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arXiv 2006.16181astro-ph.SRastro-ph.HEnucl-ex
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核塌缩超新星产生$γ$射线放射性同位素的反应速率敏感性

Reaction Rate Sensitivity of the Production of $γ$-ray Emitting Isotopes in Core-Collapse Supernova

Kirby Hermansen, Sean M. Couch, Luke F. Roberts, Hendrik Schatz, MacKenzie L. Warren

摘要:

核心坍缩超新星(CCSNe)中产生的放射性同位素提供了对驱动坍缩机制和元素丰度起源的潜在过程的有用见解。他们的研究汇集了主要的物理学研究,包括核反应速率的实验测量,天体物理建模和PDMATHAMM射线观测。在这里,我们确定了关键的核反应速率的可观察到的放射性同位素的核合成爆炸硅燃烧期间CCSNe。使用核反应网络计算器SkyNet和当前的REACLIB反应速率,我们演变的温度-密度-时间轮廓的最里面的$0.45~M_\odot$喷出物从核心的崩溃和爆炸的$12~M_\odot$明星。通过将3403个反应速率单独变化100倍,我们确定了141个反应,这些反应导致了感兴趣的同位素的显著差异,即$^{43}$ K、$^{47}$ Ca、$^{44,47}$ Sc、$^{44}$ Ti、$^{48,51}$ Cr、$^{48,49}$ V、$^{52,53}$ Mn、$^{55,59}$ Fe、$^{56,57}$ Co和$^{56,57,59}$ Ni。对于这些反应中的每一个,我们提出了一种新的方法来提取相关的同位素的核合成的温度范围内,得到的温度范围内的$T = 0.47$ $6.15~$ GK。将STARLIB反应速率不确定性的变化限制在$1σ$内,进一步将所识别的反应减少到48个关键速率,这可以用于指导未来的实验研究。完整结果以表格形式呈现。

英文摘要:

Radioactive isotopes produced in core-collapse supernovae (CCSNe) provide useful insights into the underlying processes driving the collapse mechanism and the origins of elemental abundances. Their study generates a confluence of major physics research, including experimental measurements of nuclear reaction rates, astrophysical modeling, and $γ$-ray observations. Here we identify the key nuclear reaction rates to the nucleosynthesis of observable radioactive isotopes in explosive silicon-burning during CCSNe. Using the nuclear reaction network calculator SkyNet and current REACLIB reaction rates, we evolve temperature-density-time profiles of the innermost $0.45~M_\odot$ ejecta from the core collapse and explosion of a $12~M_\odot$ star. Individually varying 3403 reaction rates by factors of 100, we identify 141 reactions which cause significant differences in the isotopes of interest, namely, $^{43}$K, $^{47}$Ca, $^{44,47}$Sc, $^{44}$Ti, $^{48,51}$Cr, $^{48,49}$V, $^{52,53}$Mn, $^{55,59}$Fe, $^{56,57}$Co, and $^{56,57,59}$Ni. For each of these reactions, we present a novel method to extract the temperature range pertinent to the nucleosynthesis of the relevant isotope; the resulting temperatures lie within the range $T = 0.47$ to $6.15~$GK. Limiting the variations to within $1σ$ of STARLIB reaction rate uncertainties further reduces the identified reactions to 48 key rates, which can be used to guide future experimental research. Complete results are presented in tabular form.

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