致密星中的Nuclear fission反应模拟
Nuclear fission reaction simulations in compact stars
摘要：
Ia型超新星（SN Ia）是强大的恒星爆炸，在宇宙学中提供重要的距离指标。最近，我们提出了一个新的超新星Ia机制，涉及一个孤立的白矮星的核裂变链式反应[PRL 126，1311010]。在这里，我们执行新的反应网络模拟的锕系元素丰富的第一固体冷却白矮星。该网络包括一系列铀和钍同位素的中子俘获和裂变反应，这些同位素具有各种可能的铀-235富集值。我们发现，对于适度的U-235富集，在U-238和Th-232上的中子捕获可以产生额外的裂变核，使得所有U和Th核的显著部分可以在链式反应期间裂变。由此产生的巨大能量释放可能引发热核碳燃烧，并可能引发超新星Ia。
英文摘要：
Type-Ia supernovae (SN Ia) are powerful stellar explosions that provide important distance indicators in cosmology. Recently, we proposed a new SN Ia mechanism that involves a nuclear fission chain-reaction in an isolated white dwarf [PRL 126, 1311010]. Here we perform novel reaction network simulations of the actinide-rich first solids in a cooling white dwarf. The network includes neutron-capture and fission reactions on a range of U and Th isotopes with various possible values for U-235 enrichment. We find, for modest U-235 enrichments, neutron-capture on U-238 and Th-232 can breed additional fissile nuclei so that a significant fraction of all U and Th nuclei may fission during the chain-reaction. The resulting large energy release could ignite thermonuclear carbon burning and possibly trigger a SN Ia.
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