Spin-Dependent Cross Sections From The Three-Body Photodisintegration Of He-3 At Incident Energies Of 12.8 And 14.7 Mev

The first measurement of the three-body photodisintegration of polarized He-3 using a circularly polarized photon beam has been performed at incident energies of 12.8 and 14.7 MeV. This measurement was carried out at the high-intensity gamma-ray source located at Triangle Universities Nuclear Laboratory. A high-pressure He-3 target, polarized via spin exchange optical pumping with alkali metals, was used in the experiment. The spin-dependent double-and single-differential cross sections from (3)(He) over right arrow((gamma) over right arrow, n) pp for laboratory angles varying from 30 degrees to 165 degrees are presented and compared with state-of-the-art three-body calculations. The data reveal the importance of including the Coulomb interaction between protons in the three-body calculations.