The IBD reaction can only be initiated when the antineutrino possesses at least 1.806 MeV of kinetic energy (called the threshold energy). This threshold energy is due to a difference in mass between the products ( and ) and the reactants ( and ) and also slightly due to a relativistic mass effect on the antineutrino.
The IBD reaction can only be initiated when the antineutrino has at least 1.806 MeV of kinetic energy (referred to as the threshold energy). This threshold is due to variations in mass between the products and reactants, including a slight relativistic effect on the antineutrino.