annihilation radiation


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an·ni·hi·la·tion ra·di·a·tion

the radiation resulting when a positron from beta-positive decay comes to rest. It encounters an electron, and the two particles annihilate each other and convert their rest mass into two 0.51-MeV gamma rays emitted in exactly opposite directions. See: pair production.
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Although the source of the annihilation radiation is debatable, there is no dearth of candidates in the crowded environs of the galactic center.
Milky Way's heart gushes antimatter
Matter falling onto such a compact object would produce low-energy gamma rays, which in turn would generate the positrons needed to produce the annihilation radiation.
Researchers probe the 'Great Annihilator.' (mysterious celestial object that spews out photons may be a black hole)

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