THICK TARGET NEUTRON YIELDS AND NEUTRON SPECTRA PRODUCED BY 20-MEV HELIUM-3 IONS 14-MEV PROTONS AND 7.5-MEV DEUTERONS ON A BERYLLIUM TARGET

Fast neutrons were produced in a beryllium target by 20 MeV 3He ions, 14 MeV protons and 7·5 MeV deuterons. The energy spectrum was measured by means of nuclear reactions with different thresholds, and yielded average fast neutron energies of respectively 7·8, 2·0 and 2·5 MeV. The measured angular distributions were used for determining the absolute neutron yields, being respectively 1·3×109, 6×1010 and 1·4×1010 neutrons/sec. 4π.μA. The advantages and disadvantages of fast neutrons of this type as compared with those from traditional 14 MeV neutron generators are pointed out. © 1969.