Abstract
We present preliminary results of an experiment performed at the 1-GeV electron synchrotron of the Lebedev Physical Institute. Using the bremsstrahlung photon beam with the end-point energy of 650-850 MeV and the carbon target, correlated pi+/n pairs with opening angle 180 deg and energies E_pi=300 MeV, E_n=100 MeV have been observed. They arise from the process gamma + 12C -> N + eta + (A-1) -> N + pi+ + n + (A-2) and provide evidence for the existence of eta-11B and eta-11C eta-mesic nuclei.
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