EXOTIC CLUSTERING IN U-232,U-234,U-236,U-238

摘要

We account for the energies and electromagnetic E2 transitions of the J(pi) = 0(+), 2(+), 4(+) ... ground state bands of U-232,U-234,U-236,U-238, using a model in which these bands are treated in terms of a Ne-24 cluster orbiting the appropriate Pb core. The cluster-core potential parameters used are identical to those employed in a previous study of Ra-222,Ra-224,Ra-226. In addition to the simultaneous fitting of energies and B(E2) strengths, we also obtain good agreement with the measured half-life for the Ne-24 decay of the 0(+) ground state of U-232 and U-235 as well as with the measured B(E4 up arrow; 0(+) --> (4+)) transition strengths in U-234,U-236. We find that a small parity dependence of the cluster-core potential is required in order to give a good account of the energies of the J(pi) = 1(-), 3(-), 5(-), ... states of the lowest negative parity band of U-232,U-234,U-236,U-238 and of the B(E3 up arrow; 0(+) --> 3(-)) strengths in U-234,U-236,U-238. (C) 1997 Elsevier Science B.V. [References: 17]