  We describe the fissioning dynamics of Pu240 from a configuration in the
proximity of the outer fission barrier to full scission and the formation of
the fragments within an implementation of density functional theory extended to
superfluid systems and real-time dynamics. The fission fragments emerge with
properties similar to those determined experimentally, while the fission
dynamics appears to be quite complex, with many excited shape and pairing
modes. The evolution is found to be much slower than previously expected, and
the ultimate role of the collective inertia is found to be negligible in this
fully nonadiabatic treatment of nuclear dynamics, where all collective degrees
of freedom (CDOF) are included (unlike adiabatic treatments with a small number
of CDOF).
