^(20)Mg β衰变谱学与^(15)O(α,γ)^(19)Ne反应（英文）  

Beta-decay Spectroscopy of ^(20)Mg and the Implications for ^(15)O(α,γ)^(19)Ne Reaction

作　　者：孙立杰[1] 徐新星[1] 林承键[1] 方德清[2] 王建松[3] 李智焕[4] 王玉廷[2] 李晶 杨磊[1] 马南茹[1] 王康 臧宏亮 王宏伟[2] 李琛[2] 施晨钟 聂茂武 李秀芳 李贺[2] 马军兵[3] 马朋[3] 金仕纶[3] 黄美容[3] 白真[3] 王建国[3] 杨峰[1] 贾会明[1] 张焕乔[1] 刘祖华[1] 包鹏飞[1] 王东玺 杨彦云[3] 周远杰 马维虎[3] 陈杰 马余刚[2] 张玉虎[3] 周小红[3] 徐瑚珊[3] 肖国青[3] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]中国科学院上海应用物理研究所,上海201800 [3]中国科学院近代物理研究所,兰州730000 [4]北京大学物理学院,北京100871

出　　处：《原子核物理评论》2017年第3期431-436,共6页Nuclear Physics Review

基　　金：National Basic Research Program of China(973 Program)(2013CB834404);National Natural Science Foundation of China(11375268,11475263,U1432246,U1432127,11505293,11635015)~~

摘　　要：^(15)O(α,γ)^(19)Ne(p,γ)^(20)Na反应链是高温CNO循环向快速质子俘获过程突破的一条关键路径,相关的反应率输入量可通过^(20)Mg的β衰变可布居^(19)Ne共振态并测量其衰变性质来获得。通过高效率高精度地测量^(20)Mgβ衰变中产生的质子与γ射线得到了^(20)Mg衰变的详细信息,并构建了完整的衰变纲图,还进行了^(19)Ne 4 033 keV共振态衰变性质的探索,获得了该态在^(20)Mgβ衰变中被布居的分支比上限。通过比^(20)Mg和^(20)O镜像能级跃迁的结果确认了同位旋非对称性,为检验相关理论模型提供了精确的实验数据。对于突破路径中有重要影响的^(19)Ne 4 033 keV共振态的性质,有待更高统计的实验进一步研究。The breakout from the hot CNO cycle to the rapid proton capture process can occur via the15^O（α, γ）19^ Ne（p, γ）20^ Na reaction sequence, and the β decay of20^ Mg can be used as an alternative method to characterize some specific resonances, which will provide detailed nuclear structure input for reaction rate calculations. The reliable information on the decay properties and structure of20^ Mg was obtained by measuring the emitted particles and γ-rays in the β decay with high efficiency and high resolution.Attempt was also made to search for the decay channels associated with the 4 033 keV resonance in19^ Ne.To test fundamental symmetries, the transitions in the mirror decays of20^ Mg and20^O were compared. The precise experimental data presented here would be important to constrain the theoretical calculations. It is desirable to clarify the astrophysically relevant problem by further experiments with improved statistics on the basis of the present work.

关 键 词：Β缓发质子衰变 快速质子俘获过程 质子-γ符合 镜像非对称性 

分 类 号：O571.5[理学—粒子物理与原子核物理]