Neutrino processes of significance in stars

[摘要] The transition probabilities and rates ofdissipation ofenergy by the neutrino-antineutrino pairs are calculated for the processes: e^(-)+e^(+)→v+^(-/)v and e^(±)+y→e^(±) + v+^(-/)v, in the limit ofa nondegenerate electron gas. These quantities are also calculated for the process y+y→v +^(-/v) using a nonlocal weak interaction; the resultingmatrix elements arereduced by a symbol manipulation computer program. The energy dissipation rates for these processes, the urca process, and the pr ocesses e^(±)+(z,A)→e^(±)+(z,A)+v+^(-/)v and y+(z,A)→(z,A)+v+^(-/)v are compared. The process e^(+)+e^(-)→v+^(-/)v or e^(±)+y→e^(±)+v+^(-/)v is found to dominate in the range of temperatures and densities considered: 10^(8) °K ≤ T ≤5 x 10^(9)°K, 1gm/cm^(3) ≤ p ≤10^(6)gm/cm^(3).

[发布机构] University:California Institute of Technology;Department:Physics, Mathematics and Astronomy

[关键词] Physics