Polarization effects in the quasi - elastic (p,2p) reaction with the nuclear S - shell protons at 1 GeV

TL;DR

This study measures the polarization of secondary protons in (p,2p) reactions with various nuclei at 1 GeV to investigate modifications in proton-proton scattering within the nuclear medium.

Contribution

It provides new polarization data for S-shell protons and first measurements of spin correlation parameters Cij for 4He and 12C at 1 GeV.

Findings

Polarization of secondary protons was successfully measured across multiple nuclei.

First-time measurement of spin correlation parameters Cij for 4He and 12C.

Results suggest modifications in the proton-proton scattering matrix in nuclear matter.

Abstract

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.