Abstract
In the framework of the refined resonating-group model (RRGM) observables of the photo- and electrodisintegration of 4He into p- and n-channels and those of the corresponding radiative-capture reactions in the giant-resonance energy region are calculated explicitly taking into account meson-exchange currents. The most recent experimental photo- and electrodisintegration cross sections as well as the radiative-capture analyzing powers are well described. Meson-exchange currents are found to make large contributions to the dominant E1 and the M1 transition. Large discrepancies to older calculations are explained.
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