UMCS, Lublin

Fission barriers within the liquid drop model with the curvature term

K. Pomorski and J. Dudek

The recently revised liquid drop model (PRC 67(2003) 044316) containing the curvature term reproduces the masses of 2766 experimentally known isotopes having Z>8 and N>8 with the r.m.s. deviation equal to 0.698 MeV when the microscopic corrections of Moeller et al. was used. The influence of the congruence energy as well as the compresion term on the barrier heights is discussed within this new macroscopic model. The r.m.s. deviation of the fission barrier heights of 40 isotopes with Z > 34 is 1.73 MeV only when deformation dependent congruence energy is included. The effect of the compression term in the liquid drop energy has rather weak influence on the barrier heights.