μ and τ neutrino thermalization and production in supernovae: Processes and time scales

Todd A. Thompson, Adam Burrows, Jorge E. Horvath

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

We investigate the rates of production and thermalization of [Formula Presented] and [Formula Presented] neutrinos at temperatures and densities relevant to core-collapse supernovae and protoneutron stars. Included are contributions from electron scattering, electron-positron annihilation, nucleon-nucleon bremsstrahlung, and nucleon scattering. For the scattering processes, in order to incorporate the full scattering kinematics at arbitrary degeneracy, the structure function formalism developed by Reddy, Prakash, and Lattimer [Phys. Rev. D [Formula Presented] 013009 (1998)] and Burrows and Sawyer [Phys. Rev. C [Formula Presented] 554 (1998)] is employed. Furthermore, we derive formulas for the total and differential rates of nucleon-nucleon bremsstrahlung for arbitrary nucleon degeneracy in asymmetric matter. We find that electron scattering dominates nucleon scattering as a thermalization process at low neutrino energies [Formula Presented] but that nucleon scattering is always faster than or comparable to electron scattering above [Formula Presented] In addition, for [Formula Presented] and neutrino energies [Formula Presented] nucleon-nucleon bremsstrahlung always dominates electron-positron annihilation as a production mechanism for [Formula Presented] and [Formula Presented] neutrinos.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review C - Nuclear Physics
Volume62
Issue number3
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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