Is there a Pronounced Giant Dipole Resonance in 4He?
V. D. Efros, W. Leidemann, G. Orlandini
Abstract
A four-nucleon calculation of the total 4He 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 Lorentz integral transform. Semi-realistic NN interactions are employed. Different from the known partial two-body 4He(γ,n)3He and 4He(γ,p)3H cross sections our total cross section exhibits a pronounced giant resonance. Thus, in contrast to older (γ,np) data, we predict quite a strong contribution of the (γ,np) channel at the giant resonance peak energy.
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