Measurement of the antiproton magnetic moment and mass

We report a reanalysis of our p-bar x-ray data from Pb and U for fine-structure splitting and have included perturbations to the p-bar-atomic energy levels arising from radiative corrections, relativistic effects, electron screening, finite nuclear size, and nuclear recoil. The value for the antiproton magnetic moment is -2.817 +- 0.048 nuclear magnetons which is 0.1% lower than our previous result and in agreement with the CPT prediction of -2.793. In addition we have obtained a value for the p-bar mass from the measured p-bar-Pb x-ray transition energies from n = 15 to n = 10. The resulting mass 938.30 +- 0.13 MeV is in good agreement with the CPT prediction that the p-bar mass should equal the proton mass. We find m/sub p/ - m/sub p/ = -0.02 +- 0.13 MeV