Super-short fission mode in fermium isotopes

The so-called super-short fission mode, in which a nucleus divides nearly symmetrically into two unusually energetic fragments, competes favorably with the standard asymmetric mode for spontaneous of limited number nuclei near $^{264}\mathrm{Fm}$ but it quickly fades away at finite excitations. We investigate energy-dependent competition between those modes even fermium isotopes from $^{254}\mathrm{Fm}$ to $^{268}\mathrm{Fm}$, using Metropolis method simulate strongly damped dynamics being driven by shape- and level densities. origin is discussed its effects on fragment mass distribution, total kinetic energy, neutron multiplicity are calculated. Generally good agreement available data obtained.