Lifetimes of the 4+states of 206Po and 204Po: a study of the transition from noncollective seniority-like mode to collectivity

M. Stoyanova, G. Rainovski*, J. Jolie, N. Pietralla, A. Blazhev, M. Beckers, A. Dewald, M. Djongolov, A. Esmaylzadeh, C. Fransen, L.M. Gerhard, K.A. Gladnishki, S. Herb, P.R. John, V. Karayonchev, J.M. Keatings, R. Kern, L. Knafla, D. Kocheva, L. KornwebelTh. Kröll, M. Ley, K.M. Mashtakov, C. Müller-Gatermann, J.-M. Régis, M. Scheck, K. Schomacker, J. Sinclair, P. Spagnoletti, C. Sürder, N. Warr, V. Werner, J. Wiederhold

*Corresponding author for this work

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Abstract

Low-lying yrast states of 204Po and 206Po were investigated by the γ–γ fast timing technique with LaBr3(Ce) detectors. Excited states of these nuclei were populated in the 197Au(11B,4n) 204Po and the 198Pt(12C,4n) 206Po fusion-evaporation reactions, respectively. The beams were delivered by the FN-Tandem accelerator at the University of Cologne. The lifetimes of the 4+1 states of both nuclei were measured, along with an upper lifetime limit for the 2+1 state of 204Po. A comparison between the derived B(E2;4+1→2+1) values and results from simplified empirical two-state mixing calculations suggests that for the 4+1 states of even-even polonium isotopes the transition from single-particle mode at
N=126 to collective mode, when reducing the number of neutrons, occurs above N=122.
Original languageEnglish
Article number064304
Pages (from-to)064304
JournalPhysical Review C
Volume100
Issue number6
DOIs
Publication statusPublished - 6 Dec 2019

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