Level structures of Rh110,111,112,113 from measurements on Cf252

Y. X. Luo, S. C. Wu, J. Gilat, J. O. Rasmussen, J. H. Hamilton, A. V. Ramayya, J. K. Hwang, C. J. Beyer, S. J. Zhu, J. Kormicki, X. Q. Zhang, E. F. Jones, P. M. Gore, I-Yang Lee, P. Zielinski, C. M. Folden, III, T. N. Ginter, P. Fallon, G. M. Ter-Akopian, A. V. Daniel, M. A. Stoyer, J. D. Cole, R. Donangelo, S. J. Asztalos, and A. Gelberg
Phys. Rev. C 69, 024315 – Published 27 February 2004

Abstract

Level schemes of Rh111 and Rh113 are proposed from the analysis of γγγ coincidence data from a Cf252 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-γ work. From these data, information on shapes is inferred. By analogy with lighter Z=45 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 Rh111 and Rh113 with the triaxial-rotor-plus-particle model. The 72+πg92 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 γ28°. For the K=12+[431] band, experiment and model calculations do not fit well, which is accounted for by greater prolate deformation of the K=12+ band, a case of shape coexistence. Our data on Rh110,112 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 h112 neutron pair. In Rh111,113 above the band crossing (spins 212) 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.

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  • Received 24 August 2003

DOI:https://doi.org/10.1103/PhysRevC.69.024315

©2004 American Physical Society

Authors & Affiliations

Y. X. Luo1,2,3,4, S. C. Wu4,5, J. Gilat4, J. O. Rasmussen4, J. H. Hamilton1, A. V. Ramayya1, J. K. Hwang1, C. J. Beyer1, S. J. Zhu1,3,6, J. Kormicki1, X. Q. Zhang1, E. F. Jones1, P. M. Gore1, I-Yang Lee4, P. Zielinski4, C. M. Folden, III4, T. N. Ginter4, P. Fallon4, G. M. Ter-Akopian7, A. V. Daniel7, M. A. Stoyer8, J. D. Cole9, R. Donangelo10, S. J. Asztalos11, and A. Gelberg12

  • 1Physics Department, Vanderbilt University, Nashville, Tennessee 37235, USA
  • 2Institute of Modern Physics, Chinese Academy of Science, Lanzhou, China
  • 3Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37830, USA
  • 4Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
  • 6Physics Department, Tsinghua University, Beijing 100084, People’s Republic of China
  • 7Flerov Laboratory for Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Russia
  • 8Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 9Idaho National Environmental and Engineering Laboratory, Idaho Falls, Idaho 83415, USA
  • 10Instituto de Física da Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21941-972 Rio de Janeiro, Brazil
  • 11Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 12Institut für Kernphysik, Universität zu Köln, 50937 Cologne, Germany

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Vol. 69, Iss. 2 — February 2004

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