Quasi-real electroproduction data extrapolated to Q²=0 give σ_TT for p, n, d and ³He, with larger neutron/deuteron Δ(1232) strength than real-photon data and better isospin consistency.
Helbing, The Gerasimov-Drell-Hearn sum rule, Prog
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Extraction of $\sigma_{TT}$ for Proton, Neutron, Deuteron and $^3$He from Quasi-real Photon Scattering
Quasi-real electroproduction data extrapolated to Q²=0 give σ_TT for p, n, d and ³He, with larger neutron/deuteron Δ(1232) strength than real-photon data and better isospin consistency.