利用（^7Li,^6Li）反应测量^15N（n,γ）^16N天体物理反应率

用Q3D磁谱仪测量了^15N（^7Li,^6Li）^16N布居^16N基态和前三个激发态的角分布。通过对实验数据的扭曲波玻恩近似（Distorted wave Born approximation,DWBA）分析,导出这些态的谱因子和渐进归一化系数（Asymptotic normalization coefficient,ANC）,进而用新的谱因子得到^15N（n,γ）^16N的天体物理反应率。结果表明,尽管15N为中子满壳核,但^16N中转移中子处于2s1/2轨道的两个能级并不是很好的单粒子能级,与壳模型的理论预言结论相反。...

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Published in核技术 Vol. 37; no. 10; pp. 59 - 64
Main Author 吴志丹 郭冰 李志宏 李云居 苏俊 庞丹阳 颜胜权 李二涛 白希祥 杜先超 樊启文 甘林 何建军 金孙均 景龙 李龙 李志常 连钢 刘建成 谌阳平 王友宝 于祥庆 曾晟 张立勇 张伟杰 柳卫平
Format Journal Article
LanguageChinese
Published 2014
Subjects
反应率
扭曲波玻恩近似
谱因子
转移反应
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Summary:用Q3D磁谱仪测量了^15N（^7Li,^6Li）^16N布居^16N基态和前三个激发态的角分布。通过对实验数据的扭曲波玻恩近似（Distorted wave Born approximation,DWBA）分析,导出这些态的谱因子和渐进归一化系数（Asymptotic normalization coefficient,ANC）,进而用新的谱因子得到^15N（n,γ）^16N的天体物理反应率。结果表明,尽管15N为中子满壳核,但^16N中转移中子处于2s1/2轨道的两个能级并不是很好的单粒子能级,与壳模型的理论预言结论相反。
Bibliography:WU Zhidan, GUO Bing, LI Zhihong, LI Yunju, SU Jun, PANG Danyang, YAN Shengquan, LI Ertao, BAI Xixiang, DU Xianchao, FAN Qiwen, GAN Lin, HE Jianjun, JIN Sunjun, JING Long, LI Long, LI Zhichang, LIAN Gang, LIU Jiancheng, SHEN Yangping, WANG Youbao, YU Xiangqing, ZENG Sheng, ZHANG Liyong, ZHANG Weijie, LIU Weiping（1China Institute of Atomic Energy, Beijing 102413, China; 2School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China; 3College of Physics Science and Technology, Shenzhen University, Shenzhen 518060, China; 4Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China）
31-1342/TL
Background： Fluorine （^19F, the only stable F isotope） is a crucial element for nucleosynthetic studies since it is extremely sensitive to the physical conditions within stars. The astrophysical site of the production of fluorine is suggested to be asymptotic giant branch stars where the ^15N（n,γ）^16N reaction could affect the abundance of fluorine by competing with ^15N（α,γ）^
ISSN:0253-3219