Acta Physica Polonica B

Vol. 32, No. 3, March 2001, page 1019

Gamma-Ray Spectroscopy of 191,193Bi

P. Nieminen, J.F.C. Cocks, O. Dorvaux, P.T. Greenlees, K. Helariutta, P.M. Jones, R. Julin, S. Juutinen, H. Kankaanpaeae, H. Kettunen, P. Kuusiniemi, M. Leino, M. Muikku, P. Rahkila, A. Savelius, J. Uusitalo, A.N. Andreyev, F. Becker, K. Eskola, K. Hauschild, M. Houry, M. Huyse, W. Korten, Y. Le Coz, R. Lucas, T. Loennroth, Ch. Theisen, K. van de Vel, P. van Duppen, N. Amzal, P.A. Butler, N. Hammond, C. Scholey, R. Wyss

Very neutron-deficient 191,193Bi nuclei have been studied at the Department of Physics, University of Jyvaeskylae, Finland (JYFL) employing the Jurosphere II Ge-detector array coupled to the gas-filled recoil separator RITU and different tagging techniques. For the first time in heavy odd-mass nuclei, a collective band (oblate) is identified above the 2p--1h (1/2+) proton intruder state in 191Bi. In both 191,193Bi, a band based on isomeric 13/2+ state has been observed and oblate deformation for this state has been deduced.

PACS numbers: 23.20.Lv, 27.80.+w

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