Phys.Rev. C 100, 064304 (2019)

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.Kornwebel, Th.Kroll, M.Ley, K.M.Mashtakov, C.Muller-Gatermann, J.-M.Regis, M.Scheck, K.Schomacker, J.Sinclair, P.Spagnoletti, C.Surder, N.Warr, V.Werner, J.Wiederhold

Lifetimes of the 4⁺₁ states of ²⁰⁶Po and ²⁰⁴Po: A study of the transition from noncollective seniority-like mode to collectivity

NUCLEAR REACTIONS ¹⁹⁷Au(¹¹B, 4n)²⁰⁴Po, E=55 MeV; ¹⁹⁸Pt(¹²C, 4n)²⁰⁶Po, E=65 MeV; measured Eγ, Iγ, γγ-coin, level half-lives by γγ(t) fast timing technique using the HORUS spectrometer of the FN Tandem facility at the University of Cologne. ^204,206Po; deduced levels, J, π, B(E2) for the first 4+ states in both the isotopes, and for the first 2+ in ²⁰⁴Po, configurations; discussed transition from single-particle seniority like mode to collective mode. Comparison with two-state mixing calculations. Systematics of energies, R_4/2 ratios, B(E2) and magnetic moments for the yrast levels in ^{200,202,204,206,208,210}Po.

doi: 10.1103/PhysRevC.100.064304