Influence of proton-skin thickness on the α decays of heavy nuclei. (January 2018)

• Record Type: Journal Article
• Authors: Seif, W M; Abdurrahman, A
• Is Part Of: Chinese physics C. Volume 42:Number 1(2018:Jan.)
• Publication Date: 2018-01
• Subjects: alpha decay -- half-life -- proton-skin thickness -- branching ratio; 23.60.+e -- 27.60.+j -- 27.70.+q; Particles (Nuclear physics) -- Periodicals; Nuclear physics -- Periodicals; 539.76
• DOI: 10.1088/1674-1137/42/1/014106
• Languages: English
• ISSNs: 1674-1137

Abstract

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 ( Δ 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 Q α -value increases with Δ 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.