The effects of neutrino transport on the collapse of iron stellar cores

Details The effects of neutrino transport on the collapse of iron stellar cores The effects of neutrino transport on the collapse of iron stellar cores

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt........12m&link_type=abstract

Ph.D. Thesis Pennsylvania Univ., Philadelphia.

Other

Collapse, Neutrinos, Particle Interactions, Stellar Evolution, Transport Properties, Computerized Simulation, Electron Capture, Equations Of State, Hydrodynamics, Inelastic Scattering, Iron, Stellar Cores

Scientific paper

A multigroup flux-limited diffusion approximation to neutrino transport, correct to first order in material velocities, is developed and the neutrino-matter interactions important to stellar collapse are described. Applied as part of a hydrodynamic computer simulation using the Illinois equation of state, stellar collapse has been calculated for a variety of initial conditions and input physics. We report here on a comparison between iron cores of medium and high mass. We also study the role of neutrino-electron scattering in determining the amount of electron capture and neutrino loss from the core. In order to model this inelastic scattering, a modified Fokker-Planck approximation is used, in which adjacent neutrino energy groups are coupled. Such a treatment is numerically efficient and leads to the same final results as more accurate calculations of the same process. The moderate deleptonization obtained during infall (the lepton fraction YL = 0.33x0.38 at core bounce) restricts homologous core masses to less than 0.8 solar mass. With 0.6 to 0.8 solar mass of outer core to traverse, nuclear dissociation alone stalls the shock waves produced at core bounce. In addition, neutrino energy losses remove at least another 4 x 10 to the 51st power ergs. In no case is matter ejected promply as a direct result of the initial shock wave.

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