Study on Deformation and Shape Coexistence for 188Pb

  • The deformation and shape coexistence in 188Pb have been investigated in terms of the Projected Shell Model. Comparing the experimental data with the calculated results, it is shown that three shape configurations of sphere (Z=82 shell closure), oblate (two particle-two hole in proton h9/2 orbital) and prolate (multi-particle-hole)coexist each other in the low-lying excited states and the prolate band exhibits a mixture between two kinds of multi-particle-hole configurations, which means that the neutron i13/2 alignment happens gradually in this case. The mixing is discussed and the mixing coefficients are given. The oblate band structure is predicted and the 2+ prolate state is estimated to be in the energy range of 804—80keV.
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  • [1] Wood J L, Heyde K, Nazarewicz W et al. Phys. Rep., 1992, 215: 101 2 Nazarewicz W, Phys. Lett., 1993, B305: 1953 Heese J, Maier K H, Grawe H et al. Phys. Lett., 1993, B302:3904 Bijnens N, Ahmad L, Andreyev A N et al. Z. Phys.,1996, A356:3 5 Allatt R G, Page R D, Leino M et al. Phys. Lett., 1998, B437:29 6 Hara K, Sun Y. Int. J. Mod. Phys., 1995, A642:387 7 ZHANG J Y, XU N, Fossan D B et al. Phys. Rev., 1989, C39:714
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CHEN XueShi, ZHANG XiaoDong, SHEN ShuiFa, SHI ShuangHui and GU JiaHui. Study on Deformation and Shape Coexistence for 188Pb[J]. Chinese Physics C, 2000, 24(4): 364-368.
CHEN XueShi, ZHANG XiaoDong, SHEN ShuiFa, SHI ShuangHui and GU JiaHui. Study on Deformation and Shape Coexistence for 188Pb[J]. Chinese Physics C, 2000, 24(4): 364-368. shu
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Received: 1999-09-21
Revised: 1900-01-01
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Study on Deformation and Shape Coexistence for 188Pb

    Corresponding author: CHEN XueShi,
  • Shanghai Institute of Nuclear Research, The Chinese Academy of Sciences,Shanghai 201800, China

Abstract: The deformation and shape coexistence in 188Pb have been investigated in terms of the Projected Shell Model. Comparing the experimental data with the calculated results, it is shown that three shape configurations of sphere (Z=82 shell closure), oblate (two particle-two hole in proton h9/2 orbital) and prolate (multi-particle-hole)coexist each other in the low-lying excited states and the prolate band exhibits a mixture between two kinds of multi-particle-hole configurations, which means that the neutron i13/2 alignment happens gradually in this case. The mixing is discussed and the mixing coefficients are given. The oblate band structure is predicted and the 2+ prolate state is estimated to be in the energy range of 804—80keV.

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