Chinese Physics C > 2017, Vol. 41 > Issue(6): 064103 DOI: 10.1088/1674-1137/41/6/064103

Signatures of shell evolution in alpha decay across theN=126 shell closure

1.
Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China
2.
Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China
3.
Key Laboratory of Modern Acoustics and Department of Physics, Nanjing University, Nanjing 210093, China
4.
Key Laboratory of Modern Acoustics and Department of Physics, Nanjing University, Nanjing 210093, China
5.
Kavli Institute for Theoretical Physics China, Beijing 100190, China
6.
Center of Theoretical Nuclear Physics, National Laboratory of Heavy-Ion Accelerator, Lanzhou 730000, China

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Abstract：
Within the alpha-cluster model, we particularly investigate the alpha decay of exotic nuclei in the vicinity of the N=126 neutron shell plus the Z=82 proton shell. The systematics of alpha-preformation probability ( P _α), as an indicator of the shell effect, is deduced from the ratio of the experimental decay width to the calculated one. Through the comparative analysis of the P _αtrend in the N=124-130 isotonic chain, the N=126 and Z=82 shell closures are believed to strongly affect the formation of the alpha particle before its penetration. Additionally, the P _αvariety in Po and Rn isotopes is presented as another proof for such an influence. More importantly, it may be concluded that the expected neutron (or proton) shell effect gradually fades away along with the increasing valence proton (or neutron) number. The odd-even staggering presented in the P _αvalue is also discussed.
- alpha-preformation factor,
- shell effect,
- cluster model

References

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Rui-Wang, Rui-Yao Wang, Yi-Bin Qian and Zhong-Zhou Ren. Signatures of shell evolution in alpha decay across the N=126 shell closure[J]. Chinese Physics C, 2017, 41(6): 064103. doi: 10.1088/1674-1137/41/6/064103

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Received: 2017-01-25
Revised: 2017-02-22

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Supported by National Natural Science Foundation of China (11375086, 11535004, 11605089, 11120101005), Natural Science Youth Fund of Jiangsu Province (BK20150762), Fundamental Research Funds for the Central Universities (30916011339), 973 National Major State Basic Research and Development Program of China (2013CB834400), and a Project Funded by the Priority Academic Programme Development of JiangSu Higher Education Institutions (PAPD)}

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沈阳化工大学材料科学与工程学院沈阳 110142

Signatures of shell evolution in alpha decay across theN=126 shell closure

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Signatures of shell evolution in alpha decay across theN=126 shell closure

Corresponding author:Yi-Bin Qian,

Corresponding author:Zhong-Zhou Ren,

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