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We report new measurements of the doubly-polarized photodisintegration of$^3$He at an incident photon energy of 16.5 MeV, carried out at the HighIntensity $\gamma$-ray Source (HI$\gamma$S) facility located at TriangleUniversities Nuclear Laboratory (TUNL). The spin-dependent double-differentialcross sections and the contribution from the three--body channel to theGerasimov-Drell-Hearn (GDH) integrand were extracted and compared with thestate-of-the-art three--body calculations. The calculations, which include theCoulomb interaction and are in good agreement with the results of previousmeasurements at 12.8 and 14.7 MeV, can no longer describe the cross sectionresults at 16.5 MeV. The GDH integrand was found to be about one standarddeviation larger than the maximum value predicted by the theories.

Measurement of the Doubly-Polarized $\vec{{^3}He}(\vec{\gamma},n)pp$ Reaction at 16.5 MeV and Its Implications for the GDH Sum Rule