  Fission neutron multiplicity distributions are known to be well reproduced by
simple Gaussian distributions. Many previous evaluations of multiplicity
distributions have adjusted the widths of Gaussian distributions to best fit
the measured multiplicity distributions Pn. However, many observables do not
depend on the detailed shape of Pn, but depend on the first three factorial
moments of the distributions. In the present evaluation, the widths of
Gaussians are adjusted to fit the measured 2nd and 3rd factorial moments. The
relationships between the first three factorial moments are estimated assuming
that the widths of the multiplicity distributions are independent of the
initial excitation energy of the fissioning system. These simple calculations
are in good agreement with experimental neutron induced fission data up to an
incoming neutron energy of 10 MeV.
