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Deuterium , however , benefits from having its proton and neutron coupled to a spin-1 state , which gives a stronger nuclear attraction ; the corresponding spin-1 state does not exist in the two-neutron or two-proton system , due to the Pauli exclusion principle which would require one or the other identical particle with the same spin to have some other different quantum number , such as orbital angular momentum .
 person: Pauli
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Pauli