High-spin structure of the sd shell nuclei Na25 and Ne22

J. Williams, G. C. Ball, A. Chester, P. Choudhary, T. Domingo, A. B. Garnsworthy, G. Hackman, J. Henderson, R. Henderson, R. Krücken, R. S. Lubna, J. Measures, O. Paetkau, J. Park, J. Smallcombe, P. C. Srivastava, K. Starosta, C. E. Svensson, K. Whitmore, and M. Williams
Phys. Rev. C 102, 064302 – Published 1 December 2020

Abstract

The level structure of Na25 and Ne22 in the high excitation energy/high spin regime was studied using γ-ray spectroscopy and Doppler shift lifetime measurements following C12(O18,αp)Na25 and C12(O18,2α)Ne22 reactions. Multiple new levels and transitions were identified in both nuclides based on γγ coincidence data. In Na25, evidence was found for higher-spin negative-parity states up to Iπ=13/2 resulting from neutron excitation into the pf shell, in good agreement with shell model calculations using the SDPF-MU and FSU interactions. Candidates for the yrast 7+ and 8+ levels in Ne22, consistent with calculations using the USDB interaction, were also identified.

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  • Received 4 August 2020
  • Accepted 17 November 2020

DOI:https://doi.org/10.1103/PhysRevC.102.064302

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

J. Williams1,*, G. C. Ball1, A. Chester2,†, P. Choudhary3, T. Domingo2, A. B. Garnsworthy1, G. Hackman1, J. Henderson1,‡, R. Henderson1, R. Krücken1,4, R. S. Lubna1, J. Measures1,5, O. Paetkau1, J. Park1,4,§, J. Smallcombe1,∥, P. C. Srivastava3, K. Starosta2, C. E. Svensson6, K. Whitmore2, and M. Williams1

  • 1TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
  • 2Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
  • 3Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
  • 4Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
  • 5Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
  • 6Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1

  • *ewilliams@triumf.ca
  • Present address: National Superconducting Cyclotron Laboratory, 640 South Shaw Lane, East Lansing, MI 48824, USA.
  • Present address: Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA 94550, USA.
  • §Present address: Center for Exotic Nuclear Studies, Institute for Basic Science, 34126 Daejeon, Republic of Korea.
  • Present address: Department of Physics, University of Liverpool, Liverpool L69 3BX, UK.

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Vol. 102, Iss. 6 — December 2020

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