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VOLUME 30 (1979) | ISSUE 1 | PAGE 22
Ground state energy shift in the proton-antiproton atom
We have obtained limits on the isosinglet and isotriplet scattering lengths for NN based on energy shift data for the ground state of the proton-antiproton atom. A technique is indicated for finding the nuclear level binding energy in the NN system based on the shift of the atomic IS state and one of the NN scattering lengths.