Identification of excited states in {sup 117}Cs: Systematics of the {nu}(h{sub 11/2}){sup 2} alignment

Journal Article · Thu Feb 01 04:00:00 EST 2001 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.63.024319· OSTI ID:40206134

Smith, J F; Medina-Chico, V; Chiara, C J; Fossan, D B; Lane, G J; Sears, J M; Thorslund, I; Amro, H; Davids, C N; Janssens, R V. F. ^[1]

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1. and others

Excited states have been identified in the very neutron-deficient {sub 55}{sup 117}Cs{sub 62} nucleus. High-spin spectroscopy has been performed using the Gammasphere array, and the assignment of gamma-ray transitions to {sup 117}Cs has been made in a separate experiment in which gamma rays were detected in coincidence with x rays and with recoiling evaporation residues. A previously observed sequence of five gamma rays has been extended by 11 transitions, to high spin, and has been identified as the yrast {pi}(h{sub 11/2})[550]1/2{sup -} band of {sup 117}Cs. Two additional bands have been observed and are tentatively assigned to be based on protons in the [404]9/2{sup +} and [422]3/2{sup +} orbitals. Alignments of pairs of h{sub 11/2} neutrons and protons are observed in all of the bands. The alignments are compared to cranked Woods-Saxon calculations, and are discussed with respect to the effects of a neutron-proton interaction. Of particular interest are the features of the {nu}(h{sub 11/2}){sup 2} alignment in the {pi}[550]1/2{sup -} band and of the {pi}(h{sub 11/2}){sup 2} alignment in the [422]3/2{sup +} band. The frequencies of these alignments can be qualitatively explained only if a neutron-proton interaction is taken into account.

• Sponsoring Organization: (US)
• OSTI ID: 40206134
• Journal Information: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 63; ISSN 0556-2813
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALIGNMENT
EVAPORATION
EXCITED STATES
NEUTRONS
PROTONS
RESIDUES
SPECTROSCOPY
SPIN