CREATION OF $pi$-MESONS ON ZERO ISOTOPIC SPIN NUCLEI

The energy spectra and differential cross sections for the production of pi /sup +/ and pi /sup -/ mesons on deuterium and of pi /sup mesons on carbon were measured for a proton energy of 660 Mev and an observation angle of 45 deg with respect to the beam. Comparison of the data on production of charged and neutral mesons confirms the correcthess for deuterium and carbon of the relation d sigma /sup +/ + d sigma /sup -/= 2d sigma /sup o/ which follows from the hypothesis of an isotopic invariance for zero isotopic spin nuclei. (auth)