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单词 pair production
释义 pair production
The creation of an electron and a positron from a photon in a strong electric field, such as that surrounding an atomic nucleus. The electron and the positron each have a mass of about 9 × 10-31 kg, which is equivalent on the basis of the mass—energy equation (
E = mc2
) to a total of 16 × 10-14 J. The frequency, v, associated with a photon of this energy (according to
E = hv
) is 2.5 × 1020 Hz. Pair production thus requires photons of high quantum energy (Bremsstrahlung or gamma rays). Any excess energy is taken up as kinetic energy of the products
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更新时间:2025/6/22 17:49:14