Compton scattering from He-4 at the TUNL HI gamma S facility

摘要

Differential cross sections for elastic Compton scattering from He-4 have been measured with high statistical precision at the High Intensity gamma-ray Source at laboratory scattering angles of 55 degrees, 90 degrees, and 125 degrees using a quasi-monoenergetic photon beam with a weighted mean energy value of 81.3 MeV. The results are compared to previous measurements and similar fore-aft asymmetry in the angular distribution of the differential cross sections is observed. This experimental work is expected to strongly motivate the development of effective-field-theory calculations of Compton scattering from He-4 to fully interpret the data.