Dynamical effects in the pre-scission neutron emission from 160Yb at Ex∼75 MeV

Abstract Neutron spectra in coincidence with fission fragments have been measured for the 115 MeV 16 O + 144 Sm and 270 MeV 60 Ni + 100 Mo reactions, populating 160 Yb compound nucleus at E x ∼75 MeV excitations energy. The extracted pre-scission multiplicity for the 60 Ni + 100 Mo reaction is substantially larger than the statistical model prediction, demonstrating clearly that dynamical effects dominate even at low excitation energy.