Collectivity and configuration mixing in 186,188Pb and 194Po

Grahn, T; Dewald, A; Moeller, O; Julin, Rauno Juhani; Beausang, C; Christen, S; Darby, I G; Eeckhaudt, S; Greenlees, P; Gorgen, A; Helariutta, K; Jolie, J; Jones, Peter G; Juutinen, S; Kettunen, H; Kroll, T; Krucken, R; Le Coz, Y; Leino, M; Leppanen, A.P; Meierbeck, P; Meyer, D A; Melon, B; Nieminen, Paivi; Nyman, M; Page, R.D; Pakarinen, J; Petkov, P; Rahkila, P; Saha, B; Sandzelius, M; Saren, J; Scholey, C; Uusitalo, J

Collectivity and configuration mixing in 186,188Pb and 194Po

Date

2006-08-07

Authors

Grahn, T

Dewald, A

Moeller, O

Julin, Rauno Juhani

Beausang, C

Christen, S

Darby, I G

Eeckhaudt, S

Greenlees, P

Gorgen, A

Publisher

American Physical Society

Abstract

Lifetimes of prolate intruder states in 186Pb and oblate intruder states in 194Po have been determined by employing, for the first time, the recoil-decay tagging technique in recoil distance Doppler-shift lifetime measurements. In addition, lifetime measurements of prolate states in 188Pb up to the 8+ state were carried out using the recoil-gating method. The B(E2) values have been deduced from which deformation parameters |β2|=0.29(5) and |β2|=0.17(3) for the prolate and the oblate bands, respectively, have been extracted. The results also shed new light on the mixing between different shapes.