新的伽莫夫-泰勒强度对爆发型Ia超新星核合成的影响
Impact of New Gamow-Teller Strengths on Explosive Type Ia Supernova Nucleosynthesis
摘要：
最近的实验结果已经证实了可能的减少的GT $_+$强度的pf壳核。这些富含质子的核与Ia型超新星的爆燃和爆炸燃烧阶段有关。虽然先前的GT强度导致核合成预测的电子分数低于预期，但与先前的壳层模型预测相比，GT $_+$强度的降低可能导致电子分数略微增加，尽管增强不如先前的增强那么大，从Fuller，Fowler和Newman基于独立粒子模型计算的速率。一个壳模型参数化已经开发，更紧密地匹配实验GT的优势。由此产生的电子捕获率用于碳爆燃和爆炸阶段的Ia型超新星的核合成计算，并将最终的质量分数与使用更常用的速率获得的质量分数进行比较。
英文摘要：
Recent experimental results have confirmed a possible reduction in the GT$_+$ strengths of pf-shell nuclei. These proton-rich nuclei are of relevance in the deflagration and explosive burning phases of Type Ia supernovae. While prior GT strengths result in nucleosynthesis predictions with a lower-than-expected electron fraction, a reduction in the GT$_+$ strength can result in an slightly increased electron fraction compared to previous shell model predictions, though the enhancement is not as large as previous enhancements in going from rates computed by Fuller, Fowler, and Newman based on an independent particle model. A shell model parametrization has been developed which more closely matches experimental GT strengths. The resultant electron-capture rates are used in nucleosynthesis calculations for carbon deflagration and explosion phases of Type Ia supernovae, and the final mass fractions are compared to those obtained using more commonly-used rates.
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