偶-偶核α衰变半衰期的变形双势

作者：科学网 小柯机器人 发布时间：2025/9/28 9:41:49

近日，南京大学贺晓涛团队研究了偶-偶核α衰变半衰期的变形双势。2025年9月23日，《中国物理C》杂志发表了该成果。

研究组系统地分析了195个偶-偶核的α-衰变半衰期（TPA）。采用diffthemeness参数固定的cosh势作为核势，其变形参数取自FRDM、WS4和DRHBc模型。均方根偏差（RMSD）分别从0.515降至0.385、0.401和0.436，表明加入核变形后的TPA能够准确再现实验α-衰变半衰期。

此外，通过拟合不同质量区域的差异度参数，RMSD进一步降低，分别从0.385降至0.330，从0.401降至0.343，从0.436降至0.363。此外，结合拟合的差度参数，将变形的TPA扩展到预测Z = 118和120的偶偶核α-衰变半衰期。结果表明，N = 184可能是继N = 126之后的下一个中子幻数。

附：英文原文

Title: Investigation of the α-decay half-lives for even-even nuclei within a deformed two-potential approach

Author: Hong-Qiang You, Ren-Hang Wu, Shuang-Shuang Zhang, Xiao-Tao He

Issue&Volume: 2025-9-23

Abstract: In this study, we systematically investigate the α-decay half-lives of 195 even-even nuclei using a deformed two-potential approach (TPA). The cosh potential with fixed diffuseness parameter is adopted as the nuclear potential, for which deformation parameters are taken from the FRDM, WS4, and DRHBc models. The root mean square deviations (RMSD) decrease from 0.515 to 0.385, 0.401, and 0.436, respectively, indicating that incorporating nuclear deformations allows the deformed TPA to accurately reproduce experimental α-decay half-lives. Furthermore, by fitting the diffuseness parameter across various mass regions, the RMSD is further reduced, from 0.385 to 0.330, 0.401 to 0.343, and 0.436 to 0.363. Additionally, the deformed TPA, combined with the fitted diffuseness parameter, is extended to predict the α-decay half-lives of even-even nuclei with Z = 118 and 120. The results suggest that N = 184 may be the next neutron magic number, following N = 126.

DOI: 10.1088/1674-1137/ae0430

Source: http://hepnp.ihep.ac.cn/article/doi/10.1088/1674-1137/ae0430