| Improved empirical formula for α particle preformation factor |
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| 引用本文： | 何燕,余璇,张鸿飞.Improved empirical formula for α particle preformation factor[J].中国物理C（英文版）,2021(1). |
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| 作者姓名： | 何燕 余璇 张鸿飞 |
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| 作者单位： | School of Nuclear Science and Technology;Joint Department for Nuclear Physics;Engineering Research Center for Neutron Application |
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| 基金项目： | Supported by the National Natural Science Foundation of China (11675066, 11665019, 11947229);Fundamental Research Funds for the Central Universities(lzujbky-2017-ot04);Feitian Scholar Project of Gansu province。 |
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| 摘 要： | In this contribution,the α preformation factors of 606 nuclei are extracted within the framework of the generalized liquid drop model(GLDM).Through the systematic analysis of the α preformation factors of even-even Po-U isotopes,we found that there is a significant weakening of influence of N=126 shell closure in uranium,which is consistent with the results of a recent experiment J.Khuyagbaatar et al.,Phys.Rev.Lett.115,242502(2015)],implying that N=126 may not be the magic number for U isotopes.Furthermore,we propose an improved formula with only 7 parameters to calculate α preformation factors suitable for all types of α-decay;it has fewer parameters than the original formula proposed by Zhang et al.H.F.Zhang et al.,Phys.Rev.C 80,057301(2009)]with higher precision.The standard deviation of the α preformation factors calculated by our formula with extracted values for all 606 nuclei is 0.365 with a factor of 2.3,indicating that our improved formula can accurately reproduce the α preformation factors.Encouraged by this,the α-decay half-lives of actinide elements are predicted,which could be useful in future experiments.Notably,the predicted α-decay half-lives of two new isotopes 220 Np Z.Y.Zhang,et al.,Phys.Rev.Lett.122,192503(2019)] and 219 Np H.B.Yang et al.,Phys.Lett.B 777,212(2018)] are in good agreement with the experimental α-decay half-lives.
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| 关 键 词： | a decay preformation factor generalized liquid drop model |
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