Compton scattering from the deuteron and extracted neutron polarizabilities

Differential cross sections for Compton scattering from the deuteron were measured at MAX-Lab for incident photon energies of 55 and 66 MeV at nominal laboratory angles of 45 deg., 125 deg., and 135 deg. Tagged photons were scattered from liquid deuterium and detected in three NaI spectrometers. By comparing the data with theoretical calculations in the framework of a one-boson-exchange potential model, the sum and the difference of the isospin-averaged nucleon polarizabilities, αN+βN=17.4±3.7 and αN-βN=6.4±2.4 (in units of 10-4 fm3), have been determined. By combining the latter with the global-averaged value for αp-βp and using the predictions of the Baldin sum rule for the sum of the nucleon polarizabilities, we have obtained values for the neutron electric and magnetic polarizabilities of αn=8.8±2.4(total)±3.0(model) and βn=6.5±2.4(total)±3.0(model), respectively