First observation of excited states in {sup 118}Ba: Possible evidence for octupole correlations in neutron-deficient barium isotopes

Journal Article · Sun Mar 01 04:00:00 EST 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.57.R1037· OSTI ID:580063

Smith, J F; Chiara, C J; Fossan, D B; Lane, G J; Sears, J M; Thorslund, I ^[1]; Amro, H; Davids, C N; Janssens, R V; Seweryniak, D ^[2]; Hibbert, I M; Wadsworth, R ^[3]; Lee, I Y; Macchiavelli, A O ^[4]

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1. Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800 (United States)
2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Department of Physics, University of York, Heslington, York, YO15DD (United Kingdom)
4. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

Excited states have been observed for the first time in the very neutron-deficient {sup 118}Ba nuclide. The ground-state band and a side band have been observed up to spins 20 and 17 {h_bar}, respectively. The bands have been assigned to {sup 118}Ba using gamma-recoil and gamma-x ray coincidences. Excitation-energy systematics suggest that the ground state of {sup 118}Ba is less deformed than that of {sup 120}Ba. The side band decays into the ground-state band via three transitions, which are presumed to have E1 character. The occurrence of E1 transitions and negative-parity states in the very neutron-deficient barium (Z=56) isotopes is discussed with respect to the possible onset of octupole correlations. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 580063
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 3 Vol. 57; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
66 PHYSICS
BARIUM 118
CORRELATIONS
DEFORMATION
DEFORMED NUCLEI
E1-TRANSITIONS
EXCITED STATES
GROUND STATES
NEUTRON-DEFICIENT ISOTOPES
OCTUPOLES
PARITY