The response function of organic scintillator NE213 to 59.5 MeV neutrons

The response function of a 12.7 cm diameter × 12.7 cm cell of an organic liquid scintillator NE213 has been studied at En = 59.5 MeV. In the pulse shape spectra bands due to deuterons, besides protons and alpha particles produced by neutron interactions are identified. In order to discriminate the contribution from the 12C (n, np) reaction, a coincidence experiment between the protons in the scintillator and the escaping neutrons from the scintillator was made. To confirm the deuteron band further, a liquid scintillator cell was directly bombarded by a faint deuteron beam with an energy of 56 MeV. The response functions for individual bands are very different from the calculated response using the Monte Carlo method.