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

• DOI: 10.1016/j.physletb.2017.07.032
• Publication Date: 2017-07-20T13:30:18Z
• Authors: 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
• Keywords: Recoil; Hamiltonian (control theory); Nuclear shell model

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