Effects of neutrino transport on the collapse of iron stellar cores
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. The author reports here on a comparison between iron cores of medium and high mass. He also discusses 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 Y/sub L/ = 0.33-0.38 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/sup 51/ ergs. In no case is matter ejected promptly as a direct result of the initial shock wave.
- Research Organization:
- Pennsylvania Univ., Philadelphia (USA)
- OSTI ID:
- 6845965
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
An Investigation of Neutrino-driven Convection and the Core Collapse Supernova Mechanism Using Multigroup Neutrino Transport
The interplay between proto{endash}neutron star convection and neutrino transport in core-collapse supernovae
Related Subjects
GENERAL PHYSICS
NEUTRINO-ELECTRON INTERACTIONS
STARS
GRAVITATIONAL COLLAPSE
NEUTRINO REACTIONS
ENERGY LOSSES
FOKKER-PLANCK EQUATION
IRON
DIFFERENTIAL EQUATIONS
ELEMENTS
EQUATIONS
INTERACTIONS
LEPTON REACTIONS
LEPTON-LEPTON INTERACTIONS
LOSSES
METALS
NUCLEAR REACTIONS
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE INTERACTIONS
TRANSITION ELEMENTS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources