The 76Cu conundrum remains unsolved

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B Pub Date : 2025-05-09 DOI:10.1016/j.physletb.2025.139551

B. Olaizola , A. Illana , J. Benito , D.P. Suárez-Bustamante , G. Del Piccolo , A. Algora , B. Andel , A.N. Andreyev , M. Araszkiewicz , Y. Ayyad , R.A. Bark , T. Berry , M.J.G. Borge , K. Chrysalidis , T.E. Cocolios , C. Costache , J.G. Cubiss , P. Van Duppen , Z. Favier , L.M. Fraile , Z. Yue

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引用次数: 0

Abstract

Near the doubly-magic nucleus ⁷⁸Ni (

Z = 28

N = 50

), there has been a decades-long debate on the existence of a long-lived isomer in ⁷⁶Cu. A recent mass measurement claimed to have settled the debate, by measuring the energy of the isomer and shedding light on the structure of the nucleus. In this work, we present new, more accurate, and precise values of the half-lives of the isomeric and ground states in ⁷⁶Cu. Our findings suggest that both states have very similar half-lives, in the 600–700 ms range, in disagreement with the literature values, implying that they cannot be differentiated by their decay curves. These results raise more questions than they answer, reopening the debate and showing that the structures in ⁷⁶Cu are still not fully understood.

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76铜的谜题仍未解决

在双幻核78Ni （Z=28， N=50）附近，关于76Cu中是否存在长寿命异构体的争论已经持续了几十年。最近的一项质量测量声称，通过测量同分异构体的能量并揭示原子核的结构，解决了这场争论。在这项工作中，我们提出了新的、更精确的76Cu同分异构体和基态半衰期值。我们的发现表明，这两种状态的半衰期非常相似，在600-700 ms范围内，这与文献值不一致，这意味着它们不能通过它们的衰变曲线来区分。这些结果提出的问题比它们回答的问题要多，重新引发了争论，并表明76Cu的结构仍然没有被完全理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physics Letters B 物理-物理：综合

CiteScore

9.10

自引率

6.80%

发文量

647

审稿时长

3 months

期刊介绍： Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.