Photonuclear reactions above the giant dipole resonance : A survey

Two-nucleon photoemission and nuclear correlations

“…;ons anc W, is the wavefunction of the remaining A -2 nucleons. Equations ( 11) and ( 12) are the appropriate framework for introducing final-state interactions (FSI): in fact, (11) describes the distortion induced by the residual nucleus on the emitted nucleons, while (12) describes the mutual interaction of the outgoing nucleons. In the following we shall neglect any kind of distortion: this is reasonable provided that the kinetic energy of each nucleon in the final state is sufficiently high (of the order of 100 MeV, say) so that the optical potential becomes small.…”

“…In fact, the ( y , np) process has been proposed as a main tool for the investigation of nucleon-nucleon correlations, both from the theoretical [9,10] and experimental [11] point of view. The corresponding experimental information has not been very abundant because of the low counting rates of the available source of monoenergetic photons, mainly bremsstrahlung beams (for an account of the situation see [12]). Recent high-energy measurements [13,14] with tagged photons in the range 200-400 MeV suffer from a limited energy resolution.…”