CHARMONIUM SPECTROSCOPY FROM INCLUSIVE $’ AND J/$ RADIATIVE DECAYS*

Results from a detailed study using the Crystal Ball detector at the SLAC e/sup +/e/sup -/ storage ring SPEAR of the inclusive photon spectra from 1.8 x 10/sup 6/ psi' and 2.2 x 10/sup 6/ J/psi decays are presented. Radiative transitions from the psi' to the chi/sub 2,1,0/ states are observed with photon energies of 126.0 +- 0.2 +- 4, 169.6 +- 0.3 +- 4, and 258.4 +- 0.4 +- 4 MeV and branching ratios B(psi'..--> gamma..chi/sub 2,1,0/) = (8.0 +- 0.5 +- 0.7)%, (9.0 +- 0.5 +- 0.7)%, and (9.9 +- 0.5 +- 0.8)%, respectively. Values for the natural linewidths of the chi states are obtained: GAMMA(chi/sub 2,1,0/) = 0.8--4.9, gamma..eta/sub c-italic/) = (0.28 +- 0.06)% and B-italic(J/psi..--> gamma..eta/sub c-italic/) = (1.27 +- 0.36)%, and for the natural width GAMMA(eta/sub c-italic/) = 11.5 +- 4.5 MeV.