First result from the Jinping Underground Nuclear Astrophysics experiment JUNA:precise measurement of the 92 keV 25Mg(p,γ)26Al resonance

• 作者: 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 Weiping Liu JUNA Collaboration
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: ARTICLES
• 页码范围: 125-132
• 页数: 8页
• 语种: 英文

摘要

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 reso-nance 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 under-ground 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-ray.The implication of the new rates for the understanding of other astrophysical situations is also discussed.