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Title: A new equation of state with light nuclei and their weak interactions in core-collapse supernova simulations

We perform numerical experiments to investigate the influence of inelastic neutrino reactions with light nuclei on the standing accretion shock instability. The time evolutions of shock waves are calculated with a simple light-bulb approximation for the neutrino transport and a multi-nuclei equation of state. The neutrino absorptions and inelastic interactions with deuterons, tritons, helions and alpha particles are taken into account in the hydrodynamical simulations in addition to the ordinary charged-current interactions with nucleons. Axial symmetry is assumed but no equatorial symmetry is imposed. We show that the heating rates of deuterons reach as high as ∼ 10% of those of nucleons around the bottom of the gain region. On the other hands, alpha particles heat the matter near the shock wave, which is important when the shock wave expands and density and temperature of matter become low. It is also found that the models with heating by light nuclei have different evolutions from those without it in non-linear evolution phase. The matter in the gain region has various densities and temperatures and there appear regions that are locally rich in deuterons and alpha particles. These results indicate that the inelastic reactions of light nuclei, especially deuterons, should be incorporatedmore » in the simulations of core-collapse supernovae.« less
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555 (Japan)
  2. Yukawa Institute for Theoretical Physics, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502 (Japan)
  3. Numazu College of Technology, Ooka 3600, Numazu, Shizuoka 410-8501 (Japan)
  4. Faculty of Science and Technology, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510 (Japan)
Publication Date:
OSTI Identifier:
22280472
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1594; Journal Issue: 1; Conference: OMEG12: 12. international symposium on origin of matter and evolution of galaxies, Tsukuba (Japan), 18-21 Nov 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALPHA PARTICLES; ASTROPHYSICS; AXIAL SYMMETRY; CHARGED-CURRENT INTERACTIONS; COMPUTERIZED SIMULATION; DEUTERONS; EQUATIONS OF STATE; GRAVITATIONAL COLLAPSE; LIGHT NUCLEI; NEUTRINO REACTIONS; NEUTRINOS; NONLINEAR PROBLEMS; NUCLEONS; STAR EVOLUTION; SUPERNOVAE; TRITONS; WEAK INTERACTIONS