Smooth band termination in odd mass La nuclei: 127,129,131La

R. Wadsworth, E. S. Paul, A. Astier, D. Bazzacco, A. J. Boston, N. Buforn, C. J. Chiara, D. B. Fossan, C. Fox, J. Gizon, D. G. Jenkins, N. S. Kelsall, T. Koike, D. R. LaFosse, S. Lunardi, P. J. Nolan, B. M. Nyakó, C. M. Petrache, H. Scraggs, K. StarostaJ. Timár, A. Walker, A. N. Wilson, L. Zolnai, B. G. Dong, I. Ragnarsson

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Abstract

High spin states in 127,129,131La have been investigated using the 100Mo(32S,p4n), E= 160 MeV, 100Mo(34S,p4n), E=155 MeV, and 100Mo(36S,p4n), E=160 MeV reactions, respectively. γ rays were detected using the EUROBALL IV (127,131La) and EUROGAM II (129La) arrays. The results have enabled the negative parity yrast band, built on the πh 11/2 orbital at low spin, and the lowest lying (π, α) = (+, ± 1/2) bands to be extended to higher spins. The positive parity, α= - 1/2, bands in 127,129La and the positive parity, α= 1/2, band in 127La can be interpreted, with the aid of cranked Nilsson-Strutinsky calculations, as examples of smoothly terminating bands in valence space based on both signatures of the π[(g7/2d5/2)5(h11/2)2] ⊗v[(g7/2d5/2)x(h11/2)6(d3/2s1/2)2] configuration, where x= 12, 14 for 127,129La, respectively. The favored α = - 1/2 bands of these configurations are predicted to terminate at 95/2+ and 83/2+, respectively, and experimentally the bands are observed to within two transitions of these terminating states. The data for the positive parity, α= 1/2, band in 129La do not allow any firm conclusions to be made regarding the high spin structure of this band. The positive parity bands in 131La have a different structure at high spin compared with the lighter nuclei. In this case the bands may be interpreted in terms of a π[(g7/2d5/2)5(h11/2)2] ⊗v[(g7/2d5/2)12(h11/2)8(d3/2s1/2)4] configuration relative to a 100Sn core.

Original languageEnglish
Article number034315
Pages (from-to)343151-343157
Number of pages7
JournalPhysical Review C - Nuclear Physics
Volume62
Issue number3
Publication statusPublished - Sep 2000

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Wadsworth, R., Paul, E. S., Astier, A., Bazzacco, D., Boston, A. J., Buforn, N., Chiara, C. J., Fossan, D. B., Fox, C., Gizon, J., Jenkins, D. G., Kelsall, N. S., Koike, T., LaFosse, D. R., Lunardi, S., Nolan, P. J., Nyakó, B. M., Petrache, C. M., Scraggs, H., ... Ragnarsson, I. (2000). Smooth band termination in odd mass La nuclei: 127,129,131La. Physical Review C - Nuclear Physics, 62(3), 343151-343157. [034315].