Deuteron photoabsorption sum rule: Two-body effects

In deuteron photoabsorption, the effect of mesonic exchange currents is considered in detail. Related to the electric dipole operator D1 (Siegert form) and to the nuclear interactions, a factor k appears in the integrated cross-section σ0, previously obtained by the Thomas–Reiche–Kuhn dipole sum rule. The introduction of the two-body density [Formula: see text] modifies the form of D1 and increases κ which becomes κ + Δκ. The influence of several NN potentials is clearly shown on the factor Δκ, some 25% difference occurring between a super soft core potential and the Paris potential. In this last case the value of Δκ is about 50% of the initial κ value.