2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191078The Baldin sum rule for the nucleon has been recalculated at the light of the most recent photoabsorption cross section measurements. The proton value (alpha + beta)_p =13.69 +/- 0.14 is smaller but consistent with the one usually quoted in literature. However, the value for the neutron (alpha + β)_n =14.40 +/- 0.66 turns out to be three standard deviations away from the previously calculated one.6 pages, LaTex2e, 2 figures, 2 tables. Phys. Rev. C to appearNuclear Theorytext