Inelastic Neutrino Reactions with Light Nuclei and Standing Accretion Shock Instability in Core-Collapse Supernovae

6th Nuclear Physics in Astrophysics

物理学;天文学

Furusawa, S.^1,2 ; Nagakura, H.^3 ; Sumiyoshi, K.^4 ; Yamada, S.^1

Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo

169-8555, Japan^1

Center for Computational Astrophysics, National Astronomical Observatory of Japan, Mitaka, Tokyo

181-8588, 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, Shizuoka, Numazu

410-8501, Japan^4

关键词: Core collapse supernovae;    Different evolutions;    Equatorial symmetries;    Inelastic interaction;    Neutrino transport;    Nonlinear evolutions;    Numerical experiments;    Shock instabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/665/1/012070/pdf
DOI  :  10.1088/1742-6596/665/1/012070

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

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 incorporated in the simulations of core-collapse supernovae.