Physics Letters B (Sep 2017)

Enhanced collectivity along the N=Z line: Lifetime measurements in 44Ti, 48Cr, and 52Fe

  • K. Arnswald,
  • T. Braunroth,
  • M. Seidlitz,
  • L. Coraggio,
  • P. Reiter,
  • B. Birkenbach,
  • A. Blazhev,
  • A. Dewald,
  • C. Fransen,
  • B. Fu,
  • A. Gargano,
  • H. Hess,
  • R. Hirsch,
  • N. Itaco,
  • S.M. Lenzi,
  • L. Lewandowski,
  • J. Litzinger,
  • C. Müller-Gatermann,
  • M. Queiser,
  • D. Rosiak,
  • D. Schneiders,
  • B. Siebeck,
  • T. Steinbach,
  • A. Vogt,
  • K. Wolf,
  • K.O. Zell

DOI
https://doi.org/10.1016/j.physletb.2017.07.032
Journal volume & issue
Vol. 772, no. C
pp. 599 – 606

Abstract

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Lifetimes of the 21+ states in 44Ti, 48,50Cr, and 52Fe were determined with high accuracy exploiting the recoil distance Doppler-shift method. The reduced E2 transition strengths of 44Ti and 52Fe differ considerably from previously known values. A systematic increase in collectivity is found for the N=Z nuclei compared to neighboring isotopes. The B(E2) values along the Ti, Cr, and Fe isotopic chains are compared to shell-model calculations employing established interactions for the 0f1p shell, as well as a novel effective shell-model Hamiltonian starting from a realistic nucleon–nucleon potential. The theoretical approaches underestimate the B(E2) values for the lower-mass Ti isotopes. Strong indication is found for particle-hole cross-shell configurations, recently corroborated by similar results for the neighboring isotone 42Ca.

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