Measurement of recoil-proton polarization in. pi. /sup 0/-meson photoproduction at an angle theta(0 = 60/sup 0/ in the resonance region

We report measurements of the energy dependence of the P/sub y/ component of the recoil-proton polarization vector in the reaction ..gamma..p..-->..p..pi../sup 0/ for a pion-production angle theta(0 = 60/sup 0/ in the region of ..gamma..-ray energies E/sub ..gamma../ = 0.8--1.5 GeV. The results of the measurements are compared with the predictions of various theoretical analyses.