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  2. Ultra-high-energy gamma ray - Wikipedia

    en.wikipedia.org/wiki/Ultra-high-energy_gamma_ray

    Ultra-high-energy gamma rays are gamma rays with photon energies higher than 100 TeV (0.1 PeV). They have a frequency higher than 2.42 × 10 28 Hz and a wavelength shorter than 1.24 × 10 −20 m. The existence of these rays was confirmed in 2019. [ 1 ]

  3. Very-high-energy gamma ray - Wikipedia

    en.wikipedia.org/wiki/Very-high-energy_gamma_ray

    Very-high-energy gamma ray (VHEGR) denotes gamma radiation with photon energies of 100 GeV (gigaelectronvolt) to 100 TeV (teraelectronvolt), i.e., 10 11 to 10 14 electronvolts. [1] This is approximately equal to wavelengths between 10 −17 and 10 −20 meters, or frequencies of 2 × 10 25 to 2 × 10 28 Hz.

  4. Gamma ray - Wikipedia

    en.wikipedia.org/wiki/Gamma_ray

    The energy spectrum of gamma rays can be used to identify the decaying radionuclides using gamma spectroscopy. Very-high-energy gamma rays in the 100–1000 teraelectronvolt (TeV) range have been observed from astronomical sources such as the Cygnus X-3 microquasar.

  5. Commonly used gamma-emitting isotopes - Wikipedia

    en.wikipedia.org/wiki/Commonly_used_gamma...

    It has a half-life of 30 years, and decays by beta decay without gamma ray emission to a metastable state of barium-137 (137m Ba). Barium-137m has a half-life of a 2.6 minutes and is responsible for all of the gamma ray emission in this decay sequence. The ground state of barium-137 is stable. The photon energy (energy of a single gamma ray) of ...

  6. GRB 221009A - Wikipedia

    en.wikipedia.org/wiki/GRB_221009A

    The burst saturated the Fermi Gamma-ray Space Telescope's detector, [17] which captured gamma ray photons with energies exceeding 100 GeV. [18] GRB 221009A is by far the most productive event for very high-energy photons ever witnessed by scientific instrumentation.

  7. Photodisintegration - Wikipedia

    en.wikipedia.org/wiki/Photodisintegration

    Terrestrial lightnings produce high-speed electrons that create bursts of gamma-rays as bremsstrahlung. The energy of these rays is sometimes sufficient to start photonuclear reactions resulting in emitted neutrons. One such reaction, 14 7 N (γ,n) 13 7 N, is the only natural process other than those induced by cosmic rays in which 13 7 N is ...

  8. High Energy Stereoscopic System - Wikipedia

    en.wikipedia.org/wiki/High_Energy_Stereoscopic...

    High Energy Stereoscopic System (H.E.S.S.) is a system of imaging atmospheric Cherenkov telescopes (IACTs) for the investigation of cosmic gamma rays in the photon energy range of 0.03 to 100 TeV. The acronym was chosen in honour of Victor Hess, who was the first to observe cosmic rays.

  9. GRB 080916C - Wikipedia

    en.wikipedia.org/wiki/GRB_080916C

    The 16.5-second delay for the highest-energy gamma ray observed in this burst is consistent with some theories of quantum gravity, which state that all forms of light may not travel through space at the same speed. Very-high-energy gamma rays may be slowed down as they propagate through the quantum turbulence of space-time. [6] [7]