| 释义 |
annihilation radiation
annihilation radiation[ə‚nī·ə′lā·shən ‚rād·ē′ā·shən] (particle physics) Electromagnetic radiation arising from the collision, and resulting annihilation, of an electron and a positron, or of any particle and its antiparticle. annihilation radiation
an·ni·hi·la·tion ra·di·a·tionthe 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. |