Eur. Phys. J. A (2009) 42: 605-608
https://doi.org/10.1140/epja/i2009-10829-y

Regular Article - Theoretical Physics

Microscopic analysis of the fission barriers in ²⁵⁶Fm and ²⁵⁸Fm

¹ Katedra Fizyki Teoretycznej, Uniwersytet Marii Curie-Skłodowskiej, ul. Radziszewskiego 10, 20-031, Lublin, Poland
² Departament d’Estructura i Constituents de la Matèria and Institut de Ciències del Cosmos, Facultat de Física, Universitat de Barcelona, Diagonal 647, 08028, Barcelona, Spain

^* e-mail: warda@kft.umcs.lublin.pl

Received: 31 December 2008
Revised: 16 April 2009
Accepted: 13 May 2009
Published online: 17 June 2009

Abstract

The fission barriers of ²⁵⁶Fm and ²⁵⁸Fm have been analyzed in the HFB theory. The potential energy and the effective inertia parameter have been calculated in the two-dimensional deformation space of quadrupole and octupole moments. Fission paths for various octupole moments of the exit point from the fission barrier have been determined. The half-life along each path has been calculated. The shortest half-lives have been obtained for the paths with reflection symmetric shapes of nuclei in both the considered isotopes.