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Physics
High Energy, Nuclear, Particle Physics
Gamma absorption at increasing energy levels
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[QUOTE="snorkack, post: 6044005, member: 436348"] Which are main absorption modes of matter for gamma rays under about 500 MeV? And how strong is the absorption? For low energies (under 20 MeV) the mechanisms are: 1) Photoelectric absorption - all energies from eV range onwards 2) Compton scattering - all energies enough to displace the electron 3) Electron-positron pair production - starting at 1022 keV 4) Photonuclear absorption - beginning at 1,7 MeV for Be-9, and edges going on to about 20 MeV for He-4 But then on? How absorptive is matter in the range of 40...400 MeV? The next edges should be: 5) N+γ→N+π, from 140 MeV 6) Muon pair production, from 212 MeV+recoil, which is a lot 7) N+γ→Δ, about 300 MeV, but a broad one because Δ is a resonance, thus wide Is any of these edges distinguished by a significant intensity compared to the background level of absorption due to 1...4, between the 30...100 MeV range? [/QUOTE]
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High Energy, Nuclear, Particle Physics
Gamma absorption at increasing energy levels
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