&alpha; particle preformation and shell effect for heavy andsuperheavy nuclei

Yan-Wei Zhao; Shu-Qing Guo; Hong-Fei Zhang

doi:10.1088/1674-1137/42/7/074103

Chinese Physics C> 2018, Vol. 42> Issue(7) : 074103 DOI: 10.1088/1674-1137/42/7/074103

α particle preformation and shell effect for heavy andsuperheavy nuclei

1.
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
2.
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
3.
Joint Department for Nuclear Physics, Lanzhou University and Institute of Modern Physics, CAS, Lanzhou 730000, China

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Abstract：
The α particle preformation factor is extracted within a generalized liquid drop model for Z=84-92 isotopes and N=126, 128, 152, 162, 176, 184 isotones. The calculated results show clearly that the shell effects play a key role in α particle preformation. The closer the proton and neutron numbers are to the magic numbers, the more difficult the formation of the α cluster inside the mother nucleus is. The preformation factors of the isotopes reflect that N=126 is a magic number for Po, Rn, Ra, and Th isotopes, but for U isotopes the weakening of the influence of the N=126 shell closure is evident. The trend of the factors for N=126 and N=128 isotones also support this conclusion. We extend the calculations for N=152, 162, 176, 184 isotones to explore the magic numbers for heavy and superheavy nuclei, which are probably present near Z=108 to N=152, 162 isotones and Z=116 to N=176, 184 isotones. The results also show that another subshell closure may exist after Z=124 in the superheavy nuclei. This is useful for future experiments.
- particle preformation ,
- generalized liquid drop model ,
- shell effect ,
- magic number

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Yan-Wei Zhao, Shu-Qing Guo and Hong-Fei Zhang. α particle preformation and shell effect for heavy andsuperheavy nuclei[J]. Chinese Physics C, 2018, 42(7): 074103. doi: 10.1088/1674-1137/42/7/074103

Yan-Wei Zhao, Shu-Qing Guo and Hong-Fei Zhang. α particle preformation and shell effect for heavy andsuperheavy nuclei[J]. Chinese Physics C, 2018, 42(7): 074103. doi: 10.1088/1674-1137/42/7/074103 shu

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Received: 2018-02-01
Revised: 2018-04-09

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Supported by National Natural Science Foundation of China (11675066, 11475050), Fundamental Research Funds for the Central Universities (lzujbky-2017-ot04) and Feitian Scholar Project of Gansu Province

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沈阳化工大学材料科学与工程学院沈阳 110142

α particle preformation and shell effect for heavy andsuperheavy nuclei

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