arXiv 1503.018532015-03-06nucl-ex

用于检验天体物理速率预测的铒同位素（α，n）反应截面的测量

Measurement of (alpha,n) reaction cross sections of erbium isotopes for testing astrophysical rate predictions

G. G Kiss, T. Szücs, T. Rauscher, Zs Török, L. Csedreki, Zs Fülöp, Gy Gyürky, Z. Halász

发表信息：: J. Phys. G: Nucl. Part. Phys. 42 (2015) 055103 (10pp)
DOI：: 10.1088/0954-3899/42/5/055103

摘要：

核心坍缩和/或Ia型超新星爆炸中的$γ$过程被认为可以解释大多数所谓的$p$核（Se和Hg之间的35种富含质子的同位素）的起源。$γ$ -工艺反应网络研究的反应速率必须使用Hauser-Feshbach统计模型计算进行预测。最近的调查表明，在预测的$α$ -宽度在天体物理能量，这是一个重要的输入统计模型的问题。它对$p$核的上质量范围内的丰度预测的可靠性有影响。随着测量的$^{164,166}$ Er（$α$，n）$^{167,169}$ Yb反应截面的能量接近天体物理学相关的能量范围内，我们测试了最近提出的低能量修改的$α$ +原子核光学势的质量区域中，$γ$ -过程计算表现出生产不足的$p$核。对$α$ -宽度使用相同的光学势，该光学势是从组合的$^{162}$ Er（$α$，n）和$^{162}$ Er（$α$，$γ$）测量得到的，这使得需要对光学$α$ +核势进行低能修改是合理的。

英文摘要：

The $γ$-process in core-collapse and/or type Ia supernova explosions is thought to explain the origin of the majority of the so-called $p$ nuclei (the 35 proton-rich isotopes between Se and Hg). Reaction rates for $γ$-process reaction network studies have to be predicted using Hauser-Feshbach statistical model calculations. Recent investigations have shown problems in the prediction of $α$-widths at astrophysical energies which are an essential input for the statistical model. It has an impact on the reliability of abundance predictions in the upper mass range of the $p$ nuclei. With the measurement of the $^{164,166}$Er($α$,n)$^{167,169}$Yb reaction cross sections at energies close to the astrophysically relevant energy range we tested the recently suggested low energy modification of the $α$+nucleus optical potential in a mass region where $γ$-process calculations exhibit an underproduction of the $p$ nuclei. Using the same optical potential for the $α$-width which was derived from combined $^{162}$Er($α$,n) and $^{162}$Er($α$,$γ$) measurement makes it plausible that a low-energy modification of the optical $α$+nucleus potential is needed.

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