Abstract
In the present work we have measured pre- and post-scission neutron multiplicities $({M}_{\mathrm{pre}}$ and ${M}_{\mathrm{post}})$ from two compound nuclei, namely $^{192,202}\mathrm{Po}$ populated by $^{48}\mathrm{Ti}+^{144,154}\mathrm{Sm}$ systems at 72 MeV of excitation energy using the National Array of Neutron Detectors (NAND) facility at IUAC, New Delhi. Statistical model analysis has been performed for $^{48}\mathrm{Ti}+^{144,154}\mathrm{Sm}$ along with already existing data for $^{12}\mathrm{C}+^{194}\mathrm{Pt}$ and $^{18}\mathrm{O}+^{192}\mathrm{Os}$ covering compound nuclei of Po $(^{192,202,206,210}\mathrm{Po})$ with neutron number ${N}_{C}=108$, 118, 122, and 126 respectively. Variation of experimental ${M}_{\mathrm{pre}}$ with $N/Z$ of the compound nucleus does not show any special feature at neutron shell closure $({N}_{C}=126)$ at compound nucleus excitation energy around 72 MeV considered here. In particular, it is found that dissipation alone is unable to reproduce the experimental ${M}_{\mathrm{pre}}$ for $^{192}\mathrm{Po}$, and the role of entrance channel dynamics should be considered in future works.
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