Measurements of $^{160}$Dy($p,\gamma$) at energies relevant for astrophysical $\gamma$ process
| Autor: | Cheng, Hao, Sun, Bao-Hua, Zhu, Li-Hua, Kusakabe, Motohiko, Zheng, Yun, He, Liu-Chun, Kajino, Toshitaka, Niu, Zhong-Ming, Li, Tian-Xiao, Li, Cong-Bo, Wang, Dong-Xi, Wang, Meng, Li, Guang-Shuai, Wang, Kang, Song, Lin, Guo, Ge, Huang, Zhi-Yong, Wei, Xiu-Lin, Zhao, Fu-WeI, Wu, Xiao-Guang, Abulikemu, Yimuran, Liu, Jian-Cheng, Fan, Ping |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | ApJ 915(2021)78 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-4357/ac00b1 |
| Popis: | Rare information on photodisintegration reactions of nuclei with mass numbers $A \approx 160$ at astrophysical conditions impedes our understanding of the origin of $p$-nuclei. Experimental determination of the key ($p,\gamma$) cross sections has been playing an important role to verify nuclear reaction models and to provide rates of relevant ($\gamma,p$) reactions in $\gamma$-process. In this paper we report the first cross section measurements of $^{160}$Dy($p,\gamma$)$^{161}$Ho and $^{161}$Dy($p,n$)$^{161}$Ho in the beam energy range of 3.4 - 7.0 MeV, partially covering the Gamow window. Such determinations are possible by using two targets with various isotopic fractions. The cross section data can put a strong constraint on the nuclear level densities and gamma strength functions for $A \approx$ 160 in the Hauser-Feshbach statistical model. Furthermore, we find the best parameters for TALYS that reproduce the A $\thicksim$ 160 data available, $^{160}$Dy($p,\gamma$)$^{161}$Ho and $^{162}$Er($p,\gamma$)$^{163}$Tm, and recommend the constrained $^{161}$Ho($\gamma,p$)$^{160}$Dy reaction rates over a wide temperature range for $\gamma$-process network calculations. Although the determined $^{161}$Ho($\gamma$, p) stellar reaction rates at the temperature of 1 to 2 GK can differ by up to one order of magnitude from the NON-SMOKER predictions, it has a minor effect on the yields of $^{160}$Dy and accordingly the $p$-nuclei, $^{156,158}$Dy. A sensitivity study confirms that the cross section of $^{160}$Dy($p$, $\gamma$)$^{161}$Ho is measured precisely enough to predict yields of $p$-nuclei in the $\gamma$-process. Comment: 12 pages,9 figures |
| Databáze: | arXiv |
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