Magnetic rotational band at high excitation energy in 207Po

IF 2.8 3区物理与天体物理 Q2 PHYSICS, NUCLEAR

The European Physical Journal A Pub Date : 2025-09-10 DOI:10.1140/epja/s10050-025-01680-9

Md. A. Asgar, G. Mukherjee, A. Dhal, T. Roy, Soumik Bhattacharya, R. Banik, S. Bhattacharyya, C. Bhattacharya, K. Banerjee, T. K. Ghosh, S. Kundu, R. Pandey, Pratap Roy, T. K. Rana, S. Manna, A. Sen, D. Mondal, D. Pandit, S. Mukhopadhyay, S. Pal

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Abstract

The medium-high spin states in ²⁰⁷Po were investigated by the ²⁰⁸Pb(\(\alpha \), 5n)²⁰⁷Po fusion-evaporation reaction at a beam energy of 60 MeV. The \(\gamma \) rays were detected using the VENUS (VECC NUclear Spectroscopy) array, consisting of 6 Compton-Suppressed clover HPGe detectors. In this work, a new and improved level scheme of ²⁰⁷Po has been proposed that extends up to an excitation energy of \(\sim \) 6.9 MeV and a spin of (49/2) \(\hbar \). The DCO (Directional Correlation of Oriented state) and IPDCO (Integrated Polarization Directional Correlation of Oriented state) ratios were measured to assign the spins and parities of the levels. A magnetic rotational band has been identified for the first time in this nucleus with 5-qp configuration at an excitation energy of 4.8 MeV. This band has been interpreted using a semi-classical shears-band model. A possible crossing with a 7-qp MR band is also suggested.

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207Po高激发能下的磁旋转带

利用208Pb(\(\alpha \), 5n)207Po在60 MeV束流下的聚变-蒸发反应研究了207Po的中-高自旋态。利用由6个康普顿抑制三叶草HPGe探测器组成的VENUS （VECC核光谱学）阵列检测\(\gamma \)射线。在这项工作中，提出了一种新的改进的207Po能级方案，其激发能达到\(\sim \) 6.9 MeV，自旋为（49/2）\(\hbar \)。通过测量取向态方向相关系数（DCO）和取向态综合极化方向相关系数（IPDCO）来确定能级的自旋和对偶。在激发能为4.8 MeV的5-qp核中首次发现了一个磁旋转带。该带已被解释使用半经典剪切带模型。还提出了与7-qp MR波段的可能交叉。

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

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.