gamma ray

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gamma ray

[′gam·ə ‚rā]
(nuclear physics)
A high-energy photon, especially as emitted by a nucleus in a transition between two energy levels.
References in periodicals archive ?
Looking within a box 40[degrees] on a side centered on the galaxy's center, the team picked out about 100 point sources likely to be pulsars based on the shape of their gamma-ray spectra.
If you ranked all the explosions in the universe based on their power, gamma-ray bursts would be right behind the Big Bang.
They also indicate that the brightest X-ray emission occurs opposite the gamma-ray peak, so when one reaches maximum the other is at minimum.
The Italian Space Agency's AGILE gamma-ray satellite first reported the flare, followed by Fermi.
In the vicinity of a spinning supermassive black hole (billions of times heavier than our Sun) an enormous amount of energy is released, often in the most energetic form of light: high energy gamma-ray photons at mega- or even gigaelectronvolt (MeV/GeV) energies.
Either gamma-ray bursts cannot be the source of all ultrahigh energy cosmic rays, or there has to be some physics going on inside the gamma-ray burst that makes neutrino production different" from what scientists expected, says Abigail Vieregg, a physicist at the Harvard- Smithsonian Center for Astrophysics in Cambridge, Mass.
Spectral resolution refers to the sharpness of peaks in a gamma-ray spectrum.
It lasted for more than 23 minutes-700 times longer than the typical gamma-ray burst.
But what's truly extraordinary is that during the peak moment, the gamma-ray burst (GRB) outshines the rest of the universe in gamma rays, as seen from Earth
During its first year in orbit, GRO recorded gamma rays from quasars that lie between 10 billion and 20 billion light years from Earth and that emit 10 to 100 million times the total gamma-ray output of the Milky Way.
If this is true, this should lead to a gamma-ray excess - one that can't be explained as originating from any known phenomenon.