POLARIZATION DEGREES OF FREEDOM IN PHOTOINDUCED 2-NUCLEON KNOCKOUT FROM FINITE NUCLEI

The polarization degrees of freedom in photoinduced two-nucleon knocko ut from finite nuclei are studied. It is pointed out that they open go od perspectives to study the dynamics of dinucleons in the medium in d etail. The (gamma,pp) and (gamma,pn) angular cross sections, photon as ymmetries, and outgoing nucleon polarizations are calculated for the t arget nuclei O-16 and C-12 and photon energies ranging from 100 up to 500 MeV. It is investigated to which degree the two-nucleon emission r eaction is dominated by photoabsorption on S-3(1)(T=0) proton-neutron and S-1(0)(T=1) proton-proton pairs in the nuclear medium. The calcula tions demonstrate that dominance of S-wave photoabsorption in the (gam ma,pn) channel does not necessarily imply that the reaction mechanism is similar to what is observed in deuteron photodisintegration.