Gulf of Mexico.
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Schreiber, Samuel Stuart. "Identification of the radionuclides in spent nuclear fuel that may be detected by Compton suppression and gamma-gamma coincidence methods." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-2701.

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The nuclides present in spent nuclear fuel are categorized according to their capacity for detection by Compton suppression or gamma-gamma coincidence methods. The fifty nuclides with the highest activities in spent fuel are identified, their decay schemes analyzed, and the best detection scheme for each is recommended.<br>text
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Zeh, Andreas [Verfasser]. "Signaturen massereicher Sterne in Gamma-Ray-Burst-Afterglows / von Andreas Zeh." 2008. http://d-nb.info/990002004/34.

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Books on the topic "Gamma ray signatures"

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Celli, Silvia. Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33124-5.

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Assembly, COSPAR Scientific. X-ray and gamma-ray signatures of black holes and weakly magnetized neutron stars: Proceedings of the E1.2-H0.3 symposium of COSPAR Scientific Commission E which was held during the thirty-third COSPAR Scientific Assembly, Warsaw, Poland, July, 2000. Published for the Committee on Space Research [by] Pergamon, 2001.

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Celli, Silvia. Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators. Springer, 2019.

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X-ray and gamma-ray signatures of black holes and weakly magnetized neutron stars. Elsevier Science, 2001.

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Book chapters on the topic "Gamma ray signatures"

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Celli, Silvia. "Sensitivity Studies for Gamma-Ray and Neutrino Telescopes." In Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33124-5_5.

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de Jager, O. C. "Cold Dust Signatures on SNR Gamma Ray Spectra." In New Extragalactic Perspectives in the New South Africa. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0335-7_6.

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Celli, Silvia. "Introduction." In Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33124-5_1.

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Celli, Silvia. "Propagation and Radiation of Accelerated Particles in Supernova Remnants with Clumpy Structures." In Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33124-5_2.

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Celli, Silvia. "Particle Escape from Supernova Remnants." In Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33124-5_3.

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Celli, Silvia. "The Galactic Center Region." In Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33124-5_4.

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Celli, Silvia. "Summary and Conclusions." In Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33124-5_6.

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The, Lih-Sin, Donald D. Clayton, and Adam Burrows. "X-Ray and Gamma-Ray Signatures of Wolf-Rayet Supernova Explosions." In Wolf-Rayet Stars and Interrelations with other Massive Stars in Galaxies. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3306-7_94.

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Meyer, Bradley S., and W. Michael Howard. "Possible Gamma-Ray Signatures of an r-Process Event." In Supernovae. Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4612-2988-9_92.

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Slane, Patrick, Andrei Bykov, Donald C. Ellison, Gloria Dubner, and Daniel Castro. "Supernova Remnants Interacting with Molecular Clouds: X-Ray and Gamma-Ray Signatures." In Space Sciences Series of ISSI. Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3547-5_6.

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Conference papers on the topic "Gamma ray signatures"

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Hernanz, Margarita. "Gamma-ray signatures of classical novae." In GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP, 2001. http://dx.doi.org/10.1063/1.1419453.

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Nomoto, Ken’ichi. "Gamma-ray signatures of supernovae and hypernovae." In GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP, 2001. http://dx.doi.org/10.1063/1.1419452.

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Zhang, Bing. "Continuously-fed fireballs and signatures in gamma-ray burst afterglows." In GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP, 2001. http://dx.doi.org/10.1063/1.1419398.

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Zhang, Bing. "GeV and X-ray inverse Compton and proton synchrotron signatures in gamma-ray burst afterglows." In GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP, 2001. http://dx.doi.org/10.1063/1.1419392.

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Murase, Kohta, Kunihito Ioka, Shigehiro Nagataki, M. Galassi, David Palmer, and Ed Fenimore. "Pair-Signatures and High-Energy Gamma-Ray Emission from Gamma-Ray Bursts." In GAMMA-RAY BURSTS 2007: Proceedings of the Santa Fe Conference. AIP, 2008. http://dx.doi.org/10.1063/1.2943487.

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Böttcher, Markus, Matthew G. Baring, and Errol J. Summerlin. "Signatures of relativistic shock acceleration in blazar emission." In HIGH ENERGY GAMMA-RAY ASTRONOMY: 5th International Meeting on High Energy Gamma-Ray Astronomy. AIP, 2012. http://dx.doi.org/10.1063/1.4772337.

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Baring, Matthew G. "High-energy spectral signatures in gamma-ray bursts." In GeV-TeV gamma ray astrophysics workshop. AIP, 2000. http://dx.doi.org/10.1063/1.1291373.

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Sahin*, A., and M. O. Abouelresh. "Spectral Gamma Ray Signatures for Qusaiba Shale." In Second EAGE/SPE/AAPG Shale Gas Workshop in the Middle East. EAGE Publications BV, 2014. http://dx.doi.org/10.3997/2214-4609.20142263.

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"Searching dark matter signatures from the Virgo cluster with HAWC." In HIGH ENERGY GAMMA-RAY ASTRONOMY: 6th International Meeting on High Energy Gamma-Ray Astronomy. Author(s), 2017. http://dx.doi.org/10.1063/1.4968993.

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Mészáros, P., та M. J. Rees. "Shock models and O, X, γ signatures of gamma-ray burst sources". У Gamma-ray bursts: Second workshop. AIP, 1994. http://dx.doi.org/10.1063/1.45858.

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Reports on the topic "Gamma ray signatures"

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Karpius, Peter Joseph. The Nuclear Fuel Cycle and Associated Gamma-Ray Signatures. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1225591.

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Karpius, Peter Joseph, and Steven Charles Myers. Special Nuclear Material Gamma-Ray Signatures for Reachback Analysts. Office of Scientific and Technical Information (OSTI), 2016. http://dx.doi.org/10.2172/1312618.

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Lee, A. Intrinsic and cosmological signatures in gamma-ray burst time profiles: Time dilation. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/753295.

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Kocevski, Daniel, and Vahe Petrosian. On The Lack of Time Dilation Signatures in Gamma-ray Burst Light Curves. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1074191.

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