Excited states and signature inversion in Cs-116

QC 20100525
Excited states have been observed for the first time in the very neutron-deficient, odd-odd nucleus, Cs-116(55)61. The assignment to Cs-116 has been made by the detection of gamma rays in coincidence with evaporated charged particles and with evaporation residues. The observed states form a rotational band which has been assigned to the nu(h(11/2)) circle times pi(h(11/2)) 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/h. 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 A similar or equal to 120 isotopes, the calculations reproduce the signature inversions reasonably well.

By the author/editor: Smith, J. F.; Chiara, C. J.; Carpenter, M. P.; Davids, C. N.; Devlin, M.; Fossan, D. B.; show more...; Freeman, S. J.; Janssens, R. V. ...; LaFosse, D. R.; Sarantites, D. G ...; Seweryniak, D.; Starosta, K.; Wadsworth, R.; Wilson, A. N.; Wyss, Ramon; show less...

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