Measurement of the thick-target Be-9(p,n) neutron energy spectra

The thick-target neutron energy spectra of the Be-9(p,n) reaction were meas ured at several angles for proton-bombarding energies of 3.0 3.4, 3.7, 4.0 and 5.0 MeV. Time-of-flight techniques were used to determine the neutron e nergy spectra and to discriminate against background radiation. By using li thium-loaded glass scintillators and low proton pulse rate frequency, the n eutron spectra have been determined at energies as low as 70 keV The detect ors were calibrated for efficiency using the neutron spectrum of the Al(d,n ) reaction, which was accurately measured using fission chamber detectors.