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Isomeric states in W165 and W169

H. Joukainen1,*,†, J. Sarén1,‡, J. Uusitalo1,2,§, A. D. Briscoe2, D. T. Joss2, R. D. Page2, C. M. Sullivan2, A. McCarter2,∥, E. S. Paul2 et al.

P.-A. Aden1, A. Astier3, K. Auranen1, V. Bogdanoff1, J. Chadderton2, T. Grahn1, P. T. Greenlees1, A. Illana1,¶, P. M. Jodidar3, R. Julin1, H. Jutila1, H. Kokkonen1, M. Leino1, J. Louko1, M. Luoma1, J. Ojala1, J. Pakarinen1, C. M. Petrache3,4, A. M. Plaza1,2, P. Rahkila1, P. Ruotsalainen1, A. Tolosa-Delgado1,**, E. Uusikylä1, and G. L. Zimba1,††

  • *Contact author: henna.joukainen@chalmers.se
  • †Present address: Department of Physics and Astronomy, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
  • ‡Contact author: jan.saren@jyu.fi
  • §Contact author: juha.uusitalo@jyu.fi
  • ∥Present address: Van Sweinderen Institute for Particle Physics and Gravity, University of Groningen, Groningen 9747AA, The Netherlands.
  • Present address: Grupo de Física Nuclear & CEI Moncloa, IPARCOS, Universidad Complutense de Madrid, E-28040 Madrid, Spain.
  • **Present address: European Organisation for Nuclear Research (CERN), Geneva, Switzerland.
  • ††Present address: Department of Physics and Astronomy, Louisiana State University, Louisiana 70803, USA.
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Phys. Rev. C 114, 024320 – Published 12 August, 2026

DOI: https://doi.org/10.1103/mxx4-sxv2

Abstract

Properties of isomeric states and the deexcitation paths to the ground state have been observed in W165 and W169 nuclei in experiments employing fusion-evaporation reactions at the Accelerator Laboratory of the University of Jyväskylä, Finland. The (13/2+) isomeric state in W165 was measured to have a half-life of 7.4(2)µs and an excitation energy of 301.4(3) keV, while in W169, the Jπ=(9/2+) isomeric state at 127.2(3) keV has t1/2=7.4(5)µs. The observed hindrance factors are 6.9(2) for the M2 deexciting transition in W165 and 2.29(15)×106 for the E1 deexciting transition in W169, of which the former is a typical value in this region, while the latter is an order of magnitude larger than most other similar cases. The excited- and ground-state spin assignments are discussed.

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Phys. Rev. C 114, 024320– Published 12 August, 2026
  • Received 12 March 2026
  • Accepted 26 June 2026
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