Studies of nuclear fission have been ongoing since the discovery of the process in 1938 by Hahn and Strassmann [1]. The actinide nuclide Pu has long been a case of interest, as spontaneous fission presents itself as a decay mechanism with significant probability, relative to other isotopes in the actinide region. This allows for quantitative comparisons between spontaneous and induced fission [...

Fast spectrum neutron-induced fission cross sections of transuranic isotopes are being of special demand in order to provide accurate data for the new GEN-IV nuclear power plants. To minimize the uncertainties on these measurements accurate data on spontaneous fission half-lives and detector efficiencies are a key point. High -active actinides need special attention since the misinterpretation ...

The spontaneous fission lifetimes have been studied microscopically by minimizing the collective action integral in a two-dimensional collective space of quadrupole moments (Q20, Q22) representing elongation and triaxiality. The microscopic collective potential and inertia tensor are obtained by solving the self-consistent HartreeFock-Bogoliubov (HFB) equations with the Skyrme energy density fu...

Experimental data on angular distributions of γ rays emitted from binary and ternary spontaneous fission of 252 Cf are analyzed. Their difference indicates that the alignment of fragments is higher in ternary fission than in binary one. The consequences of possible relation between the mechanism of ternary fission and the excitation of collective modes during the saddle-to-scission stage are di...

Following the early discovery of two-quasiparticle, high-K isomers in Fm (Z =100) and No (Z = 102) by Ghiorso et al. [1], a number of spectroscopic studies were carried out in the Fermium region, which have different sensitivities both in terms of decay branches (e.g. decay,  decay, fission, etc.) and lifetime ranges. There has been continuing activity in addressing the complex question of w...

3 Spontaneous Fission and Neutron-Induced Fission 3 3.1 Neutron number distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2 Neutron energy distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Gamma-ray number distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.4 Gamma-ray energy distribution . . ...