Signatures for shape coexistence and shape/phase transitions in even-even nuclei

IF 3.4 3区物理与天体物理 Q2 PHYSICS, NUCLEAR

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2023-05-19 DOI:10.1088/1361-6471/acd70b

D. Bonatsos, A. Martinou, Spyridon K. Peroulis, T. Mertzimekis, N. Minkov

引用次数: 1

Abstract

Systematics of B(E2) transition rates connecting the first excited $0_2^+$ state to the first excited $2_1^+$ state of the ground state band in even-even nuclei indicates that shape coexistence of the ground state band and the first excited $K=0$ band should be expected in nuclei lying within the stripes of nucleon numbers 7-8, 17-20, 34-40, 59-70, 96-112 predicted by the dual shell mechanism of the proxy-SU(3) model, avoiding their junctions, within which high deformation is expected. Systematics of the excitation energies of the $0_2^+$ states in even-even nuclei show that shape coexistence due to proton-induced neutron particle-hole excitations is related to a first order shape/phase transition from spherical to deformed shapes, while shape coexistence due to neutron-induced proton particle-hole excitations is observed along major proton shell closures.

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偶偶核中形状共存和形状/相转变的特征

偶偶核中基态带第一个激发态$0_2^+$与第一个激发态$2_1^+$之间的B(E2)跃迁速率系统表明，在由代理- su(3)模型的双壳层机制预测的核子数为7-8、17-20、34-40、59-70、96-112的条纹内，基态带和第一个激发态$K=0$带的形状共存，避免了它们的结，在结内会产生高变形。偶偶核中$0_2^+$态激发能的系统分析表明，由质子诱导的中子粒子-空穴激发引起的形状共存与从球形到变形形状的一阶形状/相转变有关，而由中子诱导的质子粒子-空穴激发引起的形状共存则沿着主要的质子壳包层观察到。

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

Journal of Physics G: Nuclear and Particle Physics 物理-物理：核物理

CiteScore

7.60

自引率

5.70%

发文量

105

审稿时长

1 months

期刊介绍： Journal of Physics G: Nuclear and Particle Physics (JPhysG) publishes articles on theoretical and experimental topics in all areas of nuclear and particle physics, including nuclear and particle astrophysics. The journal welcomes submissions from any interface area between these fields. All aspects of fundamental nuclear physics research, including: nuclear forces and few-body systems; nuclear structure and nuclear reactions; rare decays and fundamental symmetries; hadronic physics, lattice QCD; heavy-ion physics; hot and dense matter, QCD phase diagram. All aspects of elementary particle physics research, including: high-energy particle physics; neutrino physics; phenomenology and theory; beyond standard model physics; electroweak interactions; fundamental symmetries. All aspects of nuclear and particle astrophysics including: nuclear physics of stars and stellar explosions; nucleosynthesis; nuclear equation of state; astrophysical neutrino physics; cosmic rays; dark matter. JPhysG publishes a variety of article types for the community. As well as high-quality research papers, this includes our prestigious topical review series, focus issues, and the rapid publication of letters.