Results 41 to 50 of about 157,734 (293)
Particles, Strings and Cosmology (PASCOS 99), 2000 Ultra-high-energy, >10^19 eV, cosmic-ray and high energy, ~10^14 eV, neutrino production in GRBs is discussed in the light of recent GRB and cosmic-ray observations. Emphasis is put on model predictions that can be tested with operating and planned cosmic-ray and neutrino detectors, and on the prospects of testing for neutrino properties.
openaire +4 more sources
Long-term monitoring of the radio-galaxy M87 in gamma-rays: joint analysis of MAGIC, VERITAS and Fermi-LAT data [PDF]
arXiv, 2023 M87 was discovered in the very-high-energy band (VHE, E > 100 GeV) with HEGRA in 2003, long before its emission was detected in the high-energy band (HE, E > 100 MeV) with Fermi-LAT in 2009, opening the window to a new family of extragalactic sources with tilted jets.
arxiv
Observing Higgs boson production through its decay into gamma-rays: A messenger for Dark Matter candidates [PDF]
Physics Letters B723(2013)100-106, 2012 In this Letter, we study the gamma-ray signatures subsequent to the production of a Higgs boson in space by dark matter annihilations. We investigate the cases where the Higgs boson is produced at rest or slightly boosted and show that such configurations can produce characteristic bumps in the gamma-ray data.
arxiv +1 more source
The Gamma‐Ray Observatory [PDF]
Annals of the New York Academy of Sciences, 1989 AbstractThe Gamma-Ray Observatory (GRO), a Shuttle-launched free-flying Observatory is currently scheduled for launch in November 1990. The mission provides nearly six orders of magnitude in spectral coverage, from about 50 KeV to about 30 GeV, with a sensitivity over the entire range over an order of magnitude greater than that of previous ...
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Probit analysis and effect of electron beam and gamma rays in blackgram (Vigna mungo (L.) Hepper)
Electronic Journal of Plant Breeding, 2017 An experimental investigation was carried out to determine the lethal dose (LD50) of electron beam and gamma rays on two black gram varieties viz., MDU 1, VBN (Bg) 4. The lethal dose was determined by probit analysis. Dry seeds of both the varieties were
K. Veni +2 more
doaj +1 more source
The Gamma-ray Window to Intergalactic Magnetism
Universe, 2021 One of the most promising ways to probe intergalactic magnetic fields (IGMFs) is through gamma rays produced in electromagnetic cascades initiated by high-energy gamma rays or cosmic rays in the intergalactic space.
Rafael Alves Batista, Andrey Saveliev
doaj +1 more source
Gamma-ray binaries beyond one-zone models: an application to LS 5039 [PDF]
A&A 575, A112 (2015), 2014 Context: Several binary systems hosting massive stars present gamma-ray emission. In most of these systems, despite detailed observational information being available, the nature and the structure of the emitter are still poorly known. Aims: We investigate the validity of the so-called one-zone approximation for the high-energy emitter in binary ...
arxiv +1 more source
On the Detectability of Galactic Dark Matter Annihilation into Monochromatic Gamma-rays
, 2010 Monochromatic gamma-rays are thought to be the smoking gun signal for identifying the dark matter annihilation. However, the flux of monochromatic gamma-rays is usually suppressed by the virtual quantum effects since dark matter should be neutral and ...
Abdo A A +17 more
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Laue lenses for hard X-/soft Gamma-rays: new prototype results [PDF]
, 2011 We present the results obtained with the new Laue lens prototype built in the LARIX facility in the Physics Department of University of Ferrara. Following the results of the first prototype presented at the SPIE conference in Marseille, and also thanks to the methods adopted for improving the prototype (SPIE conference in San Diego, Ferrari et al. 2009)
arxiv +1 more source
Time-of-flight discrimination between gamma-rays and neutrons by neural networks
, 2012 In gamma-ray spectroscopy, a number of neutrons are emitted from the nuclei together with the gamma-rays and these neutrons influence gamma-ray spectra.
Akkoyun, Serkan
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