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PreprintCC BY 4.0arXiv

Singular observation of shape and spin hindrance in metastable nuclear decay of 197Au

  • S. K. Tandel
  • D. Rathore
  • M. Hemalatha
  • Subhrajit Sahoo
  • P. C. Srivastava
  • P. Chowdhury
  • R. V. F. Janssens
  • F. G. Kondev
  • M. P. Carpenter
  • T. Lauritsen
  • D. Seweryniak
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Abstract

A Iπ = (29/2+) metastable state with T1/2 $ > $ 10 s at Ex = 2102 keV has been identified in the stable nucleus, 197Au. Its decay exhibits the unusual coexistence of a strongly hindered E2 transition and a competing E4 branch with comparable intensity, indicating the simultaneous presence of shape- and spin-related hindrance mechanisms. Such a decay pattern has not previously been identified in a long-lived nuclear state and serves as a sensitive probe of the interplay between shell structure, configuration mixing, and collective degrees of freedom. This result establishes an important benchmark for modern nuclear-structure models, for which a unified description of all observables remains challenging.

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Cite

BibTeXRIS
BibTeX
@misc{tandel2026singular,
  title = {{Singular observation of shape and spin hindrance in metastable nuclear decay of $^197$Au}},
  author = {S. K. Tandel and D. Rathore and M. Hemalatha and Subhrajit Sahoo and P. C. Srivastava and P. Chowdhury and R. V. F. Janssens and F. G. Kondev and M. P. Carpenter and T. Lauritsen and D. Seweryniak},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.25915},
  eprint = {2610.25915},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.25915},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Singular observation of shape and spin hindrance in metastable nuclear decay of ^197Au
AU  - S. K. Tandel
AU  - D. Rathore
AU  - M. Hemalatha
AU  - Subhrajit Sahoo
AU  - P. C. Srivastava
AU  - P. Chowdhury
AU  - R. V. F. Janssens
AU  - F. G. Kondev
AU  - M. P. Carpenter
AU  - T. Lauritsen
AU  - D. Seweryniak
PY  - 2026
DA  - 2026/10/19
PB  - arXiv
DO  - 10.48550/arxiv.2610.25915
UR  - https://arxiv.org/abs/2610.25915
AB  - A I^π = (29/2^+) metastable state with T_1/2 $ > $ 10 s at E_x = 2102 keV has been identified in the stable nucleus, ^197Au. Its decay exhibits the unusual coexistence of a strongly hindered E2 transition and a competing E4 branch with comparable intensity, indicating the simultaneous presence of shape- and spin-related hindrance mechanisms. Such a decay pattern has not previously been identified in a long-lived nuclear state and serves as a sensitive probe of the interplay between shell structure, configuration mixing, and collective degrees of freedom. This result establishes an important benchmark for modern nuclear-structure models, for which a unified description of all observables remains challenging.
ER  -