Neutrino halo effect on collective neutrino oscillation in iron core-collapse supernova model of a 9.6 M ⊙ star
Neutrino halo effect on collective neutrino oscillation in iron core-collapse supernova model of a 9.6 M ⊙ star
复制标题
9.6 M 恒星铁核塌陷超新星模型中中微子晕对集体中微子振荡的影响
DOI：
10.1088/1475-7516/2020/06/011
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发表时间：
2020
影响因子：
6.4
通讯作者：
Yoshida, Takashi
中科院分区：
文献类型：
--
作者：
Zaizen, Masamichi;Cherry, John F.;Takiwaki, Tomoya;Horiuchi, Shunsaku;Kotake, Kei;Umeda, Hideyuki;Yoshida, Takashi
我们扩展了多角度的计算框架，研究了中微子晕在铁核前驱核坍缩中的集体中微子振荡中的时间演化。我们发现，在本文所采用的9.6M⊙前驱粒子的情况下，中微子晕和集体中微子振荡的影响不是同时很大时，存在时间窗。在激波内部，与向外传播的中微子通量相比，向内散射的{晕中微子}的影响一般不能忽略。然而，在早期，集体中微子振荡被多角度物质抑制有效地关闭。在中期，集体中微子振荡没有被抑制，但它的起爆半径超过了仍然相对较小的爆发激波阵面，那里的晕很突出。我们还发现，在9.6M⊙前身的情况下，晕中微子在集体中微子振荡的开始时会产生延迟。这导致了新的风味转换，使集体中微子振荡光谱特征变得尖锐。我们预测，中微子晕效应的包含使中微子信号与热发射更明显地区别开来，而当晕中微子被省略时。
We extend the multi-angle computational framework and investigate the time evolution of the neutrino halo on collective neutrino oscillation in the core collapse of an iron core progenitor. We find that in the case of the 9.6 M⊙ progenitor adopted in this work, there are windows of time {when} the effects of neutrino halo and collective neutrino oscillation {are not simultaneously large}. Inside the shock, the impact of {the} inward-scattered {halo neutrino} cannot in general be neglected compared to the outward-propagating neutrino flux. However, during early epochs, collective neutrino oscillation is effectively shut down by multi-angle matter suppression. During the intermediate epoch, collective neutrino oscillation is {not} suppressed, but {its} onset radius is beyond the still relatively small explosion shock front where the halo is prominent. We also find {in the case of the 9.6 M⊙ progenitor} the halo neutrinos induce a delay {in} the onset of collective neutrino oscillations. This causes novel flavor conversions which sharpen collective neutrino oscillation spectral features. We predict that the inclusion of neutrino halo effects makes neutrino signals that are more clearly distinct from thermal emission that when halo neutrinos are omitted.