Remeasurement of the magnetic moment of the antiproton

Kreissl, A.; Hancock, A. D.; Koch, H.; Köhler, Th.; Poth, H.; Raich, U.; Rohmann, D.; Wolf, A.; Tauscher, L.; Nilsson, A.; Suffert, M.; Chardalas, M.; Dedoussis, S.; Daniel, H.; Egidy, T. von; Hartmann, F. J.; Kanert, W.; Plendl, H. S.; Schmidt, G. L.; Reidy, J. J.

doi:10.1007/bf01549714

Cited by 60 publications

(32 citation statements)

References 12 publications

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“…Qualitatively the difference in shifts is consistent with the measurements done on the n =8 levels in 174 Yb, which indicate an enhancement of the electromagnetic fine structure splitting by nuclear LS interactions [13]. On the other hand, this effect does not exist in the neighboring 172 Yb,…”

Section: ͓12͔supporting

confidence: 88%

“…The LS splitting of its components gives clear evidence of a strong nuclear spin-orbit force contribution to the determined widths and shifts of this level. Till now there exists only conflicting evidence [4,13] on the observation of this effect in Yb isotopes. We believe that the 130 Te case opens a new interesting topic for further research.…”

Section: Discussionmentioning

confidence: 99%

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Strong interaction andE2effect in even-Aantiprotonic Te atoms

Kłos¹,

Wycech

Trzcińska

et al. 2004

Phys. Rev. C

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The x-ray cascade from antiprotonic atoms was studied for 122 Te, 124 Te, 126 Te, 128 Te, and 130 Te. Widths and shifts due to the strong interaction were deduced for several levels. The E2 nuclear resonance effect was observed in all investigated nuclei. In 130Te the E2 resonance allowed to determine level widths and shifts of the LS-split deeply bound ͑n , l͒ = ͑6,5͒ state, otherwise unobservable. The measured level widths and shifts, corrected for the E2-resonance effect, were used to investigate the nucleon density in the nuclear periphery. The deduced neutron distributions are compared with results of the previously introduced radiochemical method and with Hartree-Fock-Bogoliubov model calculations.

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Section: ͓12͔supporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Strong interaction andE2effect in even-Aantiprotonic Te atoms

Kłos¹,

Wycech

Trzcińska

et al. 2004

Phys. Rev. C

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“…The " p magnetic moment was previously deduced only from measured transition energies in exotic atoms in which a " p orbits a nucleus as a ''heavy electron.'' Measurements 25 and 4 years ago [3,4] both reached a 3000 ppm precision (Fig. 1).…”

mentioning

confidence: 99%

One-Particle Measurement of the Antiproton Magnetic Moment

et al. 2013

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For the first time a single trapped antiproton ( " p) is used to measure the " p magnetic moment " p . The moment " p ¼ " p S=ð@=2Þ is given in terms of its spin S and the nuclear magneton ( N ) by " p = N ¼ À2:792 845 AE 0:000 012. 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 " p = p ¼ À1:000 000 AE 0:000 005 to 5 ppm, for a proton moment p ¼ p S=ð@=2Þ, consistent with the prediction of the CPT theorem.

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“…Until this method has been proved experimentally, the only environment where the antiproton spin magnetic moment can be measured is in antiprotonic atoms. Indeed the current most precise measurement ((g p s −g p s )/g p s < 0.3%) was performed on antprotonic lead [5]. In 1996, the ASACUSA collaboration measured laser transitions between the (37,35) → (38,34) states of antiprotonic helium resolving the Hyperfine structure [6] leading to a measurment of the antiproton-proton spin magnetic moment ratio to a precission of 1.6% [7] in 2001.…”

Section: Introduction: Antiproton Spin Magnetic Momentmentioning

confidence: 99%

Preliminary results from recent measurements of the antiprotonic helium hyperfine structure

Pask¹

2009

Exa/Leap 2008

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We report on preliminary results from a systematic study of the hyperfine (HF) structure of antiprotonic helium. This precise measurement which was commenced in 2006, has now been completed. Our initial analysis shows no apparent density or power dependence and therefore the results can be averaged. The statistical error of the observable M1 transitions is a factor of 60 smaller than that of three body quantum electrodynamic (QED) calculations, while their difference has been resolved to a precision comparable to theory (a factor of 10 better than our first measurement). This difference is sensitive to the antiproton magnetic moment and agreement between theory and experiment would lead to an increased precision of this parameter, thus providing a test of CPT invariance.

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Remeasurement of the magnetic moment of the antiproton

Cited by 60 publications

References 12 publications

Strong interaction andE2effect in even-Aantiprotonic Te atoms

Strong interaction andE2effect in even-Aantiprotonic Te atoms

One-Particle Measurement of the Antiproton Magnetic Moment

Preliminary results from recent measurements of the antiprotonic helium hyperfine structure

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