Short-Range Correlations and Meson Exchange Currents in Photonucleon Emission |
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Authors: | M. Anguiano G. Co' A.M. LallenaS.R. Mokhtar |
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Affiliation: | a Dipartimento di Fisica, Università di Lecce, Lecce, I-73100, Italyb I.N.F.N. sez. di Lecce, Lecce, I-73100, Italyc Departamento de F?́sica Moderna, Universidad de Granada, Granada, E-18071, Spaind Department of Physics, University of Assiut, Assiut, Egypt |
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Abstract: | One-nucleon emission processes induced by photon absorption are studied by considering short-range correlation effects. At energies above the giant resonance region the validity of the direct knock-out model has been tested by comparison with continuum random phase approximation results. Nucleon re-scattering effects have been considered by using an optical potential. The role of the electromagnetic convection, magnetization, and meson exchange currents has been investigated as a function of both excitation energy and momentum transfer. The short-range correlation effects have been studied by using various correlation functions. We found that the nucleon photo-emission cross section is rather sensitive to the presence of short-range correlations at large values of nucleon emission angle. In this region, however, the effects of meson exchange currents are even larger than those produced by short-range correlations. |
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