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Showing 1 to 1 of 1 for “"double arm spectrometer"”.
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Search for the eta c
… p -> X n, X -> gamma gamma at 13 Gev. We used a double arm spectrometer with lead glass and scintillation elements. No resonances were observed above mass 2.8 in the gamma gamma spectrum. The upper limit for the eta c cross section tines branching ratio is 23 pb.