【作者】 徐树威； 李占奎； 谢元祥； 黄文学； 舒能川； 陈永寿； 许甫荣； 王鲲；

【Author】 XU Shu-Wei LI Zhan-Kui XIE Yuan-Xiang HUANG Wei-Xue SHU Neng-Chuan CHEN Yong-Shou XU Fu-Rong WANG Kun (Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China) (Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China) (Department of Technical Physics, Peking University, Beijing 100871, China) (Shanghai Institute for Nuclear Research, Shanghai 201800, China)

【机构】 中国科学院近代物理研究所； 中国原子能科学研究院核物理研究所； 北京大学技术物理系； 上海原子核研究所；

【摘要】 简要回顾了实验小组在过去8年中获得的实验结果,即采用氨喷嘴快速带传输系统+“P- γ”符合方法,在稀土区质子滴线附近首次观测了9种新核素的β缓发质子衰变,在A=90核区的N=Z线附近获得了5种核素的β缓发质子衰变的新数据．并把这14种核素的半衰期,自旋宇称,形变以及生成反应截面的实验值与流行的核模型理论预言进行了系统地对比讨论．从中看出:(1)85Mo,92Rh以及“等待点”核89Ru和93pd半衰期的实验值比近期Moller等人的宏观微观理论预言值[At．Data Nucl Data Tables,66,131(1997)]长5-10倍,因而明显地影响天体rp过程生成的核素丰度;(2)实验指认的质子滴线核142Ho和128pm的自旋宇称与流行理论预言不符,但用Woods-Saxon-Strutinsky方法可以计算得到相符的位能面;(3)实验估计的9种稀土核的生成截面比通用的Alice和HIVAP程序的计算值要小1-2个数量级．更多还原

【Abstract】 The experimental study on β -delayed proton decays near the proton drip line published by our group over the last 8 years were reviewed and summarized briefly, including first observation of 9 precursors in the rare-earth region and new measurements of 5 nuclei in the mass-90 region near N = Z line with the aid of the "p-γ" coincidence in combination with a He-jet tape transport system. Systematically comparing the experimental data with the current nuclear-model predictions, following points were represented. (1) the experimental half-lives for 85Mo and 92Rh as well as the predicted "waiting point" nuclei 89Ru and 93Pd are 5-10 times longer than the macroscopic-microscopic model predictions given by Moller et al [At. Data Nucl Data Tables, 66, 131(1997)]. It considerably influences the prediction of mass abundances of the nuclides produced in rp-process. (2) The current-model predictions are not consistent with the experimental spin-parity assignments of the proton drip-line nuclei 142Ho and 128Pm. However, the nuclear potential energy surface (PES) calculated by using a Woods-Saxon-Strutinsky method reproduced the experimental results. (3) The Alice code overestimated the production reaction cross sections of the studied 9 rare-earth nuclei by one order of magnitude or two, while HIVAP code overestimated them by one order of magnitude approximately.更多还原