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Phys. Rev. C 74, 034310 (2006) [10 pages]

Excited states and signature inversion in 116Cs

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J. F. Smith1,*, C. J. Chiara2,3, M. P. Carpenter4, C. N. Davids4, M. Devlin3,5, D. B. Fossan2, S. J. Freeman1, R. V. F. Janssens4, D. R. LaFosse2, D. G. Sarantites3, D. Seweryniak4, K. Starosta6, R. Wadsworth7, A. N. Wilson7,†, and R. Wyss8
1Schuster Laboratory, University of Manchester, Manchester, M13 9PL, United Kingdom
2Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794, USA
3Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
4Argonne National Laboratory, Argonne, Illinois 60439, USA
5LANSCE-3, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
6National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48854, USA
7Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom
8Royal Institute of Technology, Physics Department Frescati, Frescativägen 24, S-104 05 Stockholm, Sweden

Received 16 September 2005; published 12 September 2006

Excited states have been observed for the first time in the very neutron-deficient, odd-odd nucleus, 55116Cs61. The assignment to 116Cs 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/ℏ. The observed signature inversions in the odd-odd 116-126Cs 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≃120 isotopes, the calculations reproduce the signature inversions reasonably well.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.74.034310
DOI:
10.1103/PhysRevC.74.034310
PACS:
21.10.Re, 23.20.Lv, 27.60.+j, 29.30.Kv

*Electronic address: John.F.Smith@Manchester.ac.uk

†Present address: Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra ACT 0200, Australia.

 
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