首次完整描述 $^{254}$No:超重核结构研究的新范例

D. D. Dao, F. Nowacki
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引用次数: 0

摘要

在这封信中,我们报告了应用壳模型框架描述重变形原子核的超越均值场方法的最新进展。我们在投影后变异(VAP)方案中扩展了最近的 DNO-SM 方法,称之为 DNO-SM(VAP)。与目前核理论建模中常用的 "投影后变异"(PAV)方案相比,这种方法能够更有效地捕捉先验相关性。利用郭-赫林有效相互作用,我们首先系统地比较了一些质量从 $A=251$ 到 $A=256$ 的代表性原子核的结合能、对比谱和电磁矩,从而检验了这种扩展方法。结果表明,与 PAV 方案相比,VAP 方案的变化提供了更多的约束解,反映了捕捉到的额外相关性。然后,我们重点研究了 $^{254}$No,它是实验研究最多的元素之一,可被视为通向超重区的入口。计算结果与完整的已知实验光谱(yrast 带、同分异构体带和 K 带)惊人地一致,为了解其外壳结构提供了新的视角。目前的成功描述为即将开展的重核和超重核光谱研究开辟了新的道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
First complete shell-model description of $^{254}$No: a new paradigm for superheavy nuclear structure studies
In this letter, we report the latest developments in the beyond mean-field methods applied to the shell-model framework for the the description of heavy deformed nuclei. We extend our recent DNO-SM approach within the Variation-After-Projection (VAP) scheme, dubbed as DNO-SM(VAP). This approach naturally enables to a priori capture correlations more efficiently than the Projection-After-Variation (PAV) scheme which is commonly used in current theoretical modelings of nuclei. Using the Kuo-Herling effective interaction, we first examine the extended method by a systematic comparison of the binding energies, the yrast spectra and electromagnetic moments of some representative nuclei of masses ranging from $A=251$ to $A=256$. The results show that the VAP scheme variationally provides more bound solutions with respect to the PAV scheme, reflecting the additional correlations that were captured. Both spectra, dipole and spectroscopic quadrupole moments are reproduced favorably. We then focus on the case of $^{254}$No, one of the most studied elements experimentally, which can be considered as the portal to the superheavy region. The calculations show a striking agreement with the complete experimentally known spectroscopy: the yrast band, the isomers and K bands, providing new insights into its shell structure. The present successful description opens a new way for forthcoming spectroscopic studies of heavy and superheavy nuclei.
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