First measurements of spin-dependent double-differential cross sections and the gerasimov-drell-hearn integrand from 3He(γ, n)pp at incident photon energies of 12.8 and 14.7 MeV

Abstract

The first measurement of the three-body photodisintegration of longitudinally polarized 3He with a circularly polarized γ-ray beam was carried out at the High Intensity γ-ray Source facility located at Triangle Universities Nuclear Laboratory. The spin-dependent double-differential cross sections and the contributions from the three-body photodisintegration to the 3He Gerasimov-Drell-Hearn integrand are presented and compared with state-of-the-art three-body calculations at the incident photon energies of 12.8 and 14.7 MeV. The data reveal the importance of including the Coulomb interaction between protons in three-body calculations.