First evidence for smooth band termination in valence space in the mass 130 region: Spectroscopy of 127La

C. M. Parry*, R. Wadsworth, A. N. Wilson, A. J. Boston, P. J. Nolan, E. S. Paul, J. A. Sampson, A. T. Semple, C. Foin, J. Genevey, A. Gizon, J. Gizon, I. Ragnarsson, B. G. Dong

*Corresponding author for this work

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High spin states in 127La have been studied using the 32S(100Mo,p4n) reaction at a beam energy of 155 MeV. Gamma rays were detected using the EUROBALL III spectrometer. One of the side bands in 127La is observed to be populated to a spin of 83/2+. These data are compared with cranked Nilsson-Strutinski calculations which suggest that the structure is a smoothly terminating band, in valence space, based upon a π[(g7/2d5/2)5(h11/2)2]⊗ ν[(g7/2d5/2)12(h11/2)6(d3/2s1/2)2] configuration, which can carry a maximum spin of 47.5ℏ. This is the first identification of such a structure in this mass region.

Original languageEnglish
Article number021303
Pages (from-to)213031-213035
Number of pages5
JournalPhysical Review C - Nuclear Physics
Issue number2
Publication statusPublished - Feb 2000

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