Discovery of an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msup> <mml:mrow> <mml:mi>I</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> </mml:msup> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> <mm
Delayed γ-ray spectroscopy was performed for evaporation residues produced in the ^{58}Ni+^{96}Ru reaction. A new isomer in _{ 70}^{150}Yb (Z=70, N=80) with a half-life of 0.62(5) μs was identified at an excitation energy of 2872(2) keV. Its spin-parity is assigned as (10^{+}) and a decay scheme is proposed based on a strong analogy with that of the isotonic _{ 68}^{148}Er. Previously, the 10^{+} isomers were observed in the N=80 even-Z isotones from the neutron-rich _{ 46}^{126}Pd to the neutron-deficient _{ 68}^{148}Er. For the first time, by combining experimental data and comprehensive large-scale shell-model calculations, we clearly identify the configurations of these isomers and demonstrate that they all exhibit seniority structures. These findings firmly establish a configuration change in the 10^{+} isomeric chain, from a pair of maximally aligned 1h_{11/2} neutrons (holes) to a pair of maximally aligned 1h_{11/2} protons around the Z=64 subshell closure. This transition serves as a unique isomeric relay underpinning the persistence of the isomeric chain.
Authors
- S. Piétri (ORCID: https://orcid.org/0000-0003-0338-1067)
- Spencer J. Williams (ORCID: https://orcid.org/0000-0001-6341-4364)
- Т. Уесака (ORCID: https://orcid.org/0000-0002-0068-4719)
- M. Nyman (ORCID: https://orcid.org/0000-0002-9661-6461)
- P. Rahkila (ORCID: https://orcid.org/0000-0003-4392-0782)
- M. Leino
- Chong Qi (ORCID: https://orcid.org/0000-0002-1406-5695)
- S. Eeckhaudt
- Juha Uusitalo (ORCID: https://orcid.org/0000-0001-7393-6465)
- R. Julin (ORCID: https://orcid.org/0000-0002-1214-8366)
- J. Sarén
- T. Grahn (ORCID: https://orcid.org/0000-0002-6255-2279)
- S. Ketelhut (ORCID: https://orcid.org/0000-0003-2099-3452)
- Z S Podolyák
- Anonymous
- S. F. Ashley
- B. H. Sun
- A. N. Andreyev
- M. Niikura
- P. Jones
- P. T. Greenlees
- N. J. Thompson
- S. Y. Zhang
- X. X. Xu
- R. D. Page
- Y. F. Wu
- A. B. Garnsworthy
- Z. Liu
- M. L. Liu
- C. Ma
- P. M. Walker
- H. Huang (ORCID: https://orcid.org/0009-0001-5958-7577)
- G. J. Fu
- X. H. Yu
- F. S. Zhang
- D. T. Joss
- Y. X. Yu
- Q. B. Zeng
- D. G. Jenkins
- M. B. Gómez-Hornillos
- I. G. Darby
- J. Pakarinen
- X. H. Zhou
- Z. H. Li
- J. G. Li
- C. X. Yuan
Institutions
- Tongji University (CN)
- University of Helsinki (FI)
- University of Liverpool (GB)
- Sun Yat-sen University (CN)
- GSI Helmholtz Centre for Heavy Ion Research (DE)
- Shanghai Jiao Tong University (CN)
- Peking University (CN)
- Beijing Normal University (CN)
- Khyber Teaching Hospital (PK)
- Daresbury Laboratory (GB)
- University of Surrey (GB)
- iThemba Laboratory (ZA)
- Sellafield (United Kingdom) (GB)
- Institute of Modern Physics (CN)
- RIKEN Nishina Center (JP)
- University of Chinese Academy of Sciences (CN)
- University of York (GB)
- The University of Tokyo (JP)
- Beihang University (CN)
- University of Jyväskylä (FI)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2026-01-28
- DOI
- https://doi.org/10.1103/6cjc-bhfg
- Primary Topic
- Quantum Chromodynamics and Particle Interactions
- Type
- article
- Field-Weighted Citation Impact
- 0.00