Fission half-lives of superheavy nuclei in a microscopic approach

A systematic study of 160 heavy and superheavy nuclei is performed in the Hartree-Fock-Bogoliubov (HFB) approach with the finite-range and density-dependent Gogny force with the D1S parameter set. We show calculations in several approximations: with axially symmetric and reflection-symmetric wave functions, with axially symmetric and non-reflection-symmetric wave functions, and finally with some representative triaxial wave functions. Relevant properties of the ground state and along the fission path are thoroughly analyzed. Fission barriers, Q α factors, and lifetimes with respect to fission and α decay as well as other observables are discussed. Larger configuration spaces and more general HFB wave functions as compared to previous studies provide a very good agreement with the experimental dataThis work partially supported by Grant No.DEC-2011/01/B/ST2/03667 from the National Science Centre (Poland) and by the Spanish Ministerio de Educación y Ciencia under Contracts No. FPA2009-13377-C02-01 and No. FPA2011-29854-C04-04 and the Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042