Re-examination of nuclear structure properties and shape co-existence of nuclei around A ∼ 70

IF 1.7 4区 物理与天体物理 Q2 PHYSICS, NUCLEAR
Jameel-Un Nabi , Tuncay Bayram , Mahmut Böyükata , Asim Ullah , Anes Hayder , Syeda Zainab Naqvi
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引用次数: 0

Abstract

We re-examine the nuclear structure properties of waiting point nuclei around A ∼ 70 using the interacting boson model-1 (IBM-1) and the relativistic mean field (RMF) model. Effective density-dependent meson-exchange functional (DD-ME2) and density-dependent point-coupling functional (DD-PC1) were used for the RMF calculations. We calculated the energy levels, the geometric shapes, binding and separation energies of nucleons and quadrupole deformation parameters (β2). The shape co-existence phenomena in A ∼ 70 nuclei (68Se, 70Se, 70Br, 70Kr, 72Kr, 74Kr, 74Rb and 74Sr) was later investigated. Spherical and deformed shapes of the selected waiting point nuclei were computed using the IBM-1 and RMF models, respectively. The proton-neutron quasiparticle random phase approximation (pn-QRPA) model was used to calculate β-decay properties (Gamow-Teller strength distributions, β-decay half-lives and branching ratios) of selected nuclei as a function of β2. The results revealed a significant variation in calculated half-lives and Gamow-Teller strength distributions as the shape parameter was changed. The β2 computed via DD-ME2 functional resulted in half-lives in best agreement with the measured data.

重新研究 A ∼ 70 附近原子核的核结构特性和形状共存性
我们利用相互作用玻色子模型-1(IBM-1)和相对论平均场模型(RMF)重新检验了A∼70附近等待点核的核结构性质。RMF计算使用了有效密度介子交换函数(DD-ME2)和密度点耦合函数(DD-PC1)。我们计算了核子的能级、几何形状、结合能和分离能以及四极变形参数(β2)。随后研究了 A ∼ 70 核(68Se、70Se、70Br、70Kr、72Kr、74Kr、74Rb 和 74Sr)的形状共存现象。利用 IBM-1 和 RMF 模型分别计算了所选等待点核的球形和变形形状。质子-中子准粒子随机相近似(pn-QRPA)模型用于计算选定原子核的β衰变特性(伽莫-泰勒强度分布、β衰变半衰期和支化比)与β2的函数关系。结果表明,随着形状参数的变化,计算出的半衰期和伽莫-泰勒强度分布也会发生显著变化。通过 DD-ME2 函数计算出的β2 使半衰期与测量数据最为吻合。
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来源期刊
Nuclear Physics A
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.
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