β-Delayed Proton Decays Near the Proton Drip Line

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XU Shu-Wei, LI Zhang-Kui, XIE Yuan-Xiang, HUANG Wen-Xue, SHU Neng-Chuan, CHEN Yong-Shou, XU Fu-Rong and WANG Kun. β-Delayed Proton Decays Near the Proton Drip Line[J]. Chinese Physics C, 2004, 28(S1): 1-4.
XU Shu-Wei, LI Zhang-Kui, XIE Yuan-Xiang, HUANG Wen-Xue, SHU Neng-Chuan, CHEN Yong-Shou, XU Fu-Rong and WANG Kun. β-Delayed Proton Decays Near the Proton Drip Line[J]. Chinese Physics C, 2004, 28(S1): 1-4. shu
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Received: 2004-12-30
Revised: 1900-01-01
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β-Delayed Proton Decays Near the Proton Drip Line

    Corresponding author: XU Shu-Wei,
  • Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China3 Department of Technical Physics, Peking University, Beijing 100871, China4 Shanghai Institute for Nuclear Research, Shanghai 201800, China

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.

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