  The polarization of the secondary protons in the (p,2p) reaction with the S -
shell protons of nuclei 4He, 6Li, 12C, 28Si, 40Ca was measured at 1 GeV
unpolarized proton beam. The spin correlation parameters Cij for the 4He and
12C targets also were for the first time obtained as well. The polarization
measurements were performed by means of a two - arm magnetic spectrometer, each
arm of which was equipped with the multiwire proportional chamber polarimeter.
This experiment was aimed to study a modification of the proton - proton
scattering matrix in the nuclear medium.
