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Lifetime measurements in W165 and the spin evolution of E2 transition strength

T. Milanović1,2,*, B. Cederwall1, M. Doncel3, I. Zanon1, H. Li1, U. Jakobsson1,4, K. Auranen5, S. Bönig6, M. C. Drummond7 et al.

T. Grahn5, P. T. Greenlees5, A. Herzáň8, D. T. Joss7, R. Julin5, S. Juutinen5, J. Konki5, T. Kröll6, M. Leino5, C. McPeake7, D. O'Donnell7, R. D. Page7, J. Pakarinen5, J. Partanen5,†, P. Peura5, P. Rahkila5, P. Ruotsalainen5, M. Sandzelius5, J. Sarén5, B. Saygi9, C. Scholey5, J. Sorri10, S. Stolze5, M. J. Taylor11, A. Thornthwaite7, and J. Uusitalo5

  • *Contact author: tmilanovic@vin.bg.ac.rs
  • †Deceased.
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Phys. Rev. C 113, 024307 – Published 5 February, 2026

DOI: https://doi.org/10.1103/2dtq-q465

Abstract

Lifetimes of low-lying states in the yrast νi13/2 band in W165 have been measured using the recoil distance Doppler-shift (RDDS) method. The excited states of interest were populated in the Mo92(Kr78,4p1n)W165 fusion-evaporation reaction and their decays were investigated via γ rays detected in the Jurogam II detector array in coincidence with nuclei separated and detected using the RITU gas-filled separator. From the experimental lifetimes, corresponding reduced transition strengths, B(E2) values, were deduced and an unusually low experimental value of the ratio B(E2;21/2+→17/2+)B(E2;17/2+→13/2+)=0.59(7) was extracted, similar to what has been observed in neighboring nuclei in this mass region. The experimental results have been compared with Woods-Saxon-type mean field and interacting boson-approximation (IBM-1) calculations.

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Phys. Rev. C 113, 024307– Published 5 February, 2026
  • Received 8 July 2025
  • Revised 26 October 2025
  • Accepted 13 November 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.

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