The effects of nuclear isospin asymmetry on α-decay lifetimes of heavy nuclei are investigated within various phenomenological models of the nuclear potential for the α particle. We consider the widely used simple square-well potential and Woods-Saxon potential and modify them by including an isospin asymmetry term. We then suggest a model for the potential of the α particle motivated by a microscopic phenomenological approach of the Skyrme force model, which naturally introduces the isospin-dependent form of the nuclear potential for the α particle. The empirical α-decay lifetime formula of Viola and Seaborg [J. Inorg. Nucl. Chem. 28, 741 (1966)JINCAO0022-190210.1016/0022-1902(66)80412-8] is also modified to include isospin asymmetry effects. The obtained α-decay half-lives are in good agreement with the experimental data, and we find that including the nuclear isospin effects somehow improves the theoretical results for α-decay half-lives. The implications of these results are discussed, and the predictions on the α-decay lifetimes of superheavy elements are also presented.
|Journal||Physical Review C|
|Publication status||Published - 2016 Aug 12|
Bibliographical noteFunding Information:
We are grateful to N. Itagaki for fruitful discussions. This work was supported, in part, by the Basic Science Research Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Education under Grants No. NRF-2013R1A1A2A10007294, No. NRF-2014R1A1A2054096, and No. NRF-2015R1D1A1A01059603. The work of Y.L. was supported by the Rare Isotope Science Project funded by the Ministry of Science, ICT and Future Planning (MSIP) of the Korean Government and the National Research Foundation (NRF) of Korea under Grant No. 2013M7A1A1075766.
© 2016 American Physical Society.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics