Abstract
Absorption of positive pions on $^{16}\mathrm{O}$ at 65 MeV has been measured with a large solid angle detector, covering also noncoplanar kinematics. Cross sections for reactions leading to little explored final states with three or four energetic nucleons (ppp,pd, and ppd) have been determined. These processes contribute about 1/3 to the total absorption cross section. Roughly 1/10 of all charged coincidence events involves the emission of a deuteron. Evidence for backward-peaked direct deuteron emission in the pd and ppd channels has been found.
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