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Direct Measurement of the Proton Magnetic Moment

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arxiv 1201.3038 v2 pith:NAP5UANP submitted 2012-01-14 physics.atom-ph hep-exnucl-ex

Direct Measurement of the Proton Magnetic Moment

classification physics.atom-ph hep-exnucl-ex
keywords protonmagneticmomentantiprotondirectuncertaintybeendemonstrates
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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