Abstract
The production of neutral pions has been studied in reactions of 35 MeV/nucleon /sup 14/N+ /sup 27/Al,Ni,W and 25 MeV/nucleon /sup 16/O+ /sup 27/Al,Ni. Inclusive pion differential distributions dsigma/dT/sub ..pi../, dsigma/d..cap omega.., dsigma/dy, dsigma/dp/sub perpendicular/, and d/sup 2/sigma/dy dp/sub perpendicular/ have been measured by detecting the two pion-decay ..gamma.. rays in a setup of 20 lead glass Cerenkov detector telescopes. Special care was taken to understand and suppress background events. Effects of pion reabsorption are discussed and it is found that the cross sections presented here are substantially affected by such final state interactions. The comparatively large experimental cross sections and the shape of the spectral distributions cannot be accounted for in single nucleon-nucleon collision or statistical models; they rather call for a coherent pion production mechanism.
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