%0 Journal Article %T Direct Measurement of the Proton Magnetic Moment %A J. DiSciacca %A G. Gabrielse %J Physics %D 2012 %I arXiv %R 10.1103/PhysRevLett.108.153001 %X The proton magnetic moment in nuclear magnetons is measured to be $\mu_p/\mu_N \equiv g/2 = 2.792\,846 \pm 0.000\,007$, a 2.5 ppm (parts per million) uncertainty. The direct determination, using a single proton in a Penning trap, demonstrates the first method that should work as well with an antiproton as with a proton. This opens the way to measuring the antiproton magnetic moment (whose uncertainty has essentially not been reduced for 20 years) at least $10^3$ times more precisely. %U http://arxiv.org/abs/1201.3038v2