Excited states and signature inversion in {sup 116}Cs

Journal Article · Fri Sep 15 04:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.74.034310· OSTI ID:20863782

Smith, J F; Freeman, S J ^[1]; Chiara, C J ^[2]; Carpenter, M P; Davids, C N; Janssens, R V. F.; Seweryniak, D ^[3]; Devlin, M ^[4]; Fossan, D B; LaFosse, D R ^[2]; Sarantites, D G ^[4]; Starosta, K ^[5]; Wadsworth, R; Wilson, A N ^[6]; Wyss, R ^[7]

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1. Schuster Laboratory, University of Manchester, Manchester, M13 9PL (United Kingdom)
2. Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794 (United States)
3. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
4. Department of Chemistry, Washington University, St. Louis, Missouri 63130 (United States)
5. National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48854 (United States)
6. Department of Physics, University of York, Heslington, York, YO10 5DD (United Kingdom)
7. Royal Institute of Technology, Physics Department Frescati, Frescativaegen 24, S-104 05 Stockholm (Sweden)

Excited states have been observed for the first time in the very neutron-deficient, odd-odd nucleus, {sub 55}{sup 116}Cs{sub 61}. The assignment to {sup 116}Cs 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{sub 11/2}) (multiply-in-circle sign) {pi}(h{sub 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/({Dirac_h}/2{pi}). The observed signature inversions in the odd-odd {sup 116-126}Cs 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{approx_equal}120 isotopes, the calculations reproduce the signature inversions reasonably well.

• OSTI ID: 20863782
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 74; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CESIUM 116
CESIUM 126
CHARGED PARTICLES
COMPARATIVE EVALUATIONS
CORRELATIONS
EVAPORATION MODEL
GAMMA RADIATION
MEV RANGE
NEUTRONS
NUCLEAR DEFORMATION
QUADRUPOLES
ROTATIONAL STATES
SPIN
SURFACES