摘要
核谱因子描述了单粒子轨道中核子的占有状态,在核结构和核天体物理中有重要的应用。目前国际上10Be中子谱因子的研究结果存在3倍左右的差异。本实验利用中国原子能科学研究院HI-13串列加速器的高灵敏度Q3D磁谱仪,对^(13)C(~9Be,^(10)Be)^(12)C反应角分布进行了精确测量。通过实验数据和扭曲波玻恩近似(DWBA)计算结果进行比较,导出了^(10)Be的中子谱因子。该结果与转动不变壳模型理论及曾敏尔等的评价结果基本一致。利用该结果可以得到~9Be(n,γ)^(10)Be的天体物理反应率,评价该反应在相关天体环境中对CNO循环种子核^(12)C的影响,为核结构和核天体物理提供可靠数据。
Spectroscopic factor describes the overlap between the initial and final states and gives some information on the occupancy of a given single-particle orbiting around nuclear. It plays an important role in a variety of topics on nuclear structure and nuclear astrophysics. Nowadays, several experiments have been performed to study the neutron spectroscopic factor of10^ Be, but the results have a big difference with each other.In order to clarify this discrepancy, new measurement is highly needed. In this work, the angular distribution of13^ C9 ^Be,10^Be12^C reaction was measured at the Q3 D magnetic spectrometer of the HI-13 tandem accelerator,China Institute of Atomic Energy, Beijing. And then, the neutron spectroscopic factor of10^ Be was derived by normalizing the calculational differential cross-sections with the distorted-wave Born approximation to the experimental data. The present value is in good agreement with that obtained by Tsang et al. and also in good agreement with that derived from translationary invariant shell model calculation. One can use this result to calculate the9 ^Be（n, γ）0^ Be reaction rates and calculate its influence to the production of12^C.
出处
《原子核物理评论》
CSCD
北大核心
2017年第3期446-449,共4页
Nuclear Physics Review
基金
国家自然科学基金资助项目(11505117
11490560
11475264
11321064
11375269
11605114)
国家重点基础研究发展计划(973计划)项目(2013CB834406)
国家重点研发计划项目(2016YFA0400502)
广东省自然科学基金资助项目(2015A030310012
2016A030310042)~~
关键词
扭曲波玻恩近似
中子谱因子
Q3D磁谱仪
distorted-wave born approximation
neutron spectroscopic factor
Q3D magnetic spectrometer
