The name magic number comes from the shell model of the nucleus. The combined quantum mechanical effects of protons and neutrons in the nucleus can create energy shells similar to the electron energy levels found in atoms. The number of protons or neutrons required to fill each shell is called a magic number. The GANIL team detected two nickel-48 nuclei among the debris of collisions between a beam of nickel-58 ions and a target containing various nickel isotopes.