Köln 2004 – wissenschaftliches Programm
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PV: Plenarvorträge
PV IV
PV IV: Plenarvortrag
Montag, 8. März 2004, 14:45–15:15, P
Nucleon knockout reactions on 3He induced by virtual photons — •E. Jans — NIKHEF, Amsterdam
Nucleon knockout reactions induced by virtual photons reveal information about the ground state wave function of the nucleus under study. Predictions from theoretical models that account for final state interactions (FSI), meson exchange currents (MEC) and isobar currents (IC) are needed to interpret the data. Exclusive (e,e′p) cross sections measured in the quasi-elastic scattering region are sensitive to the momentum distribution of the proton in the initial state. With semi-exclusive (e,e′p) experiments performed in the dip region, i.e., the energy-transfer region between the peaks corresponding to quasi-elastic scattering and Δ-excitation, the knockout of correlated nucleon pairs can be investigated. Two-nucleon knockout reactions became feasible with the completion of high duty-factor electron facilities like AmPS (Amsterdam), MAMI (Mainz) and JLab (Newport News, USA). Comparison of results from (e,e′pp) and (e,e′pn) is needed to disentangle the interplay between contributions from correlations in the initial state wave function generated by the NN-interaction, MEC, IC and FSI. Various results of nucleon knockout experiments on 3He will be presented and compared to predictions from state-of-the-art theoretical models like continuum Faddeev calculations, which employ realistic NN-interactions. The dependence of the 3He(e,e′pN) cross sections on the missing momentum and on the characteristics of the virtual photon will be discussed.