IMPACT OF PP-]PP-PI-0 DATA TO NEGATIVE-PION ABSORPTION ON PROTON PAIRS

Recent data on the reaction pp ---> pppi0 close to threshold indicate unexpectedly large s-wave pion production, with a possible explanation from a heavy meson exchange contribution to the axial charge. An ampl itude with the same quantum numbers appears also in negative-pion abso rption on proton pairs in light nuclei. In this paper the effect of th is enhancement is estimated and found to be significant in the observa bles of absorption on He-3. Also some predictions are given for the qu alitative effect in pn --> (pp)s (wave)pi-.