1. First result from the Jinping Underground Nuclear Astrophysics experiment JUNA: precise measurement of the 92 keV 25Mg(p, γ)26Al resonance
- Author
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Jun Su, Hao Zhang, Zhihong Li, Paolo Ventura, Yunju Li, Ertao Li, Chen Chen, Yangping Shen, Gang Lian, Bing Guo, Xinyue Li, Liyong Zhang, Jianjun He, Yaode Sheng, Yinji Chen, Luohuan Wang, Long Zhang, Fuqiang Cao, Wei Nan, Weike Nan, Gexing Li, Na Song, Baoqun Cui, Lihua Chen, Ruigang Ma, Zhicheng Zhang, Taoyu Jiao, Bingshui Gao, Xiaodong Tang, Qi Wu, Jiaqing Li, Liangting Sun, Shuo Wang, Shengquan Yan, Junhui Liao, Youbao Wang, Sheng Zeng, Ding Nan, Qiwen Fan, Ningchun Qi, Wenliang Sun, Xuyuan Guo, Peng Zhang, Yunhua Chen, Yong Zhou, Jifang Zhou, Jinrong He, Changsong Shang, Mingchuan Li, Jianping Cheng, and Weiping Liu
- Subjects
Nuclear physics ,Physics ,Reaction rate ,Multidisciplinary ,COSMIC cancer database ,Nucleosynthesis ,Nuclear astrophysics ,China Jinping Underground Laboratory ,Resonance ,Ground state ,Galaxy - Abstract
The 25Mg(p, γ )26Al reaction plays an important role in the study of cosmic 1.809 MeV γ -ray as a signature of ongoing nucleosynthesis in the Galaxy. At astrophysical temperature around 0.1 GK, the 25Mg(p, γ )26Al reaction rates are dominated by the 92 keV resonance capture process. We report a precise measurement of the 92 keV 25Mg(p, γ )26Al resonance in the day-one experiment at Jinping Underground Nuclear Astrophysics experiment (JUNA) facility in the China Jinping Underground Laboratory (CJPL). The resonance strength and ground state feeding factor are determined to be 3.8 ± 0.3 ×10−10 eV and 0.66 ± 0.04 , respectively. The results are in agreement with those reported in the previous direct underground measurement within uncertainty, but with significantly reduced uncertainties. Consequently, we recommend new 25Mg(p, γ )26Al reaction rates which are by a factor of 2.4 larger than those adopted in REACLIB database at the temperature around 0.1 GK. The new results indicate higher production rates of 26gAl and the cosmic 1.809 MeV γ -rays. The implication of the new rates for the understanding of other astrophysical situations is also discussed.
- Published
- 2022
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