Abstract
Preliminary differential cross-sections of the reactions A(γ, π0π0 and A(γ, π0π0 + π0π−) with A = 1H, 12C and natpb are presented. A significant nuclear-mass dependence of the ππ invariant-mass distribution is found in the π0π0 channel. The dependence is not observed in the π0π± channel. The in-medium observation in the π0π0 channel is consistent with an in-medium modification of the icy interaction in the I = J = 0 channel, changing width and pole position of a ππ resonant state.
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