Neutron emission in deep-inelastic collisions induced by 86Kr on 166Er at 5.7, 7.0, and 7.9 MeV/nucleon
Abstract
Neutron emission associated with deep-inelastic collisions of 496-, 602-, and 675-MeV 86Kr with 166Er has been studied as a function of kinetic energy loss, fragment mass, and neutron scattering angles. The major de-excitation process is neutron evaporation from fully accelerated fragments. The excitation energy is shared between the fragments in proportion to their mass, indicating energy equilibration in the intermediate dinuclear composite system for the completely damped as for the quasielastic components. Within limits imposed by the systematic uncertainties, the angular and velocity distributions of the neutrons in the laboratory frame are consistent with isotropic emission of neutrons in the c.m. frame of the fragments. We find no evidence for pre-equilibrium effects. The observed multiplicities and energy spectra of the neutrons are consistent with predictions of statistical-model calculations. NUCLEAR REACTIONS 166Er(86Kr, AL)AH Elab=496, 602, and 675 MeV; 66<=AL<=126, AH=252-AL, θ~21°-75°, -250<=Q value<=0 MeV; measured σn(Elab, Q value, θ, AL,AH,En,θn,φn) deduced neutron c.m. energy spectra, out-of-plane anisotropy and multiplicities; degree of energy equilibration.
- Publication:
-
Physical Review C
- Pub Date:
- April 1980
- DOI:
- 10.1103/PhysRevC.21.1377
- Bibcode:
- 1980PhRvC..21.1377E