Influence of proton-skin thickness on the α decays of heavy nuclei

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W. M. Seif and A. Abdurrahman. Influence of proton-skin thickness on the α decays of heavy nuclei[J]. Chinese Physics C, 2018, 42(1): 014106. doi: 10.1088/1674-1137/42/1/014106
W. M. Seif and A. Abdurrahman. Influence of proton-skin thickness on the α decays of heavy nuclei[J]. Chinese Physics C, 2018, 42(1): 014106.  doi: 10.1088/1674-1137/42/1/014106 shu
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Received: 2017-09-12
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Influence of proton-skin thickness on the α decays of heavy nuclei

    Corresponding author: W. M. Seif,
  • 1.  Cairo University, Faculty of Science, Department of Physics, Giza, Egypt
  • 2.  Misr University for Science and Technology(MUST), Faculty of Engineering, Department of Physics, Giza, Egypt

Abstract: We investigate the effect of proton-skin thickness on the α decay process. We consider 188 neutron-deficient nuclei belonging to the isotopic chains from Te (Z=52) to Pb (Z=82). The calculations of the half-life are carried out in the framework of the preformed cluster model, with the Wentzel-Kramers-Brillouin penetration probability and assault frequency. It is shown that the proton-skin thickness (p) of the daughter nucleus gives rise to a total α-daughter nucleus interaction potential of relatively wide deep internal pocket and a thinner Coulomb barrier of less height. This increases the penetration probability but decreases the assault frequency. The overall impact of the proton-skin thickness appears as a decrease in the decay half-life. The proton-skin thickness decreases the stability of the nucleus. The half-lives of the proton-skinned isotopes along the isotopic chain decrease exponentially with increasing the proton-skin thickness, whereas the Qα-value increases with p. α -decay manifests itself as the second favorite decay mode of neutron-deficient nuclei, next to the β+-decay and before proton-decay. It is indicated as main, competing, and minor decay mode, at 21%, 7%, and 57%, respectively, of the investigated nuclei.

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