Level structures of Rh-110,Rh-111,Rh-112,Rh-113 from measurements on Cf-252
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Level schemes of [Formula Presented] and [Formula Presented] are proposed from the analysis of [Formula Presented] coincidence data from a [Formula Presented] spontaneous fission source with Gammasphere. These schemes have the highest excitation energies and spins yet established in these nuclei, as well as weakly populated bands not reported in earlier fission-[Formula Presented] work. From these data, information on shapes is inferred. By analogy with lighter [Formula Presented] odd-even isotopes, tentative spins and parities are assigned to members of several rotational bands. In this region triaxial nuclear shapes are known to occur, and we carried out calculations for [Formula Presented] and [Formula Presented] with the triaxial-rotor-plus-particle model. The [Formula Presented] bands of both nuclei, as well as lighter isotopes studied by others, show similar signature splitting. Our model calculations give a reasonable fit to the signature splitting, collective sidebands, and transition probabilities at near-maximum triaxiality with [Formula Presented]. For the [Formula Presented] band, experiment and model calculations do not fit well, which is accounted for by greater prolate deformation of the [Formula Presented] band, a case of shape coexistence. Our data on [Formula Presented] show no backbending and thus support the idea of the band crossing in the ground band of the odd-A neighbors being due to alignment of an [Formula Presented] neutron pair. In [Formula Presented] above the band crossing (spins [Formula Presented]) the ground band appears to split, with two similar branches. We consider the possibility that chiral doubling may be involved, but there are not enough levels to determine that. 2004 The American Physical Society.
author list (cited authors)
Luo, Y. X., Wu, S. C., Gilat, J., Rasmussen, J. O., Hamilton, J. H., Ramayya, A. V., ... Gelberg, A.
complete list of authors
Luo, YX||Wu, SC||Gilat, J||Rasmussen, JO||Hamilton, JH||Ramayya, AV||Hwang, JK||Beyer, CJ||Zhu, SJ||Kormicki, J||Zhang, XQ||Jones, EF||Gore, PA||Lee, IY||Zielinski, P||Folden, CM||Ginter, TN||Fallon, P||Ter-Akopian, GM||Daniel, AV||Stoyer, MA||Cole, JD||Donangelo, R||Asztalos, SJ||Gelberg, A