Abstract:
The influence of effective tensor forces on the fission barriers of nuclei in the uranium region has been studied. A modified Fayans energy density functional (EDF) FaNDF$^0$-a, which differs from the initial energy density functional FaNDF$^0$ in the inclusion of strong effective tensor interaction, has been proposed. For the $^{236}$U and $^{238}$U isotopes, this results in a significant, about $1$ MeV, reduction of the first barrier, approaching the values to the known experimental values. However, a noticeable, about the same order of magnitude, difference from these experimental values remains. Possible reasons for this remaining difference are discussed.