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

• Published in: Physics letters. B Vol. 772; no. C; pp. 599 - 606
• Main Authors: Arnswald, K., Braunroth, T., Seidlitz, M., Coraggio, L., Reiter, P., Birkenbach, B., Blazhev, A., Dewald, A., Fransen, C., Fu, B., Gargano, A., Hess, H., Hirsch, R., Itaco, N., Lenzi, S.M., Lewandowski, L., Litzinger, J., Müller-Gatermann, C., Queiser, M., Rosiak, D., Schneiders, D., Siebeck, B., Steinbach, T., Vogt, A., Wolf, K., Zell, K.O.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 10-09-2017; Elsevier
• Subjects: [formula omitted] nuclei; B(E2) values; Lifetime measurements; N=Z nuclei; RDDS; B(E2) values; Lifetime measurements; N=Z nuclei; RDDS
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2017.07.032

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.