Hexadecapole strength in the rare isotopes 74,76Kr
Hexadecapole strength in the rare isotopes 74,76Kr
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DOI：
10.1016/j.physletb.2023.137932
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发表时间：
2023-04
影响因子：
4.4
通讯作者：
M. Spieker;S. Agbemava;Dominique Bazin;S. Cottle;P. Farris;A. Gade;T. Ginter;S. Giraud;K. Kemper;J. Li;W. Nazarewicz;S. Noji;J. Pereira;L. Riley;M. Smith;D. Weisshaar;R. Zegers
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文献类型：
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作者：
M. Spieker;S. Agbemava;Dominique Bazin;S. Cottle;P. Farris;A. Gade;T. Ginter;S. Giraud;K. Kemper;J. Li;W. Nazarewicz;S. Noji;J. Pereira;L. Riley;M. Smith;D. Weisshaar;R. Zegers
在Ge-Sr质量区，已知中子数N≤40的同位素具有随核子数和角动量快速变化的特征。为了获得对其结构的新认识，对稀有同位素74,76 Kr进行了逆运动学非弹性质子散射实验，重点研究了与Kr同位素的J π= 41 +态有关的观测值，特别是对六进位自由度的观测值。通过耦合通道计算，从非弹性质子散射截面上确定了74,76 Kr的J π= 41 +态的十六极形变参数β 4。找到了两种可能的耦合通道解。与核能密度泛函理论的预测相比，使用非相对论泛函和相对论泛函，明显倾向于大的，正的β 4解。这些β 4值明确地与变形良好的长形结构有关。考虑到在这项工作中建立的β 2 - β 4趋势，β 4值似乎可以提供核壳结构的敏感测量。
Abstract In the Ge-Sr mass region, isotopes with neutron number N≤ 40 are known to feature rapid shape changes with both nucleon number and angular momentum. To gain new insights into their structure, inelastic proton scattering experiments in inverse kinematics were performed on the rare isotopes 74, 76 Kr. This work focuses on observables related to the J π= 4 1+ states of the Kr isotopes and, in particular, on the hexadecapole degree of freedom. By performing coupled-channels calculations, hexadecapole deformation parameters β 4 were determined for the J π= 4 1+ states of 74, 76 Kr from inelastic proton scattering cross sections. Two possible coupled-channels solutions were found. A comparison to predictions from nuclear energy density functional theory, employing both non-relativistic and relativistic functionals, clearly favors the large, positive β 4 solutions. These β 4 values are unambiguously linked to the well deformed prolate configuration. Given the β 2− β 4 trend, established in this work, it appears that β 4 values could provide a sensitive measure of the nuclear shell structure.