Investigating the collectivity of intruder states along N=49 isotones

IF 1.7 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A Pub Date : 2025-04-23 DOI:10.1016/j.nuclphysa.2025.123125

J. Pellumaj , A. Gottardo , A. Goasduff , D. Bazzacco , D. Brugnara , G. Benzoni , S. Bottoni , S. Capra , G. de Angelis , A. Gozzelino , J. Ha , S.M. Lenzi , T. Marchi , R. Menegazzo , D. Mengoni , A. Nannini , D.R. Napoli , R.M. Pérez-Vidal , S. Pigliapoco , F. Recchia , M. Loriggiola

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引用次数: 0

Abstract

Intruder states that originate from the promotion of neutrons across the N=50 shell gap are observed along the N=49 isotones (⁷⁹Zn, ⁸¹Ge, ⁸³Se, ⁸⁵Kr), with the lowest energy in ⁸³Se. The reduction of the N=50 shell gap towards Ni favors the lowering in the energy of these states. Moreover, since the Se nucleus (Z=34) is in the middle of the proton fp-shell (28≤Z≤40), it should have the maximum quadrupole correlations, lowering further the energy of these deformed configurations. This makes Se a good candidate for understanding the collectivity of the particle-hole intruder states in this region. Such information could also be used as a testing ground for theoretical models aiming to describe the region in the vicinity of ⁷⁸Ni. An experiment aiming to measure the lifetime of the 540-keV 1/2⁺ and 1100-keV 3/2⁺ intruder states of ⁸³Se was performed at LNL and is reported in this work.

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研究沿N=49等音的入侵态的集体

在N=49等音层（79Zn, 81Ge, 83Se, 85Kr）上，可以观察到源自中子穿过N=50壳隙的侵入态，其中83Se的能量最低。N=50壳层间隙向Ni方向的减小有利于这些态能量的降低。此外，由于Se核（Z=34）位于质子fp-壳层（28≤Z≤40）的中间，它应该具有最大的四极相关，从而进一步降低了这些变形构型的能量。这使得Se成为理解该区域粒子-空穴侵入态集体性的一个很好的候选者。这些信息也可以作为旨在描述78Ni附近区域的理论模型的试验场。本文报道了在LNL上测量83Se的540-keV 1/2+和1100-keV 3/2+侵入态寿命的实验。

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

Nuclear Physics A 物理-物理：核物理

CiteScore

3.60

自引率

7.10%

发文量

113

审稿时长

61 days

期刊介绍： Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.