Mechanism of reduction of (static) fission-barrier height Bstf by non-axial deformations is studied for the nucleus 250Cf. Two-dimensional (quadrupole) deformation space is used. It is found that the reduction is the effect of a rather strong change of shell structure with a change of deformation of the nucleus.
PACS numbers: 25.85.Ge, 27.90.+b
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