Abstract
The energy and angular distributions of secondary neutrons and photons from thick carbon, iron, copper and lead targets exposed to 52 MeV protons were measured with a NE-213 scintillator and activation detectors of Al and Fe. By unfolding the measured pulse height distributions of neutrons and photons separately with the aid of response functions, the neutron and photon energy spectra at 0°, 15°, 30°, 45°, 75° emission angles were obtained for those four targets and the neutron spectra at 45° were given for thin carbon targets of various thicknesses. The angular distribution of neutron and photon fluences was obtained from the integration above 5 MeV and 2 MeV, respectively in the forward hemisphere. The experimental results for neutrons were compared with the calculated results based upon the Alsmiller's revision of the Bertini's intranuclear-cascade- evaporation model. The comparison revealed the good agreement between experiment and calculation at large emission angles but the overestimation of calculation to experiment (factor 2 ≈ 3) at small angles.
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