Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Structure and Dynamics of Nuclei IX

HK 48.8: Vortrag

Donnerstag, 1. März 2018, 15:45–16:00, HZO 70

Cross-shell excitations from the fp shell: Lifetime measurements in ⁶¹Zn — M. Queiser¹, A. Vogt¹, •M. Seidlitz¹, P. Reiter¹, T. Togashi², N. Shimizu², Y. Utsuno³, T. Otsuka², M. Honma⁴, P. Petkov⁵, K. Arnswald¹, A. Blazhev¹, T. Braunroth¹, A. Dewald¹, J. Eberth¹, C. Fransen¹, R. Hetzenegger¹, R. Hirsch¹, J. Jolie¹, V. Karayonchev¹, L. Kaya¹, L. Lewandowski¹, C. Müller-Gatermann¹, J.M. Régis¹, D. Rosiak¹, K. Wolf¹, and K.O. Zell¹ — ¹Institut für Kernphysik, Universität zu Köln — ²University of Tokyo, Japan — ³JAEA Tokai, Japan — ⁴University of Aizu, Fukushima, Japan — ⁵IFIN-HH, Bucharest, Romania

Lifetimes of excited states in the neutron-deficient nucleus ⁶¹Zn were measured employing the Recoil-Distance Doppler-Shift (RDDS) and the Fast-Timing Method in fusion-evaporation reactions at the University of Cologne. Five lifetimes were measured for the first time, including the 5/2⁻ → 3/2⁻ transition depopulating the 124-keV isomer. Short lifetimes from the RDDS analysis were corrected for Doppler-Shift Attentuation (DSA) effects in the stopper foil. Ambiguous results from previous measurements were resolved. The obtained lifetimes are compared to predictions from different sets of shell-model calculations in the fp, f_5/2pg_9/2, and multishell fp-g_9/2d_5/2 model spaces. The inclusion of cross-shell excitation into the 1d_5/2 orbital is found to be decisive for the description of collectivity in the first excited positive-parity band.

A.V. and L.K. are supported by the BCGS.