Preliminary results from recent measurements of the antiprotonic helium hyperfine structure

Pask, T.

doi:10.1007/s10751-009-0023-8

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…The measured hyperfine transition frequencies agree with theory [12] within less than 1 MHz. The current precision of ∼20 ppm is still worse than for the most recent results with p 4 He + , which gave an error of 3 ppm for the individual transition lines [5]. Due to limitations in antiproton beam quality this precision for p 4 He + is not likely to be improved anymore.…”

mentioning

confidence: 69%

First observation of two hyperfine transitions in antiprotonic 3He

Friedreich¹,

Barna²,

Caspers³

et al. 2011

Physics Letters B

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We report on the first experimental results for microwave spectroscopy of the hyperfine structure of normalp¯3He+. Due to the helium nuclear spin, normalp¯3He+ has a more complex hyperfine structure than normalp¯4He+, 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 false(n,Lfalse)=false(36,34false) 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.

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mentioning

confidence: 69%

First observation of two hyperfine transitions in antiprotonic 3He

Friedreich¹,

Barna²,

Caspers³

et al. 2011

Physics Letters B

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“…The experimental technique is a three-step process, referred to as laser-microwavelaser spectroscopy [5,6] (Fig. 1).…”

Section: Laser-microwave-laser Spectroscopymentioning

confidence: 99%

Microwave spectroscopy measurements of the hyperfine structure in antiprotonic 3He

et al. 2012

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We shall present here the first experimental results for microwave spectroscopy of the hyperfine structure of antiprotonic He-3 and a comparison to numerical simulations of the measurement. 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. The comparison of measured data to simulations allows to investigate the collisional processes between the helium atoms of the target medium and the antiprotonic helium atomcules. The collision rates can not be calculated exactly, but estimated by comparison of numeric simulations with the experimental results. Two out of four super-super-hyperfine (SSHF) transition lines of the (n, L) = (36, 34) state were observed. The measured frequencies of the

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Preliminary results from recent measurements of the antiprotonic helium hyperfine structure

Cited by 2 publications

References 33 publications

First observation of two hyperfine transitions in antiprotonic 3He

First observation of two hyperfine transitions in antiprotonic 3He

Microwave spectroscopy measurements of the hyperfine structure in antiprotonic 3He

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