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Decay spectroscopy of Os 171,172 and Ir 171,172,174

Zhang, W. ; Cederwall, B. ; Doncel, M. ; Aktas ; Ertoprak, A. ; Qi, C. ; Grahn, T. ; Nara Singh, B. S. ; Cullen, D. M. and Hodge, D. , et al. (2023) In Physical Review C 107(1).
Abstract

We report on a study of the α-decay fine structure and the associated Eα-Eγ correlations in the decays of Os171,172 and Ir171,172,174. In total, 13 new α-decay energy lines have been resolved, and three new γ-ray transitions have been observed following the new decay branches to Re168 and W167. The weak α-decay branch from the bandhead of the νi13/2 band in Os171 observed in this work highlights an unusual competition between α, β, and electromagnetic decays from this isomeric state. The nucleus Os171 is therefore one of few nuclei observed to exhibit three different decay modes from the same excited state. The nuclei of interest were produced in Mo92(Kr83,xpyn) fusion-evaporation reactions at the Accelerator Laboratory of the... (More)

We report on a study of the α-decay fine structure and the associated Eα-Eγ correlations in the decays of Os171,172 and Ir171,172,174. In total, 13 new α-decay energy lines have been resolved, and three new γ-ray transitions have been observed following the new decay branches to Re168 and W167. The weak α-decay branch from the bandhead of the νi13/2 band in Os171 observed in this work highlights an unusual competition between α, β, and electromagnetic decays from this isomeric state. The nucleus Os171 is therefore one of few nuclei observed to exhibit three different decay modes from the same excited state. The nuclei of interest were produced in Mo92(Kr83,xpyn) fusion-evaporation reactions at the Accelerator Laboratory of the University of Jyväskylä, Finland. The fusion products were selected using the gas-filled ion separator RITU and their decays were characterized using an array of detectors for charged particles and electromagnetic radiation known as GREAT. Prompt γ-ray transitions were detected and correlated with the decays using the JUROGAM II germanium detector array surrounding the target position. Results obtained from total Routhian surface (TRS) calculations suggest that α-decay fine structure and the associated hindrance factors may be a sensitive probe of even relatively small shape changes between the final states in the daughter nucleus.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
107
issue
1
article number
014308
publisher
American Physical Society
external identifiers
  • scopus:85147591909
ISSN
2469-9985
DOI
10.1103/PhysRevC.107.014308
language
English
LU publication?
yes
id
746c1be4-7a02-423d-b9ce-bfe77edc6783
date added to LUP
2023-02-21 11:49:47
date last changed
2023-02-21 11:49:47
@article{746c1be4-7a02-423d-b9ce-bfe77edc6783,
  abstract     = {{<p>We report on a study of the α-decay fine structure and the associated Eα-Eγ correlations in the decays of Os171,172 and Ir171,172,174. In total, 13 new α-decay energy lines have been resolved, and three new γ-ray transitions have been observed following the new decay branches to Re168 and W167. The weak α-decay branch from the bandhead of the νi13/2 band in Os171 observed in this work highlights an unusual competition between α, β, and electromagnetic decays from this isomeric state. The nucleus Os171 is therefore one of few nuclei observed to exhibit three different decay modes from the same excited state. The nuclei of interest were produced in Mo92(Kr83,xpyn) fusion-evaporation reactions at the Accelerator Laboratory of the University of Jyväskylä, Finland. The fusion products were selected using the gas-filled ion separator RITU and their decays were characterized using an array of detectors for charged particles and electromagnetic radiation known as GREAT. Prompt γ-ray transitions were detected and correlated with the decays using the JUROGAM II germanium detector array surrounding the target position. Results obtained from total Routhian surface (TRS) calculations suggest that α-decay fine structure and the associated hindrance factors may be a sensitive probe of even relatively small shape changes between the final states in the daughter nucleus.</p>}},
  author       = {{Zhang, W. and Cederwall, B. and Doncel, M. and Aktas and Ertoprak, A. and Qi, C. and Grahn, T. and Nara Singh, B. S. and Cullen, D. M. and Hodge, D. and Giles, M. and Stolze, S. and Auranen, K. and Badran, H. and Braunroth, T. and Calverley, T. and Cox, D. M. and Fang, Y. D. and Greenlees, P. T. and Hilton, J. and Ideguchi, E. and Julin, R. and Juutinen, S. and Kumar Raju, M. and Leino, M. and Li, H. and Liu, H. and Matta, S. and Subramaniam, P. and Modamio, V. and Pakarinen, J. and Papadakis, P. and Partanen, J. and Petrache, C. M. and Rahkila, P. and Ruotsalainen, P. and Sandzelius, M. and Sarén, J. and Scholey, C. and Sorri, J. and Taylor, M. J. and Uusitalo, J. and Valiente-Dobón, J. J.}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Decay spectroscopy of Os 171,172 and Ir 171,172,174}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.107.014308}},
  doi          = {{10.1103/PhysRevC.107.014308}},
  volume       = {{107}},
  year         = {{2023}},
}