Spectroscopy of 187Tl: shape coexistence

IF 2.6 3区物理与天体物理 Q2 PHYSICS, NUCLEAR The European Physical Journal A Pub Date : 2024-08-24 DOI:10.1140/epja/s10050-024-01395-3

C. Y. Guo, W. Q. Zhang, H. Huang, S. Q. Zhang, Z. H. Li, Z. Liu, H. Hua, D. W. Luo, H. Y. Wu, A. N. Andreyev, D. Seweryniak, B. Andel, S. Antalic, A. E. Barzakh, M. Block, A. Bronis, M. P. Carpenter, P. Copp, J. G. Cubiss, D. T. Doherty, P. Van Duppen, Z. Favier, F. Giacoppo, B. Kindler, F. G. Kondev, T. Lauritsen, X. Q. Li, B. Lommel, M. Al Monthery, P. Mošať, L. Ni, C. Raison, W. Reviol, G. Savard, S. Stolze, G. L. Wilson, C. Xu, J. Z. Zhang, S. Y. Zhang, Z. X. Zhou

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Abstract

The prompt and delayed \(\gamma \)-ray spectra of ¹⁸⁷Tl was studied via the ¹⁴²Nd(⁵⁰Cr, 3p2n)¹⁸⁷Tl fusion-evaporation reaction at a beam energy of 255 MeV. An enhanced level scheme of ¹⁸⁷Tl was established. The collective bands with one-quasiparticle configurations from the \(2f_{7/2}\), \(1h_{9/2}\), \(1h_{11/2}\) and \(1i_{13/2}\) orbitals and high-lying structures with possible three-quasiparticle configurations are investigated in terms of the tilted axis cranking covariant density functional theory. At low excitation energy, the rotational bands with one-quasiparticle configurations reflect coexistence of three shapes: prolate, triaxial, and oblate. The possible shapes of two microsecond isomers at high excitation energy are proposed.

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187Tl 的光谱学：形状共存

在255MeV的束流能量下，通过142Nd(50Cr, 3p2n)187Tl聚变-蒸发反应研究了187Tl的瞬时和延迟（伽马）-射线光谱。建立了 187Tl 的增强水平方案。用倾斜轴曲柄协变密度泛函理论研究了来自\(2f_{7/2}\)、\(1h_{9/2}\)、\(1h_{11/2}\)和\(1i_{13/2}\)轨道的具有一准粒子构型的集合带以及可能具有三准粒子构型的高边沿结构。在低激发能量下，具有单准粒子构型的旋转带反映了三种形状的共存：长圆形、三轴形和扁圆形。提出了高激发能量下两种微秒异构体的可能形状。

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来源期刊

The European Physical Journal A 物理-物理：核物理

CiteScore

5.00

自引率

18.50%

发文量

216

审稿时长

3-8 weeks

期刊介绍： Hadron Physics Hadron Structure Hadron Spectroscopy Hadronic and Electroweak Interactions of Hadrons Nonperturbative Approaches to QCD Phenomenological Approaches to Hadron Physics Nuclear and Quark Matter Heavy-Ion Collisions Phase Diagram of the Strong Interaction Hard Probes Quark-Gluon Plasma and Hadronic Matter Relativistic Transport and Hydrodynamics Compact Stars Nuclear Physics Nuclear Structure and Reactions Few-Body Systems Radioactive Beams Electroweak Interactions Nuclear Astrophysics Article Categories Letters (Open Access) Regular Articles New Tools and Techniques Reviews.