NN final-state interaction in two-nucleon knockout from 16 O
Dipartimento di Fisica Nucleare e Teorica dell’Universitá degli Studi di Pavia, I-27100, Pavia, Italy
2 Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099, Mainz, Germany
3 Dipartimento di Fisica Nucleare e Teorica dell’Universitá degli Studi di Pavia, I-27100, Pavia, Italy
4 Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, I-27100, Pavia, Italy
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The influence of the mutual interaction between the two outgoing nucleons (NN-FSI) in electro- and photoinduced two-nucleon knockout from 16 O has been investigated perturbatively. It turns out that the effect of NN-FSI depends on the kinematics and on the type of reaction considered. The effect is generally larger in pp- than in pn-knockout and in electroinduced than in photoinduced reactions. In superparallel kinematics NN-FSI leads in the (e,e‘pp) channel to a strong increase of the cross-section, that is mainly due to a strong enhancement of the -current contribution. In pn-emission, however, this effect is partially cancelled by a destructive interference with the seagull current. For photoreactions NN-FSI is considerably reduced in superparallel kinematics and can be practically negligible in specific kinematics.
© Società Italiana di Fisica and Springer-Verlag, 2004