Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2018 Impact factor 0.961

Nuclear Science and Techniques ›› 2015, Vol. 26 ›› Issue (2): S20510 doi: 10.13538/j.1001-8042/nst.26.S20510

Special Issue: Special Section on International Workshop on Nuclear Dynamics in Heavy-Ion Reaction (IWND2014)

• Special Section on International Workshop on Nuclear Dynamics in Heavy-Ion Reaction (IWND2014) • Previous Articles     Next Articles

Half-lives of double β- -decay with two neutrinos

REN Yue-Jiao (任月皎)1 and REN Zhong-Zhou (任中洲)1, 2   

  1. 1Department of Physics, Nanjing University, Nanjing 210093, China
    2Center of Theoretical Nuclear Physics,National Laboratory of Heavy-Ion Accelerator, Lanzhou 730000, China
  • Contact: REN Zhong-Zhou E-mail:zren@nju.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China
    (Nos. 11035001, 10975072, 11120101005 and 11375086), the Research
    Fund of Doctoral Point (RFDP) (No. 20070284016) and the Priority Academic
    Program Development of Jiangsu Higher Education Institutions

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REN Yue-Jiao, and REN Zhong-Zhou . Half-lives of double β- -decay with two neutrinos.Nuclear Science and Techniques, 2015, 26(2): S20510     doi: 10.13538/j.1001-8042/nst.26.S20510

Abstract:

Nuclear double β-decay with two neutrinos is an important decay mode for some unstable nuclei. Based
on the available experimental data of nuclear double β-decay, we propose that there is a law between the
logarithm of double β-decay half-lives and the reciprocal of the decay energy. The physics behind the law is
discussed and it is found that this is associated with the universal properties of the weak interaction. This double
β-decay law is similar to the famous Geiger-Nuttall law of -decay. The law is applied to predictions of the
nuclear double β-decay half-lives for six even-even nuclei from Z = 84 to Z = 98 and we found that 232Th
is very interesting for future experiments. The branching ratios between double β-decay and -decay are also
estimated for the six even-even nuclei and this is useful for future experimental search of new emitters of double
β-decay.

Key words: Double β-decay with two neutrinos, Systematic law, Half-lives of heavy nuclei, The nucleus 232Th