Fission time-scale from the measurement of pre-scission light particles and γ-ray multiplicities

An overview of the experimental result on simultaneous measurement of pre-scission neutron, proton, α -particle and GDR γ -ray multiplicities for the reaction 28 Si + 175 Lu at 159 MeV using the BARC–TIFR Pelletron–LINAC accelerator facility is given. The data were analysed using deformation-dependent particle transmission coefficients, binding energies and level densities which are incorporated in the code JOANNE2 to extract fission time-scales and mean deformation of the saddle-to-scission emitter. The neutron, light charged particle and GDR γ -ray multiplicity data could be explained consistently. The emission of neutrons seems to be favoured towards larger deformation as compared to charged particles. The pre-saddle time-scale is deduced as (0–2) × 10 −21 s whereas the saddle-to-scission time-scale is (36–39) × 10 −21 s. The total fission time-scale is deduced as (36–41) × 10 −21 s.