Editing Nuclear physics (section)

===Studies of nuclear spin===
The Rutherford model worked quite well until studies of [[Spin (physics)|nuclear spin]] were carried out by [[Franco Rasetti]] at the [[California Institute of Technology]] in 1929. By 1925 it was known that protons and electrons each had a spin of {{frac|±|1|2}}. In the Rutherford model of nitrogen-14, 20 of the total 21 nuclear particles should have paired up to cancel each other's spin, and the final odd particle should have left the nucleus with a net spin of {{frac|1|2}}. Rasetti discovered, however, that nitrogen-14 had a spin of 1.