  We have, recently, shown that the general trends of partition-wise fission
fragment mass distribution in heavy ion (HI) induced compound nuclear (CN)
fission of heavy nuclei can be reproduced reasonably well by using the concept
of isospin conservation, hence providing a direct evidence of isospin
conservation in neutron-rich systems [1, 2, 3, 4]. In this paper, we test the
concept of isospin conservation to reproduce the fission fragment mass
distribution emerging from thermal neutron-induced CN fission reaction,
245Cm(nth, f). As earlier, we use Kelson's conjectures [5] to assign isospin to
neutron-rich fragments emitted in fission, which suggest the formation of
fission fragments in Isobaric Analog states (IAS). We calculate the relative
yields of neutron-rich fragments using the concept of isospin conservation and
basic isospin algebra. The calculated results reproduce quite well the
experimentally known partition wise mass distributions. This highlights the
usefulness of isospin as an approximately good quantum number in neutron-rich
nuclei. This also allows us to predict the fragment distribution of the most
symmetric Cd-Cd partition and the heavier mass fragment distributions, both not
measured so far.
