1973 L. J. Tassie Physics Elementary Particles xiii. 173Taking the neutron and proton as members of the SU(6) 56-plet yields the ratio of their magnetic moments as..-3/2 which is close to the experimental value of-1·46.
1975 Physics Bull. Apr. 180/3The octet of mesons is now part of a 15plet which groups together one octet and one singlet with no charm, and two triplets with charm 1 and-1, respectively.
ORIGIN: The ending of triplet , multiplet , etc.