α particle preformation and shell effect for heavy andsuperheavy nuclei

  • 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.
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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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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
Fund Project:  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

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.

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