Since the final state is known to have an energy Qα=4.3MeV, we will take this energy to be as well the initial energy of the two particles in the potential well (we assume tha...Since the final state is known to have an energy Qα=4.3MeV, we will take this energy to be as well the initial energy of the two particles in the potential well (we assume that Qα=E since Q is the kinetic energy while the potential energy is zero).