Abstract
Abstract The gamma-ray multiplicity associated with the emission of high-energy gamma rays and neutrons following 12 C+ 159 Tb reactions at E lab = 100 MeV has been measured. The spin decrease deduced for coincident gamma rays within the GDR energy region is found to be in agreement with an estimate based on a statistical model. Neutron spectra measured in coincidence with high-energy gamma rays are explained in terms of two components. The cooler component corresponds to neutrons evaporated from the compound nucleus. The hotter component emanates from a precompound source moving in the center-of-mass system along the beam direction. The multiplicity of gamma-ray cascades, coincident with neutrons from the two different sources, has been deduced. The results show that beside the GDR there appears to be a second source of gamma rays with E γ ≈10MeV. These gamma rays are emitted in more peripheral reactions and before neutron evaporation.
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