The Shmushkevich method for deducing consequences of charge independence is explained and discussed. This method, which avoids entirely the use of Clebsch-Gordan coefficients, generates linear equalities and inequalities among cross sections using only a simple counting procedure. A comprehensive list of such relations, applying to most elementary-particle reactions of interest which involve at least one pair of isospin-½ particles, is presented. A discussion of the various uses of these relations is given.

• Received 7 July 1965

DOI:https://doi.org/10.1103/PhysRev.140.B1045