NEUTRON EMISSION IN THE REACTION HO-165+FE-56 AT ELAB=8.5-MEV-U

Neutron emission and ±-particle emission in the Ho165 + Fe56 reaction have been measured for the damped-collision and fusion-fission components of this reaction at a bombarding energy of 8.5 MeV/u. The c.m. neutron energy spectra for damped collisions indicate equal temperatures for the light and heavy fragments, a result consistent with the equilibration of the excitation energy during the interaction time. Pre-equilibrium neutron emission is found to contribute less than 5%. An out-of-plane neutron anisotropy A2=0.2±0.1 is found. The measured ratios of the neutron multiplicities for the light and heavy fragments suggest a rapid approach of the fragment NZ ratios during the collision to that corresponding to minimum potential energy of the composite system. NUCLEAR REACTIONS Ho165(Fe56, HI xn)Elab=476 MeV; measured n(En,n,+n); deduced nuclear temperatures, neutron multiplicities, neutron-to-proton ratio NZ, neutron out-of-plane anisotropy A2. © 1979 The American Physical Society.