Neutrino-induced neutral-current reaction cross sections for r-process nuclei

摘要

Neutrino-induced reactions play an important role during and after the r-process, if the latter occurs in an environment with extreme neutrino fluxes such as the neutrino-driven wind model or neutron star mergers. Recently we have evaluated the charged-current neutrino-nucleus cross sections relevant for r-process simulations. We extend our approach here to the neutral-current cross sections. Our tabulation considers neutron-rich nuclei with neutron numbers N = 41-135 and charge numbers Z = 21-82 and lists total as well as partial neutron spallation cross sections. The calculations have been performed within the random phase approximation considering multipole transitions with J less than or equal to 3 and both parities. The supernova neutrino spectrum is described by a Fermi-Dirac distribution with various temperature parameters between T = 2.8 MeV and T = 10 MeV and with the degeneracy parameters alpha = 0 and alpha = 3. (C) 2002 Elsevier Science (USA). [References: 13]