PHOTOEXCITATION OF THE NUCLEON IN THE CONSTITUENT QUARK-MODEL

Photoexcitation of the nucleon is studied in the framework of the cons tituent quark model with nonrelativistic quark-quark interactions. Uti lizing the dominance of the pairwise structure of the relevant three-q uark potential, the bound- and excited-state wave functions have been constructed using the Faddeev-type integrodifferential equation approa ch. The method is based on the hyperspherical harmonics expansion and takes two-body correlations exactly into account and therefore reliabl e wave functions, required in photo processes, can be obtained. The in tegrated photoabsorption cross sections for the E1 and M1 transitions are calculated and compared with experimental values as well as with t hose of other theoretical calculations. Overall, our results are in go od to very good agreement with the experimental values.