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Title: Neutrino-driven supernovae: Boltzmann neutrino transport and the explosion mechanism

Neutrino-driven supernovae: Boltzmann neutrino transport and the explosion mechanism Core-collapse supernovae are, despite their spectacular visual display, neutrino events. Virtually all ({approximately}99%) of the 10{sup 53} power ergs of gravitational binding energy released in the formation of the nascent neutron star is carried away in the form of neutrinos and antineutrinos of all three flavors, and these neutrinos are primarily responsible for powering the explosion. This mechanism depends sensitively on the neutrino transport between the neutrinospheres and the shock. In light of this, the authors have performed a comparison of multigroup Boltzmann neutrino transport (MGBT) and (Bruenn`s) multigroup flux-limited diffusion (MGFLD) in post-core bounce environments. Their analysis concentrates on those quantities central to the postshock matter heating stemming from electron neutrino and antineutrino absorption, namely the neutrino luminosities, RMS energies, and mean inverse flux factors. The authors show that MGBT yields mean inverse flux factors in the gain region that are {approximately}25% larger and luminosities that are {approximately}10% larger than those computed by MGFLD. Differences in the mean inverse flux factors, luminosities, and RMS energies translate to heating rates that are up to 2 times larger for Boltzmann transport, with net cooling rates below the gain radius that are typically {approximately}0.8 times the MGFLD rates. These differences are greatest more » at earlier postbounce times for a given progenitor mass, and for a given postbounce time, greater for greater progenitor mass. The increased differences with increased progenitor mass suggest that the net heating enhancement from MGBT is potentially robust and self-regulated. « less
Authors: ; ; ;
Publication Date:
OSTI Identifier:672056
Report Number(s):ORNL/CP--98110; CONF-971208--
ON: DE98005656; TRN: AHC2DT07%%215
DOE Contract Number:AC05-96OR22464
Resource Type:Conference
Data Type:
Resource Relation:Conference: 2. Oak Ridge symposium on atomic and nuclear astrophysics, Oak Ridge, TN (United States), 2-6 Dec 1997; Other Information: PBD: Dec 1997
Research Org:Oak Ridge National Lab., TN (United States)
Sponsoring Org:USDOE Office of Energy Research, Washington, DC (United States)
Country of Publication:United States
Language:English
Subject: 66 PHYSICS; SUPERNOVAE; NEUTRINOS; ANTINEUTRINOS; ENERGY TRANSFER; RADIATION TRANSPORT; BOLTZMANN EQUATION; GRAVITATIONAL COLLAPSE; SHOCK WAVES; LUMINOSITY; HEATING