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Identification of band structures in the 137La nucleus |
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| Authors: | M. L. Li S. J. Zhu S. D. Xiao X. L. Che Y. N. U Y. J. Chen H. B. Ding L. H. Zhu G. S. Li S. X. Wen X. G. Wu |
| Affiliation: | (1) Department of Physics, Tsinghua University, 100084 Beijing, PRC;(2) China Institute of Atomic Energy, 102413 Beijing, PRC |
| Abstract: | High-spin states of 137La have been investigated with the reaction 130Te(11B, 4n) at a beam energy of 50MeV. The level scheme of 137La has been expanded with spin up to 33/2ℏ. Several new bands have been found in this nucleus. A band crossing in the band based on the 17/2- level has been observed at a rotational frequency of ℏω ∼ 0.48MeV. From systematic comparison, this band crossing probably originates from the alignment of protons. One of the bands with strong M1 transitions is proposed as a collective oblate band ( γ ∼ -60°). |
| Keywords: | 23.20.Lv Gamma transitions and level energies 21.10.Re Collective levels 21.60.Ev Collective models |
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