what is beta decay
In nuclear physics, beta decay (Î² -decay) is a type of radioactive decay in which a proton is transformed into a neutron, or vice versa, inside an atomic nucleus.This process allows the atom to move closer to the optimal ratio of protons and neutrons. Fermi transition is a beta decay in which the spins of the emitted electron (positron) and anti-neutrino (neutrino) couple to total spin, leading to an angular momentum change between the initial and final states of the nucleus (assuming an allowed transition).