DEEXCITATION OF HIGHLY EXCITED STATES AND GIANT RESONANCES BY NUCLEON EMISSION

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Abstract
Highly excited states and giant resonances in medium heavy nuclei were excited by inelastic scattering, and the nucleon deexcitation mechanisms were discussed in terms of non-statistical and statistical processes. The giant resonance process, the pre-equilibrium process and the knock-out (quasi-free) process were shown to be investigated separately by studying energy- and angular correlations of decaying neutrons and gamma-rays with the inelastic alphas. The giant resonances in 92Zr and 119Sn were found to decay with about 15 - 25 % probability by emitting fast (non-statistical) neutrons, and to leave one-hole states in residual nuclei. The fast neutrons are shown to carry with them crucial information on the microscopic 1p-1h configuration of the giant resonances and on the door-way configuration of the inelastic scattering

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