Abstract
The ${\mathrm{reaction}}^{3}$ He(\ensuremath{\gamma},pp)n was measured in a kinematic region which isolates the three-body absorption mechanism corresponding to the production of a pion on one nucleon, and its subsequent reabsorption on the remaining two-nucleon pair. Differential cross sections were obtained as a function of neutron recoil momentum ${\mathit{P}}_{\mathit{n}}$ at fixed neutron recoil angle ${\mathrm{\ensuremath{\theta}}}_{\mathit{n}}$=45\ifmmode^\circ\else\textdegree\fi{}, and as a function of ${\mathrm{\ensuremath{\theta}}}_{\mathit{n}}$ for fixed ${\mathit{P}}_{\mathit{n}}$=300 MeV/c. The results are quite consistent with expectations of multiple scattering calculations. Final-state interactions between outgoing nucleons plays an important role, and are predicted to be minimized in out-of-plane kinematics.
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