Neutron emission in damped collisions

Neutron and alpha-particle emission were measured for the damped collision and fusion-fission products resulting from the bombardment of 165Ho with 8.5-MeV/u 56Fe ions. These experiments involved the measurement of neutrons and light ions coincident with Fe-like damped collision products. Neutrons were measured with NE-213 detectors. Mean neutron multiplicities and energies are tabulated. From an examination of the resultant c.m. neutron kinetic energy spectra at several angles, it is concluded that both light and heavy reaction partners exhibit equal nuclear temperatures. This result is consistent with complete equilibration of excitation energy during the lifetime of the relatively short-lived dinuclear complex formed in the interaction. The high-energy tail of these spectra leads to an estimate of < 5% for the contribution from pre-equilibrium neutron emisson. Both the total neutron multiplicity and the ratio of the heavy-to-light fragment multiplicities are shown. 2 figure, 1 table