IS THERE A PRONOUNCED GIANT-DIPOLE RESONANCE IN HE-4

A four-nucleon calculation of the total He-4 photodisintegration cross section is performed. The full final-state interaction is taken into account for the first time. This is achieved via the method of the Lor entz integral transform. Semirealistic NN interactions are employed. D ifferent from the known partial two-body He-4(gamma, n)He-3 and He-4(g amma, p)H-3 cross sections our total cross section exhibits a pronounc ed giant resonance. Thus, in contrast to older (gamma, np) data, we pr edict quite a strong contribution of the (gamma, np) channel at the gi ant resonance peak energy.