First observation of two hyperfine transitions in antiprotonic He-3
arXiv:1102.5286 · doi:10.1016/j.physletb.2011.04.029
Abstract
We report on the first experimental results for microwave spectroscopy of the hyperfine structure of antiprotonic He-3. Due to the helium nuclear spin, antiprotonic He-3 has a more complex hyperfine structure than antiprotonic He-4 which has already been studied before. Thus a comparison between theoretical calculations and the experimental results will provide a more stringent test of the three-body quantum electrodynamics (QED) theory. Two out of four super-super-hyperfine (SSHF) transition lines of the (n,L)=(36,34) state were observed. The measured frequencies of the individual transitions are 11.12559(14) GHz and 11.15839(18) GHz, less than 1 MHz higher than the current theoretical values, but still within their estimated errors. Although the experimental uncertainty for the difference of these frequencies is still very large as compared to that of theory, its measured value agrees with theoretical calculations. This difference is crucial to be determined because it is proportional to the magnetic moment of the antiproton.
8 pages, 6 figures, just published (online so far) in Physics Letters B
References in corpus (4)
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Cited by in corpus (4)
- Physics at CERN's Antiproton Decelerator
- Constraints on exotic spin-dependent interactions between matter and antimatter from antiprotonic helium spectroscopy
- Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3
- Wave Packet Simulations of Antiproton Scattering on Molecular Hydrogen