The -decay process, discovered around 1900 , is basically the decay of a neutron (n) . In the laboratory, a proton (p) and an electron (e⁻ ) are observed as the decay products of the neutron. Therefore, considering the decay of a neutron as a two-body decay process, it was predicted theoretically that the kinetic energy of the electron should be a constant. But experimentally, it was observed that the electron kineti