Abstract
The distribution function of the reacting particles' center of gravity isderived in order to determine the energy distribution of particles produced by fusion reaction. It is shown that the distribution function of the reacting particles' center of gravity becomes a Maxwellian distribution regardless of energy dependence of the reaction cross section when two Maxwellian distributions of fuel particles interact. The 14.7 MeV protons produced by D³He reaction have an energy spread of about 2 MeV due to the thermal motion of the center of gravity. About 90 % of the kinetic energy of the fusion protons can be converted into electricity if a one-stagedirect-current direct energy converter is used to recover the protons' kinetic energy.
