Effective moment of inertia for several fission reaction systems induced by nucleons, light particles, and heavy ions

Abstract

Compound nucleus effective moment of inertia has been calculated for several fission reaction systems induced by nucleons, light particles, and heavy ions. Determination of this quantity for these systems is based upon the comparison between the experimental data of the fission fragment angular distributions as well as the prediction of the standard saddle-point statistical model (SSPSM). For the systems, the two cases, namely with and without neutron emission corrections were considered. In these calculations, it is assumed that all the neutrons are emitted before reaching the saddle point.It should be noted that the above method for determining of the effective moment of inertia had not been reported until now and this method is used for the first time to determine compound nucleus effective moment of inertia. Hence, our calculations are of particular importance in obtaining this quantity, and have a significant rule in the field of fission physics.Afterwards, our theoretical results have been compared with the data obtained from the rotational liquid drop model as well as the Sierk model, and satisfactory agreements were found. Finally, we have considered the effective moment of inertia of compound nuclei for the systems that formed similar compound nuclei at similar excitation energies.

Pre-saddle neutron multiplicity for fission reactions induced by heavy ions and light particles

“…A common assumption in the calculation of the angular anisotropy of fission fragments using by the transition state model is that all pre-scission neutrons are emitted prior to reaching the saddle-point, since it is not straightforward to separate experimentally the contribution of neutrons being emitted before the saddle-point and those emitted between the saddle and the scission points [26][27][28][29][30][31][32][33][34][35]. It is well known that the standard saddle-point statistical model (SSPSM) has become the standard theory of fission fragment angular distributions and received great success since it was proposed.…”