gamma-rays are measured in coincidence with the dissipative complex fragments from the Cl-35 + Ni-64 reaction at 7.7 A MeV. Theoretical gamma-ray coincidence spectra are determined through a fitting procedure using the contribution of the excited fragment statistical gamma-decay calculated by means of the CASCADE code. Whereas the expected statistical spectra fit very well the data in the energy region E(gamma) = 2 to 8 MeV, above this energy another emission mechanism in addition to the statistical decay has to be considered in order to reproduce the experimental spectra. Simulations based on the Vlasov equation suggest that this emission could come from the decay of dipole strength excited in the intermediate dinuclear system.
PREEQUILIBRIUM GAMMA-RAY EMISSION IN DISSIPATIVE HEAVY-ION COLLISIONS
MUSUMARRA, Agatino;RIZZO, Francesca;
1995-01-01
Abstract
gamma-rays are measured in coincidence with the dissipative complex fragments from the Cl-35 + Ni-64 reaction at 7.7 A MeV. Theoretical gamma-ray coincidence spectra are determined through a fitting procedure using the contribution of the excited fragment statistical gamma-decay calculated by means of the CASCADE code. Whereas the expected statistical spectra fit very well the data in the energy region E(gamma) = 2 to 8 MeV, above this energy another emission mechanism in addition to the statistical decay has to be considered in order to reproduce the experimental spectra. Simulations based on the Vlasov equation suggest that this emission could come from the decay of dipole strength excited in the intermediate dinuclear system.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
