Two-and three- body breakup of $ {^3}$He at low energies

We report on measurements of the two-body breakup cross section of $^{3}$He for gamma-ray energies between 8 and 16 MeV, and of the analyzing power of the kinematically incomplete three-body breakup at 15 MeV. The monoenergetic gamma-ray beams were produced via Compton backscattering of FEL photons from high-energy electrons at the High-Intensity Gamma-ray Source at Duke University. The $^{3}$He target consisted of a high-pressure gas scintillator. The data are compared to rigorous three-nucleon calculations using realistic nucleon-nucleon and three-nucleon interactions.