Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376..701f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, Aug. 1, 1991, p. 701-716. Research supported by Lawrence Livermore Nat
Astronomy and Astrophysics
Astrophysics
20
Neutrinos, Nuclear Interactions, Stellar Cores, Gravitational Collapse, Nuclear Astrophysics, Supernovae
Scientific paper
Neutral current neutrino-nucleus interactions of interest in the supernova problem are investigated: endothermic and exothermic inelastic neutrino scattering processes; deexcitation of hot nuclei into neutrino pairs; and neutrino-antineutrino annihilation processes involving nuclei. A shell model-based treatment including allowed and forbidden transitions to compute the relevant weak strength distributions in nuclei is used. Fermi gas fitting formulas are discussed for the differential cross sections of all four processes for use in numerical stellar collapse calculations. Since target nuclei in stellar collapse are expected to be in highly excited states, thermal effects are included explicitly in these calculations. Low-energy neutrino-pair production from hot nuclei and exothermic neutrino-nucleus scattering may have an important role in determining the evolution of the lepton distribution functions in the infalling presupernova core.
Fuller George M.
Meyer Bradley S.
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