arXiv 1807.034412018-07-10nucl-thnucl-ex

$^{181}$ Ta俘获稳定的$^{39}$ K和富中子放射性$^{46}$ K的理论研究

Theoretical study of the capture of stable $^{39}$K and neutron-rich radioactive $^{46}$K by $^{181}$Ta

Bing Wang, Wei-Juan Zhao, En-Guang Zhao, Shan-Gui Zhou

备注：: 6 pages, 3 figures. Accepted for publication in PRC
DOI：: 10.1103/PhysRevC.98.014615

摘要：

用经验耦合通道模型和普适熔合函数公式分析了最近由A. Wakhle { \it等人} [Phys. Rev. C 97，021602（R）（2018）]。ECC模型的结果与${}^{39}$ K $+{}^{181}$ Ta的数据吻合得很好，而对于${}^{46}$ K $+{}^{181}$ Ta，ECC模型的预测高估了势垒以上俘获截面。比较这两个反应的简化数据，发现${}^{39}$ K $+{}^{181}$ Ta的势垒以上截面与UFF一致，且大于${}^{46}$ K $+{}^{181}$ Ta的势垒以上截面.这意味着${}^{46}$ K $+{}^{181}$ Ta的俘获截面在高于库仑势垒的能量处受到抑制。此外，在亚势垒能量下，${}^{39}$ K $+{}^{181}$ Ta的约化计算俘获截面略大于${}^{46}$ K $+{}^{181}$ Ta的约化计算俘获截面，这是由于与正$Q$值双中子转移通道的耦合.

英文摘要：

The empirical coupled-channel (ECC) model and the universal fusion function (UFF) prescription are used to analyse the data of capture cross sections for reactions ${}^{39}$K$+{}^{181}$Ta and ${}^{46}$K$+{}^{181}$Ta reported recently by A. Wakhle {\it et al.} [Phys. Rev. C 97, 021602(R) (2018)]. The results of the ECC model are in good agreement with the data of ${}^{39}$K$+{}^{181}$Ta while, for ${}^{46}$K$+{}^{181}$Ta, the predictions of the ECC model overestimate the above-barrier capture cross sections. Comparing the reduced data of these two reactions, it is found that the above-barrier cross sections of ${}^{39}$K$+{}^{181}$Ta are consistent with the UFF and are larger than those of ${}^{46}$K$+{}^{181}$Ta. This implies that the capture cross sections of ${}^{46}$K$+{}^{181}$Ta are suppressed at energies above the Coulomb barrier. Furthermore, at sub-barrier energies, the reduced calculated capture cross sections of ${}^{39}$K$+{}^{181}$Ta are a little larger than those of ${}^{46}$K$+{}^{181}$Ta, which is owing to the coupling to the positive $Q$-value two-neutron transfer channel.

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英文摘要：

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