Abstract
A dispersion relation analysis of the existing photonuclear data from proton and deuterium to uranium is performed. It is found that the real part of the nuclear forward Compton amplitude in the region of the Δ (1232) resonance has its zero at a universal energy ω0≃327±5 MeV throughout the periodic table. This fact can be used to arrive at a representation of the Gell-Mann, Goldberger and Thirring sum rule.
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