Excited states and signature inversion in Cs116

J. F. Smith, C. J. Chiara, M. P. Carpenter, C. N. Davids, M. Devlin, D. B. Fossan, S. J. Freeman, R. V F Janssens, D. R. LaFosse, D. G. Sarantites, D. Seweryniak, K. Starosta, R. Wadsworth, A. N. Wilson, R. Wyss

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    Abstract

    Excited states have been observed for the first time in the very neutron-deficient, odd-odd nucleus, 55116Cs61. The assignment to Cs116 has been made by the detection of γ rays in coincidence with evaporated charged particles and with evaporation residues. The observed states form a rotational band which has been assigned to the ν(h11/2)π(h11/2) configuration. Tentative spin assignments have been made on the basis of systematic comparisons with neighboring cesium isotopes. A low-spin signature inversion is observed in the band at a rotational frequency of about 0.23 MeV/. The observed signature inversions in the odd-odd Cs116-126 isotopes have been compared with the results of extended total Routhian surface calculations, in which signature inversion arises as a consequence of quadrupole-pairing correlations and triaxial deformation. As previously shown for some of the odd-odd 120 isotopes, the calculations reproduce the signature inversions reasonably well. © 2006 The American Physical Society.
    Original languageEnglish
    Article number034310
    JournalPhysical Review C - Nuclear Physics
    Volume74
    Issue number3
    DOIs
    Publication statusPublished - 2006

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