Results 11 to 20 of about 3,889,913 (343)

The Gamma-ray Window to Intergalactic Magnetism [PDF]

open access: yesUniverse, 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   +2 more sources

Gamma-Ray Bursts [PDF]

open access: yesStars and Stellar Processes, 2022
Gamma-ray bursts (GRB) are short and intense bursts of $\sim$100 keV$-$1MeV photons, usually followed by long-lasting decaying afterglow emission in a wide range of electromagnetic wavelengths from radio to X-ray and, sometimes, even to GeV gamma-rays.
Yu, Yun-Wei   +3 more
openaire   +3 more sources

First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies. [PDF]

open access: yesPhysical Review Letters, 2021
We report, for the first time, the long-awaited detection of diffuse gamma rays with energies between 100 TeV and 1 PeV in the Galactic disk. Particularly, all gamma rays above 398 TeV are observed apart from known TeV gamma-ray sources and compatible ...
M. Amenomori   +94 more
semanticscholar   +1 more source

Very high-energy gamma-ray emission beyond 10 TeV from GRB 221009A [PDF]

open access: yesScience Advances, 2023
The highest-energy gamma-rays from gamma-ray bursts (GRBs) have important implications for their radiation mechanism. Here we report the detection of gamma-rays up to 13 teraelectronvolts from the brightest GRB 221009A by the Large High Altitude Air ...
Z. Cao   +278 more
semanticscholar   +1 more source

Gamma Ray Spectrum by Software Methods for Radioactive Waste

open access: yesIraqi Journal of Industrial Research, 2023
The requirements of NTD (Neglected Tropical Diseases) and technological regulations for the operation of NPP (Nuclear Power Plant) power units (NP-001-97 (OPB-88/97), NP-082-07) define the requirements for monitoring the specific activity of iodine-131 (
M. W. Alhamd   +3 more
doaj   +1 more source

Peta–electron volt gamma-ray emission from the Crab Nebula [PDF]

open access: yesScience, 2021
High-energy photons from the Crab Nebula The Crab Nebula contains a pulsar that excites the surrounding gas to emit high-energy radiation. The combination of the pulsar's youth and nearby location makes the nebula the brightest gamma-ray source in the ...
Z. Cao   +270 more
semanticscholar   +1 more source

Bulk Density Response and Experimental Study of Pulsed Neutron-Gamma Density Logging

open access: yesFrontiers in Earth Science, 2022
The pulsed neutron-gamma density logging technique is used to measure the bulk density of formations based on the detection of gamma rays from the inelastic scattering of neutrons in the formations.
Hu Wang   +6 more
doaj   +1 more source

Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow. [PDF]

open access: yesScience, 2021
Gamma-ray bursts (GRBs), which are bright flashes of gamma rays from extragalactic sources followed by fading afterglow emission, are associated with stellar core collapse events.
H. Abdalla   +237 more
semanticscholar   +1 more source

On the Search for the Galactic PeVatrons by Means of Gamma-Ray Astronomy

open access: yesUniverse, 2022
Cosmic rays are ultra-relativistic particles that slam into the atmosphere from all directions in the sky. Gamma rays emitted when cosmic rays interact with Galactic gas and radiation fields are a powerful tool to investigate their origin. Many candidate
Sabrina Casanova
doaj   +1 more source

Constraints on the emitting region of the gamma-rays observed in GW170817 [PDF]

open access: yesMonthly notices of the Royal Astronomical Society, 2018
The gravitational waves from the neutron star merger event GW170817 were accompanied by an unusually weak short GRB 170817A, by an optical/IR macronova/kilonova and by a long lasting radio to X-rays counterpart.
T. Matsumoto, E. Nakar, T. Piran
semanticscholar   +1 more source

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