Identification of excited states in ¹¹⁷Cs: Systematics of the ν(h_11/2)² alignment

TY - JOUR

T1 - Identification of excited states in 117Cs

T2 - Systematics of the ν(h11/2)2 alignment

AU - Smith, J. F.

AU - Medina-Chico, V.

AU - Chiara, C. J.

AU - Fossan, D. B.

AU - Lane, G. J.

AU - Sears, J. M.

AU - Thorslund, I.

AU - Amro, H.

AU - Davids, C. N.

AU - Janssens, R. V.F.

AU - Seweryniak, D.

AU - Hibbert, I. M.

AU - Wadsworth, R.

AU - I Y, Lee

AU - Macchiavelli, A. O.

PY - 2001/2

Y1 - 2001/2

N2 - Excited states have been identified in the very neutron-deficient 11755Cs62 nucleus. High-spin spectroscopy has been performed using the Gammasphere array, and the assignment of gamma-ray transitions to 117Cs 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 π(h11/2)[550]1/2- band of 117Cs. Two additional bands have been observed and are tentatively assigned to be based on protons in the [404]9/2+ and [422]3/2+ orbitals. Alignments of pairs of h11/2 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 ν(h11/2)2 alignment in the π[550]1/2- band and of the π(h11/2)2 alignment in the [422]3/2+ band. The frequencies of these alignments can be qualitatively explained only if a neutron-proton interaction is taken into account.

AB - Excited states have been identified in the very neutron-deficient 11755Cs62 nucleus. High-spin spectroscopy has been performed using the Gammasphere array, and the assignment of gamma-ray transitions to 117Cs 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 π(h11/2)[550]1/2- band of 117Cs. Two additional bands have been observed and are tentatively assigned to be based on protons in the [404]9/2+ and [422]3/2+ orbitals. Alignments of pairs of h11/2 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 ν(h11/2)2 alignment in the π[550]1/2- band and of the π(h11/2)2 alignment in the [422]3/2+ band. The frequencies of these alignments can be qualitatively explained only if a neutron-proton interaction is taken into account.

UR - http://www.scopus.com/inward/record.url?scp=14344270755&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:14344270755

SN - 0556-2813

VL - 63

SP - 243191

EP - 2431911

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 2

M1 - 024319

ER -