A STUDY OF NUCLEON PROPERTIES IN NUCLEI THROUGH (P,2P) REACTIONS

The differential cross sections and analyzing powers have been measure d for a proton knockout reaction from s(1/2) orbits of several target nuclei aiming at studying nuclear medium effects in the nucleon-nucleo n interaction, and in-medium nucleon properties through it. It is conf irmed from the cross section data that the reaction mechanism is simpl e and contribution from the multi-step processes is less than ten perc ent, only a few percent for a C-12 target case. The analyzing power sh ows a distinct reduction from the value of the free proton-proton scat tering and the target dependence, which is equivalent to the density d ependence, of the reduction suggests existence of a medium effect. The study has been extended to the measurement of other spin observables, polarization and spin-transfer coefficients, and a preliminary result is given.