Double Pion Photoproduction off (7)Li

Data for quasi-free photoproduction of pi(0)pi(0) and pi(0)pi(+/-) pairs from (7)Li have been analyzed in view of the in-medium properties of hadrons. Data have been measured with the CB/TAPS detector setup using the Glasgow photon tagging spectrometer for incident photon energies upto 820 MeV. The double pi(0) invariant mass distributions show an enhancement with respect to the mixed charged channel at small invariant masses. This enhancement could be consistent with an in-medium modification of the pi pi interaction in the I = J = 0 channel, however effects from final state interactions must also be considered.

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