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 lβ2l = 0.29(5) and lβ2l = 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.
Copyright © 2010 The American Physical Society. This article first appeared in Physical Review Letters 97, no. 6 (August 7, 2006): 062501: 1-62501: 4. doi:10.1103/PhysRevLett.97.062501.
Please note that downloads of the article are for private/personal use only.
Grahn, T., A. Dewald, O. Möller, R. Julin, C. Beausang, S. Christen, I. Darby, S. Eeckhaudt, P. Greenlees, A. Görgen, K. Helariutta, J. Jolie, P. Jones, S. Juutinen, H. Kettunen, T. Kröll, R. Krücken, Y. Coz, M. Leino, A.-P. Leppänen, P. Maierbeck, D. Meyer, B. Melon, P. Nieminen, M. Nyman, R. Page, J. Pakarinen, P. Petkov, P. Rahkila, B. Saha, M. Sandzelius, J. Sarén, C. Scholey, and J. Uusitalo. "Collectivity and Configuration Mixing in Pb186,188 and Po194." Physical Review Letters 97, no. 6 (August 7, 2006): 062501: 1-62501: 4. doi:10.1103/PhysRevLett.97.062501.