Study on Deformation and Shape Coexistence for <SUP>188</SUP>Pb

CHEN XueShi; ZHANG XiaoDong; SHEN ShuiFa; SHI ShuangHui; GU JiaHui

Chinese Physics C> 2000, Vol. 24> Issue(4) : 364-368

Study on Deformation and Shape Coexistence for ¹⁸⁸Pb

Shanghai Institute of Nuclear Research, The Chinese Academy of Sciences,Shanghai 201800, China

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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 h_9/2 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 i_13/2 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.

References

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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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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 1999-09-21
Accepted Date: 1900-01-01
Available Online: 2000-04-05

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 h_9/2 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 i_13/2 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.