Compton scattering from $^4$He at 61 MeV

Compton scattering, where the electromagnetic field of a real photon induces radiation multipoles by displacing charges and currents inside the nucleon, is an important probe of both the structure of light nuclei and the nucleon polarizabilities. This paper presents the first extensive and precise measurements of elastic Compton scattering on ${}^{4}$He. These results should allow precision comparisons with new calculations expected from both lattice gauge and effective field theories.