Microscopic investigation of the I^π=8^- isomer decay in even-even N = 74 isotones

Abstract

The microscopic approach of the triaxial projected shell model (TPSM) is employed to investigate the properties of the 8^- isomer in the six isotones of ¹²⁸Xe, ¹³⁰Ba, ¹³²Ce, ¹³⁴Nd, ¹³⁶Sm, and ¹³⁸Gd. The observed decay pattern of the isomer for these isotones is unexpected with the hindrance factor decreasing with atomic number. It is shown in the present work that multi-quasiparticle mixing into the ground-state configuration is responsible for the observed decreasing trend of the hindrance factor. We have also calculated the excitation energies and in-band B(E2) transition probabilities of the yrast and the band built on the 8^- isomer for the six isotones, and it is shown that TPSM approach reproduces the measured quantities quite satisfactorily.

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BibTeX RIS

BibTeX

@misc{bhat2026microscopic,
  title = {{Microscopic investigation of the $I^π=8^-$ isomer decay in even-even N = 74 isotones}},
  author = {S. A. Bhat and Nazira Nazir and W. Tawseef and J. A. Sheikh and G. H. Bhat and S. Jehangir and G. B. Vakil and M. Bhuyan},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.23622},
  eprint = {2609.23622},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.23622},
}

RIS

TY  - UNPB
TI  - Microscopic investigation of the I^π=8^- isomer decay in even-even N = 74 isotones
AU  - S. A. Bhat
AU  - Nazira Nazir
AU  - W. Tawseef
AU  - J. A. Sheikh
AU  - G. H. Bhat
AU  - S. Jehangir
AU  - G. B. Vakil
AU  - M. Bhuyan
PY  - 2026
DA  - 2026/09/20
PB  - arXiv
DO  - 10.48550/arxiv.2609.23622
UR  - https://arxiv.org/abs/2609.23622
AB  - The microscopic approach of the triaxial projected shell model (TPSM) is employed to investigate the properties of the 8^- isomer in the six isotones of ^128Xe, ^130Ba, ^132Ce, ^134Nd, ^136Sm, and ^138Gd. The observed decay pattern of the isomer for these isotones is unexpected with the hindrance factor decreasing with atomic number. It is shown in the present work that multi-quasiparticle mixing into the ground-state configuration is responsible for the observed decreasing trend of the hindrance factor. We have also calculated the excitation energies and in-band B(E2) transition probabilities of the yrast and the band built on the 8^- isomer for the six isotones, and it is shown that TPSM approach reproduces the measured quantities quite satisfactorily.
ER  -

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