Observing Supernova Neutrino Light Curves with Super-Kamiokande. II. Impact of the Nuclear Equation of State
Observing Supernova Neutrino Light Curves with Super-Kamiokande. II. Impact of the Nuclear Equation of State
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DOI：
10.3847/1538-4357/ac3ae2
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
K. Nakazato;F. Nakanishi;M. Harada;Y. Koshio;Y. Suwa;K. Sumiyoshi;A. Harada;M. Mori;R. Wendell
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文献类型：
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作者：
K. Nakazato;F. Nakanishi;M. Harada;Y. Koshio;Y. Suwa;K. Sumiyoshi;A. Harada;M. Mori;R. Wendell
利用原中子星（PNS）冷却的模拟结果，对超级神冈超新星中微子事件速率的后期演化进行了评估。在本工作中，我们扩展了Suwa等人的结果，他们研究了中微子事件率与PNS质量的依赖关系，但重点关注了核状态方程（EOS）的影响。我们发现，中微子事件率取决于高密度和低密度EOS，前者决定了PNS的半径，后者影响其表面温度。在现有中微子事件率评价的基础上，提出了一种考虑观测统计误差的中微子平均能量时变分析方法。
The late-time evolution of the neutrino event rate from supernovae is evaluated for Super-Kamiokande using simulated results of proto-neutron star (PNS) cooling. In the present work, we extend the result of Suwa et al., who studied the dependence of the neutrino event rate on the PNS mass, but focus on the impact of the nuclear equation of state (EOS). We find that the neutrino event rate depends on both the high-density and low-density EOS, where the former determines the radius of the PNS and the latter affects its surface temperature. Based on the present evaluation of the neutrino event rate, we propose a new analysis method to extract the time variability of the neutrino average energy taking into account the statistical error in the observation.