2 The Two-Nucleon System
The study of the hydrogen atom is relatively simple due the fact that the Coulomb force between the proton and the electron is very well known. The solution of this quantum problem resulted in the determination of a group of states of energy allowed for the system, permitting direct comparison with the measured values of the electromagnetic transitions between those states. Ever since, there has been great progress in understanding the hydrogen atom and atoms with many electrons. Nowadays, there are only small discrepancies between quantum theory and experimental data.
Nuclear systems are much more complex than atomic ones. Already the simplest case, the system of two nucleons, has its theoretical treatment ...