isospin multiplet
英[ˈaisəˌspin ˈmʌltiplet]美[ˈaɪsəˌspɪn ˈmʌltəˌplɛt]
In particle physics, isospin multiplets are families of hadrons with approximately equal masses. All particles within a multiplet, have the same spin, parity, and baryon numbers, but differ in electric charges.