Neutrons in coincidence with intermediate mass fragments at large angles from 14N+Ag reactions at EA = 20 and 35 MeV

The spectral shape and multiplicity of neutrons from the reaction of 14N+Ag at EA = 20 and 35 MeV have been measured for neutrons in coincidence with intermediate mass nuclei emitted at 500, 700, and 900. The spectral shape clearly suggests two moving sources. The slower source velocity is about 80% of the center-of-mass velocity for EA = 20 MeV and 65% of the center-of-mass velocity for EA = 35 MeV (9% and 7% of the beam velocity, respectively). The faster source velocity is slightly less than half of the beam velocity for each case. Knowledge of the neutron multiplicity is necessary for models which attempt to explain the low effective temperature which has been determined from recent measurements of excited state populations. The data are also compared to the Boltzmann master equation approach of Harp, Miller, and Berne