THICK-TARGET NEUTRON YIELD FOR CHARGED-PARTICLES

Measurements of the double-differential thick-target neutron yield are made for 75- and 120-MeV C-12(5+), 153-MeV O-16(5+), and 40-MeV alpha particles bombarding carbon, aluminum, copper, and lead targets. The measured data are parameterized by using the two-component moving sour ce model. The systematic variation of the equilibrium neutron (EN) yie ld with incident ions and targets is analyzed by using the thus-obtain ed moving source parameters, and a simple expression is proposed to de scribe the systematics in the EN yield. The systematic change in the n onequilibrium neutron (NEN) yield was formulated to a simple expressio n by using the local hot spot model. The proposed expression reproduce d, well the measured EN and NEN yields.