The pre- and postscission neutron multiplicities have been determined for the fission of the compound nucleus (CN) ${}^{206}\mathrm{Rn}$, induced by the reaction ${}^{28}\mathrm{Si}+{}^{178}\mathrm{Hf}$ within the excitation energy interval of 61.0–90.0 MeV. We intentionally formed the CN ${}^{206}\mathrm{Rn}$, which is below the shell closure CN, to examine the variation in N/Z with total neutron multiplicity, as data for other compound nuclei of ${}^{208,210,212,214,216}\mathrm{Rn}$ have already been published in the literature. The present experimental investigations between N/Z and total multiplicities validate the theoretical claims made by various calculations. Specifically, it was observed that the total neutron multiplicity decreases as the compound nucleus approaches the shell closure and subsequently increases as it moves away from the shell closure. Furthermore, we have observed that, below the neutron shell closure, the dissipation in compound nuclei escalates with rising excitation energy, remains stable at the shell closure CN, and thereafter diminishes with increasing excitation energy above the shell closure CN.

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• Heavy-ion reaction mechanisms
• Nuclear reactions