Role of viscosity in fusion-fission dynamics via simultaneously measured neutron and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> -particle multiplicities

The multiplicities of \ensuremath{\alpha}particles and neutrons have been measured simultaneously for the reaction ^{16}\mathrm{O}+^{196}\mathrm{Pt}forming ^{212}\mathrm{Rn}compound nucleus at excitation energies of 56 MeV, 61 MeV, and 68 MeV. Neutrons and \ensuremath{\alpha}particles were detected at various angles in coincidence with the fission fragments. To extract the contribution of pre- and postmultiplicities using the total...