Monday, 9 September 2019

nuclear physics - Why doesn't the deuterium nucleus have spin 0?


A deuterium nucleus is composed of a proton and a neutron. Both have spin 1/2 so I would expect the deuterium to have two possible spins: 1 for the triplet and 0 for the singlet. But apparently deuterium always has spin 1 and the spin 0 state doesn't exist. Why?




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