Abstract
Preliminary differential cross sections of the reactions A(y, T O T O ) and A(y, 7 r 0 d + nor-) with A='H,12C, and natPb are presented. A significant nuclear-mass dependence of the 7rn invariant-mass distribution is found in the nono channel. The dependence is not observed in the non* channel. It is consistent with an inmedium modification of the 7 r ~ interaction in the I=J=O channel, changing width and pole position of a TT resonant state.
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