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Chinese Physics C> 2002, Vol. 26> Issue(3) : 266-272 

Shape Coexistence and Band Termination in 131La

  •  China Institute of Atomic Energy, Beijing 102413, China

  • The configuration-dependent cranked Nilsson-Strutinsky model is used to study the band structures in 131La. Shape coexistence and band termination are investigated for several configurations. The calculations indicate that 131La is a γ-soft nucleus. The theoretical results are compared with experimental data. The calculated π(h11/2)2⊙ν(h11/2)8 configuration with (π,α)=(+,－1/2) shows very good agreement with the experimental band observed to highest spin. The termination of this band is not favored, i.e. a relatively large energy is required to build the highest spin states in the band.
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    [1] Paul F S, Beausang C W, Fossan D B et al. Phys. Rev. Lett., 1987, 58: 9842 Hildingsson L. Beausang C W, Fossan D B et al. Phys. Rev. 1989, C39: 4713 Wadaworth R, Paul E S. Boston A J et al. Phys. Rev., 2000, C62:0343154 DONG Bao-Guo, GUO Hong-Chao, Ragnarnaon Ingemar. Nucl. Phys. Rev., 2000, 17(4): 216(in Chinese)(董保国. 郭宏超. Ragnarseon Ingemar. 原子核物理评论, 2000, 17(4): 216)5 Parry C M, Wadsworth R, Wilson A N et al. Phys. Rev, 2000, C61:021303(R)6 Bengtsaon T, Ragnarsaon I. Nucl. Phys., 1985, A436: 14

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DONG Bao-Guo, GUO Hong-Chao and Ingemar Ragnarsson. Shape Coexistence and Band Termination in 131La[J]. Chinese Physics C, 2002, 26(3): 266-272.
DONG Bao-Guo, GUO Hong-Chao and Ingemar Ragnarsson. Shape Coexistence and Band Termination in 131La[J]. Chinese Physics C, 2002, 26(3): 266-272. shu
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Received: 2001-03-27
Revised: 1900-01-01
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Shape Coexistence and Band Termination in 131La

    Corresponding author: DONG Bao-Guo,
  • China Institute of Atomic Energy, Beijing 102413, China
  • Received Date: 2001-03-27
  • Accepted Date: 1900-01-01
  • Available Online: 2002-03-05

Abstract: The configuration-dependent cranked Nilsson-Strutinsky model is used to study the band structures in 131La. Shape coexistence and band termination are investigated for several configurations. The calculations indicate that 131La is a γ-soft nucleus. The theoretical results are compared with experimental data. The calculated π(h11/2)2⊙ν(h11/2)8 configuration with (π,α)=(+,－1/2) shows very good agreement with the experimental band observed to highest spin. The termination of this band is not favored, i.e. a relatively large energy is required to build the highest spin states in the band.

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