Microscopic description of the competition between spontaneous fission and α-decay in neutron-rich Ra, U and Pu nuclei

Frontiers in Theoretical and Applied Physics/UAE 2017

Rodríguez-Guzmán, R.^1 ; Robledo, L.M.^2

Physics Department, Kuwait University, 13060, Kuwait^1

Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid

28049, Spain^2

关键词: Fission process;    Mean-field calculations;    Microscopic description;    Microscopic study;    Nuclear systems;    Pairing correlations;    Parametrizations;    Spontaneous fission;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/869/1/012061/pdf
DOI  :  10.1088/1742-6596/869/1/012061

来源: IOP

【 摘 要 】

Constrained mean-field calculations, based on the Gogny-D1M energy density functional, have been carried out to describe fission in Ra, U and Pu nuclei with neutron number 144 ≤ N ≤ 176. Fission paths, collective masses and zero-point quantum vibrational and rotational corrections are used to compute the spontaneous fission half-lives. We also pay attention to isomeric states along the considered fission paths. Alpha decay half-lives have also been computed using a parametrization of the Viola-Seaborg formula. Though there exists a strong variance of the predicted fission rates with respect to the details involved in their computation a robust trend is obtained indicating, that with increasing neutron number fission dominates over α-decay. Our results also suggest that a dynamical treatment of pairing correlations is required within the microscopic studies of the fission process in heavy nuclear systems.