Role of nucleon-nucleon collisions in peripheral nuclear reactions near 30 MeV/A. Study of neutrons/projectile-like fragment correlations in the 20Ne + 165Ho reaction at 30 MeV/A

Correlations between projectile-like fragments (4 ≤ Z < 10) and neutrons produced in the 20Ne + 165Ho reaction at 30 MeV/A have been measured. Projectile-like fragments emitted at ± 80 were detected with two silicon detectors. Coincident neutrons were detected with 10 NE213 scintillators set between -1400 and +1400. Projectile-like fragment energy spectra and neutron velocity and multiplicity distributions were thus obtained. As a function of the charge and energy of the projectile-like fragment, neutron velocity spectra were analysed using three moving sources: a projectile-like source, a target-like source and an intermediate velocity source. Experimental results were compared with predictions of a statistical model, based on nucleon-nucleon collisions (code PERCUT), the de-excitation of primary products being treated by statistical evaporation models (codes LANCELOT and EVAP). For low linear momentum transfer collisions, experimental results are in good agreement with theoretical predictions