中国物理B ›› 2009, Vol. 18 ›› Issue (9): 3810-3814.doi: 10.1088/1674-1056/18/9/032

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α preformation and penetration probability for heavy nuclei

张高龙, 乐小云   

  1. School of Physics and Nuclear Energy Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • 收稿日期:2008-12-29 修回日期:2009-02-23 出版日期:2009-09-20 发布日期:2009-09-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60572177).

$\alpha$ preformation and penetration probability for heavy nuclei

Zhang Gao-Long(张高龙)† and Le Xiao-Yun(乐小云)   

  1. School of Physics and Nuclear Energy Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2008-12-29 Revised:2009-02-23 Online:2009-09-20 Published:2009-09-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60572177).

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摘要： The α preformation factor and penetration probability have been analyzed for even--even nuclei of Po, Rn, Ra using experimental released energies and α decay half-lives in the frame of the double folding model. It is shown that N=126 is a neutron magic number from α preformation and shell effects play an important role in α preformation. The closer the nucleon number is to the magic number, the more difficult α formation in the parent nucleus is. The preformation factor can supply information on the nuclear structure and the penetration probability mainly determines α decay half-life.

Abstract: The $\alpha$ preformation factor and penetration probability have been analyzed for even--even nuclei of Po, Rn, Ra using experimental released energies and α decay half-lives in the frame of the double folding model. It is shown that N=126 is a neutron magic number from $\alpha$ preformation and shell effects play an important role in $\alpha$ preformation. The closer the nucleon number is to the magic number, the more difficult $\alpha$ formation in the parent nucleus is. The preformation factor can supply information on the nuclear structure and the penetration probability mainly determines $\alpha$ decay half-life.

Key words: preformation factor, penetration probability, magic number

中图分类号:  (α-decay)

  • 23.60.+e
21.60.Cs (Shell model) 24.10.Ht (Optical and diffraction models) 27.80.+w (190 ≤ A ≤ 219) 27.90.+b (A ≥ 220)