One-Particle Measurement of the Antiproton Magnetic Moment
Abstract
For the first time a single trapped antiproton (p¯) is used to measure the p¯ magnetic moment μp¯. The moment μp¯=μp¯S/(ℏ/2) is given in terms of its spin S and the nuclear magneton (μN) by μp¯/μN=-2.792845±0.000012. The 4.4 parts per million (ppm) uncertainty is 680 times smaller than previously realized. Comparing to the proton moment measured using the same method and trap electrodes gives μp¯/μp=-1.000000±0.000005 to 5 ppm, for a proton moment μp=μpS/(ℏ/2), consistent with the prediction of the CPT theorem.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 2013
- DOI:
- 10.1103/PhysRevLett.110.130801
- arXiv:
- arXiv:1301.6310
- Bibcode:
- 2013PhRvL.110m0801D
- Keywords:
-
- 14.20.Dh;
- 11.30.Er;
- 13.40.Em;
- 37.10.Ty;
- Protons and neutrons;
- Charge conjugation parity time reversal and other discrete symmetries;
- Electric and magnetic moments;
- Ion trapping;
- Physics - Atomic Physics
- E-Print:
- 4 pages, 4 figures. arXiv admin note: substantial text overlap with arXiv:1201.3038