Comparison of Electron Capture Rates in the N = 50 Region using 1D Simulations of Core-collapse Supernovae
Comparison of Electron Capture Rates in the N = 50 Region using 1D Simulations of Core-collapse Supernovae
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DOI：
10.3847/1538-4357/ac9306
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
Z. Johnston;Sheldon Wasik;Rachel Titus;M. Warren;E. O’Connor;R. Zegers;S. Couch
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文献类型：
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作者：
Z. Johnston;Sheldon Wasik;Rachel Titus;M. Warren;E. O’Connor;R. Zegers;S. Couch
最近的研究强调了核心坍缩超新星（CCSNe）模型对N = 50闭壳区附近富中子核上的电子俘获（EC）速率的敏感性。在这项工作中，我们使用该地区最近更新的EC率对200颗恒星祖星进行了一套大型的一维CCSN模拟。为了进行比较，我们使用先前的两种EC速率实现重复模拟：参数化N = 50速率的微物理库（LMP）和较旧的独立粒子近似（IPA）。我们通过冲击恢复跟踪模拟，直到反弹后几秒钟，并表明EC速率对CCSN属性产生一致的印记，通常超过祖细胞本身的作用。显著的影响包括核心坍缩的时间尺度、内部核心在弹跳时的电子分数和质量、通过激波的吸积速率、复活的成功或失败以及中心致密残余物的性质。我们还比较了在类dune探测器中观测到的中子爆炸的中微子信号，并发现了对计数和平均能量的一致影响。总的来说，更新的速率导致的性能介于LMP和IPA之间，但比两者稍微更有利于爆炸。
Recent studies have highlighted the sensitivity of core-collapse supernovae (CCSNe) models to electron-capture (EC) rates on neutron-rich nuclei near the N = 50 closed-shell region. In this work, we perform a large suite of one-dimensional CCSN simulations for 200 stellar progenitors using recently updated EC rates in this region. For comparison, we repeat the simulations using two previous implementations of EC rates: a microphysical library with parametrized N = 50 rates (LMP), and an older independent-particle approximation (IPA). We follow the simulations through shock revival up to several seconds post-bounce, and show that the EC rates produce a consistent imprint on CCSN properties, often surpassing the role of the progenitor itself. Notable impacts include the timescale of core collapse, the electron fraction and mass of the inner core at bounce, the accretion rate through the shock, the success or failure of revival, and the properties of the central compact remnant. We also compare the observable neutrino signal of the neutronization burst in a DUNE-like detector, and find consistent impacts on the counts and mean energies. Overall, the updated rates result in properties that are intermediate between LMP and IPA, and yet slightly more favorable to explosion than both.