University of Oulu

Singh, B. S. N., Cullen, D. M., Taylor, M. J., Srivastava, P. C., Isacker, P. V., Beeke, O., . . . Venhart, M. (2018). Level structure above the 17+ isomeric state in 152 69 Tm83. Physical Review C, 98 (2), 024319. doi:10.1103/PhysRevC.98.024319

Level structure above the 17⁺ isomeric state in ¹⁵²₆₉Tm₈₃

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Author: Singh, B. S. Nara1; Cullen, D. M.1; Taylor, M. J.1,2;
Organizations: 1Schuster Building, School of Physics and Astronomy, The University of Manchester
2Division of Cancer Sciences, The University of Manchester
3Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3
4Department of Physics, Indian Institute of Technology Roorkee
5University of Jyvaskylä, Department of Physics
6School of Computing, Engineering and Physical Sciences, University of the West of Scotland
7Department of Chemistry-Radiochemistry, University of Helsinki
8Department of Nuclear Physics, iThemba Laboratory for Accelerator Based Sciences
9STUK, Radiation and Nuclear Safety Authority
10University of Oulu, Sodankylä Geophysical Observatory
11Institute of Physics, Slovak Academy of Sciences
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: American Physical Society, 2018
Publish Date: 2018-10-08


Excited states above the 17⁺ isomeric state in the proton-rich nucleus ¹⁵²Tm were established by employing the recoil-isomer tagging technique. Data were collected using the JUROGAM gamma-ray array and the GREAT spectrometer together with the recoil ion transport unit (RITU) gas-filled recoil separator and analyzed to identify the prompt and delayed γ decays from the levels in ¹⁵²Tm. Shell-model calculations, either in a large valence space or in a reduced model space with five protons in the π0h₁₁/₂ orbital and one neutron in the ν1f/₂ orbital, agree with the observed energies of the yrast levels up to angular momentum J = 21. The observation of near degeneracies in the energy spectrum can be attributed to specific components of the proton-neutron interaction. The isomeric decay of the 17⁺ level is not reproduced in the shell-model calculations as it arises from a delicate balance between hindrance due to seniority selection rules and enhancement due to configuration mixing.

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Series: Physical review. C
ISSN: 2469-9985
ISSN-E: 2469-9993
ISSN-L: 2469-9985
Volume: 98
Issue: 2
DOI: 10.1103/PhysRevC.98.024319
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This work was supported by the EU 7th Framework Programme, Integrating Activities Transnational Access, Project No. 262010 ENSAR, and by the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL). The authors acknowledge GAMMAPOOL support for the JUROGAM detectors and B.S.N.S., D.M.C., M.J.T., S. K., and D.D. acknowledge the support of the Science and Technology Facilities Council, Grant No. ST/L005794/1. M.V. acknowledges the support of the Slovak Research and Development Agency under Contract No. APVV-15-0225 and the Slovak Grant Agency VEGA (Contract No. 2/0129/17). The theoretical work was supported by the Sandwich PhD scholarship programme 2008-09 from Embassy of France in India.
Copyright information: © 2018 American Physical Society. Published in this repository with the kind permission of the publisher.