Search for Weak Side Branches in the Electromagnetic Decay Paths of the 6526-keV 10+ Isomer in 54Fe

IF 1.7 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Atoms Pub Date : 2023-08-24 DOI:10.3390/atoms11090116

P. Böhm, Y. Hrabar, D. Rudolph, P. Golubev, L. Sarmiento, Helena M. Albers, John T. Anderson, M. Bentley, M. Carpenter, C. Chiara, P. Copp, U. Forsberg, Tianheng Huang, H. Jayatissa, T. Lauritsen, C. Müller-Gatermann, X. Pereira-Lopez, W. Reviol, D. Seweryniak, S. Stolze, S. Uthayakumaar, G. Wilson, Jin Wu

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Abstract

High-spin nuclear isomers in N≈Z nuclei between doubly magic 40Ca and 56Ni provide an excellent testing ground for the nuclear shell model and questions related to isospin symmetry breaking in the vicinity of the proton drip line. The purpose of the present study is to investigate the possibility of weak electromagnetic decay branches along the decay paths of the 6526-keV 10+ isomer in 54Fe. The isomer was strongly populated by means of the fusion-evaporation reaction 24Mg(36Ar,α2p)54mFe. The Gammasphere array was used to detect γ-ray cascades emitted from the isomeric state. By means of γγγ coincidences, weak non-yrast decay branches can be discriminated, with the isomer’s half-life confirmed at T1/2=363(4) ns. The yrast 61+→21+ E4 cross-over transition was interrogated. The observations are compared with shell-model calculations.

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54Fe中6526-keV 10+异构体电磁衰减路径的弱侧分支搜索

在双魔40Ca和56Ni之间的N≈Z核中的高自旋核异构体为核壳模型和质子滴线附近同位旋对称断裂的相关问题提供了一个极好的试验场。本研究的目的是研究在54Fe中6526keV 10+异构体的衰变路径上存在弱电磁衰变分支的可能性。该异构体通过熔融蒸发反应24Mg（36Ar，α2p）54mFe被强烈填充。伽马层阵列用于探测从同分异构态发射的γ射线级联。通过γ-γ-γ重合，可以区分弱的非yrast衰变分支，异构体的半衰期在T1/2=363（4）ns时得到证实。yrast 61+→询问21+E4交叉过渡。将观测结果与壳体模型计算结果进行了比较。

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来源期刊

Atoms Physics and Astronomy-Nuclear and High Energy Physics

CiteScore

2.70

自引率

22.20%

发文量

128

审稿时长

8 weeks

期刊介绍： Atoms (ISSN 2218-2004) is an international and cross-disciplinary scholarly journal of scientific studies related to all aspects of the atom. It publishes reviews, regular research papers, and communications; there is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles. There are, in addition, unique features of this journal: -manuscripts regarding research proposals and research ideas will be particularly welcomed. -computed data, program listings, and files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Scopes: -experimental and theoretical atomic, molecular, and nuclear physics, chemical physics -the study of atoms, molecules, nuclei and their interactions and constituents (protons, neutrons, and electrons) -quantum theory, applications and foundations -microparticles, clusters -exotic systems (muons, quarks, anti-matter) -atomic, molecular, and nuclear spectroscopy and collisions -nuclear energy (fusion and fission), radioactive decay -nuclear magnetic resonance (NMR) and electron spin resonance (ESR), hyperfine interactions -orbitals, valence and bonding behavior -atomic and molecular properties (energy levels, radiative properties, magnetic moments, collisional data) and photon interactions