Studies of multi-quasiparticle K-isomers in rare-earth and trans-fermium nucleiF.G. Kondev1, G.D. Dracoulis2, T.L. Khoo3, G.J. Lane2, A.P. Byrne2, T. Kibédi2, I. Ahmad3, B. Back3, M.P. Carpenter3, R.V.F. Janssens3, T. Lauritsen3, C.J. Lister3, D. Peterson3, D. Seweryniak3, S. Zhu1, 3, P. Chowdhury4 and S.K. Tandel4
1 Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
2 Department of Nuclear Physics, R.S.Phys.S.E, Australian National University, Canberra, ACT 0200, Australia
3 Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
4 Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA
Published online: 21 May 2008
Nuclear K-isomers play an important role in understanding the structure of deformed axially symmetric nuclei. Examples are presented of recent studies in the rare-earth region (A~180) using deep-inelastic and multi-nucleon transfer reactions, and in the trans-fermium region (A~250) using fusion-evaporation reactions. A specific two-level mixing scenario is invoked to explain the unusual decay of the Kπ = 13+ isomer in 174Lu. The identification of 2- and 4-quasiparticle isomers in 254No is discussed and predictions of similar isomers in neighboring No and Rf nuclei are presented.
© CEA 2008