High-spin states and collective oblate bands in Nd139

Q. Xu, S. J. Zhu, X. L. Che, J. G. Wang, H. B. Ding, L. Gu, L. H. Zhu, X. G. Wu, Y. Liu, C. Y. He, and G. S. Li
Phys. Rev. C 78, 034310 – Published 16 September 2008

Abstract

High spin states in Nd139 nucleus have been reinvestigated with the reaction Te128 (O16, 5n) at a beam energy of 90 MeV. The level scheme has been expanded with spin up to 47/2. At low spin, the yrast collective structure built on the νh11/21 multiplet shows a triaxial shape with γ32° according to calculations of the triaxial rotor-plus-particle model. The configurations for some high spin states have been discussed from a systematic comparison with neighboring nuclei. Three collective oblate bands with γ~60° at high spin were identified for the first time. A band crossing is observed around ω~0.4 MeV in one oblate band based on the 25/2 level. The characteristics for these oblate bands have been discussed.

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  • Received 20 May 2008

DOI:https://doi.org/10.1103/PhysRevC.78.034310

©2008 American Physical Society

Authors & Affiliations

Q. Xu1, S. J. Zhu1,*, X. L. Che1, J. G. Wang1, H. B. Ding1, L. Gu1, L. H. Zhu2, X. G. Wu2, Y. Liu2, C. Y. He2, and G. S. Li2

  • 1Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China
  • 2China Institute of Atomic Energy, Beijing 102413, People's Republic of China

  • *zhusj@mail.tsinghua.edu.cn

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Vol. 78, Iss. 3 — September 2008

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