Effect of N/Z in pre-scission neutron multiplicity for 16,18O +194,198Pt systems

摘要: Pre-scission neutron multiplicities from fission of the compound nuclei Rn have been measured in order to investigate the dependence of fission hindrance. The Rn isotopes are populated through the fusion of O Pt systems and are formed at four excitation energies in the range of 50–79 MeV. The experimental pre-scission neutron yield is compared with predictions from the statistical model of compound nuclear decay containing the strength of nuclear dissipation as a free parameter. The strength of nuclear dissipation obtained in the present analysis does not show any specific dependence on the values of the fissioning nuclei at large excitation energies. The dissipation strength at the lowest excitation energy, however, indicates a shell closure effect at for the Rn isotope.