  The electromagnetic polarizabilities of the nucleon are fundamental
nucleon-structure observables that characterize its response to external
electromagnetic fields. The neutron polarizabilities can be accessed from
Compton-scattering data on light nuclear targets. Recent measurements of the
differential cross section for Compton scattering on the deuteron below the
pion-production threshold have decreased the uncertainties in the neutron
polarizabilities, yet the proton polarizabilities remain known substantially
more accurately. As the sensitivity of the cross section to the
polarizabilities increases with incident photon energy, measurements above the
pion threshold may offer a way for an improved determination of the neutron
polarizabilities. In this article, the first measurement of the cross section
for Compton scattering on the deuteron above the pion-production threshold is
presented.
