  With the improved scission-point model the mass distributions are calculated
for induced fission of different Hg isotopes with the masses 180-196. The
drastic change in the shape of the mass distribution from asymmetric to
symmetric is revealed with increasing mass number of the fissioning Hg isotope,
and the reactions are proposed to verify this prediction experimentally. The
asymmetric mass distribution of fission fragments observed in the recent
experiment on the fission of 180Hg is explained. The calculated mass
distribution and mean total kinetic energy of fission fragments are in a good
agreement with the available experimental data.
