Strong interaction and mass measurements using antiprotonic atoms

Roberson, Peter L.; King, Thomas; Kunselman, R.; Miller, John P.; Powers, R. J.; Barnes, P. D.; Eisenstein, R. A.; Sutton, R.B.; Lam, W. C.; Cox, C.R.; Eckhause, M.; Kane, J. R.; Rushton, A.M.; Vulcan, W.; Welsh, R. E.

doi:10.1103/physrevc.16.1945

Cited by 58 publications

(25 citation statements)

References 38 publications

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“…This is an unusual result for/5 atoms. It is in agreement with an earlier, less precise measurement by Roberson et al [11] where, however, the fine-structure components could not be resolved.…”

Section: Resultssupporting

confidence: 93%

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First direct observation of strong interaction spin-orbit effects in antiprotonic atoms

Kreissl

Hancock

Koch

et al. 1988

Z. Physik A - Atomic Nuclei

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The strong p-nucleus spin-orbit interaction was investigated in a measurement of the strong-interaction effects of the 9 ~ 8 transition in t3174yb at the Low-Energy Antiproton Ring (LEAR) at CERN. This measurement was part of an experimental programme where, for the first time, the fine-structure components of the last observable X-ray transition in a i 0 atom, which carries information on the strong/3-nucleus interaction, were resolved and studied individually. The observed splitting A Eex p = 2408 _+ 26 eV consists of the electromagnetic fine-structure splitting Z]EFs-----2350 eV and an additional splitting Ae=58__26 eV. In addition, one finds a significant difference in the level widths of AF = 195_+ 59 eV with the larger value F, t = 1216_+41 eV for the lower fine-structure level. This experiment follows an earlier measurement on/3138Ba, where the transition 8--, 7 is influenced by the strong interaction, In this case, however, the fine-structure components could not be resolved. The results for 174yb may be attributed to a spin-orbit (LS) term in the complex strong-interaction potential.

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Section: Resultssupporting

confidence: 93%

“…For ~74yb there exists a previous measurement [11], which is in agreement with our results. However, our new measurement ira- [15] proved the precision by about one order of magnitude.…”

Section: Average Shifts and Widthssupporting

confidence: 95%

First direct observation of strong interaction spin-orbit effects in antiprotonic atoms

Kreissl

Hancock

Koch

et al. 1988

Z. Physik A - Atomic Nuclei

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“…Further measurements, still at Brookhaven, 25 of the fine structure splitting continued to improve the knowledge of the antiproton mass (mp = 938.229 ± 0.049 MeV, Table 1) but were still hampered by theoretical uncertainties and -more importantly -detector resolution.…”

Section: /2mentioning

confidence: 99%

“…For this, he measured their cyclotron frequencies in the Penning trap in which the antiprotons were confined and with this method achieved a factor of 1000 improvement in precision relative to the previous best values coming from exotic antiprotonic atoms. 25,65 In rapid succession, they further refined and improved their sensitivity, reaching first a precision of 1 ppb 66 with a single trapped antiproton before extending the technique to a 90 ppt precision ( Table 1). The main systematics limiting the previous measurements were addressed in this final measurement at the LEAR complex: the use of an H − ion instead of a proton, and simultaneous confinement of the antiproton and the H − ion in the same trap (Fig.…”

Section: Charge and Mass: Trap Atrap And Asacusamentioning

confidence: 99%

“…the Rydberg constant of the exotic atom, and the cyclotron frequency of trapped negative particles) allow factorising charge and mass. A test to 10 ppm of the equality of the charges and masses of antiprotons and protons 24 combines measurements of transitions in antiprotonic atoms 25 and of the cyclotron frequencies of trapped (anti)protons, 74 and is limited only by the precision achievable in the exotic atoms' transitions.…”

Section: 69mentioning

confidence: 99%

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