Measurement of neutron multiplicity to investigate the role of entrance channel parameters on the nuclear dissipation

Abstract

In the present work, the pre- and post-scission neutron multiplicities were measured for the reaction $^{18}\mathrm{O}+^{186}\mathrm{W}$ at different excitation energies populating the compound nucleus $^{204}\mathrm{Pb}$, using the National Array of Neutron Detectors (NAND) facility at IUAC, New Delhi, India. Here, we investigated the entrance channel effect on the nuclear dissipation involved in the heavy ion fusion-fission dynamics. The statistical model analysis was performed using the code vecstat. The prescribed reaction $^{18}\mathrm{O}+^{186}\mathrm{W}$ had similar value of the mass asymmetry as the system $^{16}\mathrm{O}+^{181}\mathrm{Ta}$ studied earlier, populating the compound nucleus $^{197}\mathrm{Tl}$. Specifically, we observed the similar behavior from both the systems against the nuclear dissipation, with the similar value of the mass asymmetry. The role of the entrance channel parameters on the nuclear dissipation was also discussed in the present work.