THE INFLUENCE OF INELASTIC NEUTRINO REACTIONS WITH LIGHT NUCLEI ON THE STANDING ACCRETION SHOCK INSTABILITY IN CORE-COLLAPSE SUPERNOVAE
THE INFLUENCE OF INELASTIC NEUTRINO REACTIONS WITH LIGHT NUCLEI ON THE STANDING ACCRETION SHOCK INSTABILITY IN CORE-COLLAPSE SUPERNOVAE
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DOI：
10.1088/0004-637x/774/1/78
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发表时间：
2013-05
期刊：
影响因子：
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通讯作者：
S. Furusawa;H. Nagakura;K. Sumiyoshi;S. Yamada
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作者：
S. Furusawa;H. Nagakura;K. Sumiyoshi;S. Yamada
通过数值实验研究了轻核非弹性中微子反应对稳态吸积激波不稳定性的影响。用中微子输运的简单电灯泡近似和多核状态方程计算了激波的时间演化。在流体动力学模拟中，考虑了中微子的吸收以及与氘核、氚、负离子和α粒子的非弹性相互作用。此外，在模拟中还讨论了普通带电电流与核子相互作用的影响。假定轴对称，但不施加赤道对称。我们发现氘核的加热速率高达增益区底部附近核子的加热速率的10%。另一方面，α粒子在激波附近被加热，当激波膨胀、物质密度和温度变低时，这一点很重要。在SASI的非线性阶段，有轻核加热的模型与没有轻核加热的模型的演化方式不同。这一结果是因为增益区域中的物质具有不同的密度和温度，因此子区域似乎在局部富含氘核和α粒子。虽然轻核从来都不是主要的热源，而且它们在某些情况下有利于激波恢复，而在其他情况下则不利，但它们是不可忽视的，值得进一步研究。
We perform numerical experiments to investigate the influence of inelastic neutrino reactions with light nuclei on the standing accretion shock instability (SASI). The time evolution of shock waves is 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, the effects of ordinary charged-current interactions with nucleons is addressed in the simulations. 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 hand, alpha particles are heated near the shock wave, which is important when the shock wave expands and the density and temperature of matter become low. It is also found that the models with heating by light nuclei evolve differently in the non-linear phase of SASI than do models that lack heating by light nuclei. This result is because matter in the gain region has a varying density and temperature and therefore sub-regions appear that are locally rich in deuterons and alpha particles. Although the light nuclei are never dominant heating sources and they work favorably for shock revival in some cases and unfavorably in other cases, they are non-negligible and warrant further investigation.