Abstract
Cross sections have been measured for the $^{3}\mathrm{He}$(\ensuremath{\gamma},pp)n reaction with tagged photons in the range ${\mathit{E}}_{\ensuremath{\gamma}}$ =161--208 MeV using the Saskatchewan-Alberta Large Acceptance Detector (SALAD). The protons were detected over a range of polar angles of 40\ifmmode^\circ\else\textdegree\fi{}--140\ifmmode^\circ\else\textdegree\fi{} and azimuthal angles of 0\ifmmode^\circ\else\textdegree\fi{}--360\ifmmode^\circ\else\textdegree\fi{} with an energy threshold of 40 MeV. Comparisons are made with a microscopic calculation which includes one-, two-, and three-nucleon absorption mechanisms. One- and two-nucleon processes, including final-state interactions, are unable to account for the measured cross sections. The addition of three-nucleon absorption diagrams gives roughly the right strength, but the distribution in phase space is in disagreement with the data. \textcopyright{} 1996 The American Physical Society.
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