Measurement of the Gerasimov-Drell-Hearn integrand for proton and deuteron from 200 to 1400 MeV
New high-precision measurements of the helicity-dependent cross sections for protons and deuterons in the 200–1400 MeV photon energy range, obtained at the MAMI facility, have been used to verify the Gerasimov-Drell-Hearn sum rule for the proton, neutron, and deuteron while providing a critical benchmark for theoretical models of nucleon structure.