束内光谱法揭示了稀有同位素 62Cr 中相互竞争的核形状

IF 17.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Alexandra Gade, Brenden Longfellow, Robert V. F. Janssens, Duc D. Dao, Frédéric Nowacki, Jeffrey A. Tostevin, Akaa D. Ayangeakaa, Marshall J. Basson, Christopher M. Campbell, Michael P. Carpenter, Joseph Chung-Jung, Heather L. Crawford, Benjamin P. Crider, Peter Farris, Stephen Gillespie, Ava M. Hill, Silvia M. Lenzi, Shumpei Noji, Jorge Pereira, Carlotta Porzio, Alfredo Poves, Elizabeth Rubino, Dirk Weisshaar
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引用次数: 0

摘要

近几十年来,稀有同位素设施使人们能够对寿命短、富中子的原子核进行研究。它们的测量特性表明,与稳定核相比,在中子与质子比不平衡的情况下,核壳结构会发生变化。在核图中所谓的反转岛--例如在富中子核 32Mg、42Si 和 64Cr 周围--教科书上的核壳模型预测这些核会呈球形,因为它们的神奇中子数分别为 20、28 和 40。然而,这些区域的原子核在基态时却发生了变形。这些原子核岛的另一个特征是形状共存,即原子核会随着激发能量的变化而呈现不同的形状。在这里,我们通过观察 62Cr 中的激发 0+ 态为这一现象提供了证据,它距离中子数 N = 40 附近的反转岛中心有两个中子的距离。我们使用大规模壳模型计算来解释结果,并报告了对双魔核 60Ca 的推断。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

In-beam spectroscopy reveals competing nuclear shapes in the rare isotope 62Cr

In-beam spectroscopy reveals competing nuclear shapes in the rare isotope 62Cr

In recent decades, rare-isotope facilities have enabled the study of short-lived, neutron-rich nuclei. Their measured properties indicate that shell structure changes in the regime of unbalanced neutron-to-proton ratios compared with that of stable nuclei. In the so-called islands of inversion in the nuclear chart—around the neutron-rich nuclei 32Mg, 42Si and 64Cr, for example—the textbook shell model predicts spherical shapes due to the respective magic neutron numbers of 20, 28 and 40 of these nuclei. However, nuclei in these regions turn out to be deformed in their ground states. Another hallmark of these islands is shape coexistence, where a nucleus assumes different shapes with excitation energy. Here we present evidence for this phenomenon from the observation of an excited 0+ state in 62Cr, two neutrons away from the heart of the island of inversion around neutron number N = 40. We use large-scale shell-model calculations to interpret the results, and we report extrapolations for the doubly magic nucleus 60Ca.

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来源期刊
Nature Physics
Nature Physics 物理-物理:综合
CiteScore
30.40
自引率
2.00%
发文量
349
审稿时长
4-8 weeks
期刊介绍: Nature Physics is dedicated to publishing top-tier original research in physics with a fair and rigorous review process. It provides high visibility and access to a broad readership, maintaining high standards in copy editing and production, ensuring rapid publication, and maintaining independence from academic societies and other vested interests. The journal presents two main research paper formats: Letters and Articles. Alongside primary research, Nature Physics serves as a central source for valuable information within the physics community through Review Articles, News & Views, Research Highlights covering crucial developments across the physics literature, Commentaries, Book Reviews, and Correspondence.
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