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1. Systematic study of the decay rates of antiprotonic helium states

Author

Yamaguchi, H., Hayano, R. S., Ishikawa, T., Sakaguchi, J., Widmann, E., Eades, J., Hori, M., Torii, H. A., Juhasz, B., Horvath, D., and Yamazaki, T.

Subjects
Physics - Atomic Physics
Abstract

A systematic study of the decay rates of antiprotonic helium (\pbhef and \pbhet) at CERN AD (Antiproton Decelerator) has been made by a laser spectroscopic method. The decay rates of some of its short-lived states, namely those for which the Auger rates $\gamma_{\mathrm{A}}$ are much larger than their radiative decay rates ($\gamma_{\mathrm{rad}} \sim 1$ $\mu$s$^{-1}$), were determined from the time distributions of the antiproton annihilation signals induced by laser beams, and the widths of the atomic resonance lines. The magnitude of the decay rates, especially their relation with the transition multipolarity, is discussed and compared with theoretical calculations., Comment: 6 pages, 5 figures, and 1 table

Published
2004
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2. Precise laser spectroscopy of the antiprotonic helium atom and CPT test on antiproton mass and charge

Author

Yamaguchi, H., Eades, J., Hayano, R. S., Hori, M., Horvath, D., Ishikawa, T., Juhasz, B., Sakaguchi, J., Torii, H. A., Widmann, E., and Yamazaki, T.

Subjects
Nuclear Experiment
Abstract

We have measured twelve transition frequencies of the antiprotonic helium atom (pbar-He+) with precisions of 0.1--0.2 ppm using a laser spectroscopic method. The agreement between the experiment and theories was so good that we can put a limit on the proton-antiproton mass (or charge) difference. The new limit is expected to be much smaller than the already published value, 60 ppb., Comment: proceeding of the conference, "PANIC02"

Published
2003
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3. Hyperfine structure of antiprotonic helium revealed by a laser-microwave-laser resonance method

Author

Widmann, E., Hayano, R. S., Ishikawa, T., Sakaguchi, J., Tasaki, T., Yamaguchi, H., Eades, J., Hori, M., Torii, H. A., Juhász, B., Horváth, D., and Yamazaki, T.

Subjects
Physics - Atomic Physics
Abstract

Using a newly developed laser-microwave-laser resonance method, we observed a pair of microwave transitions between hyperfine levels of the $(n,L)=(37,35)$ state of antiprotonic helium. This experiment confirms the quadruplet hyperfine structure due to the interaction of the antiproton orbital angular momentum, the electron spin and the antiproton spin as predicted by Bakalov and Korobov. The measured frequencies of $\nu_{\text HF}^+ =12.89596 \pm 0.00034$ GHz and $\nu_{\text HF}^- =12.92467 \pm 0.00029$ GHz agree with recent theoretical calculations on a level of $ 6 \times10^{-5}$., Comment: 4 pages, 4 figures, 1 table

Published
2002
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4. Hyperfine Structure Measurements of Antiprotonic Helium and Antihydrogen

Author

Widmann, E., Eades, J., Hayano, R. S., Hori, M., Horvath, D., Ishikawa, T., Juhasz, B., Sakaguchi, J., Torii, H. A., Yamaguchi, H., and Yamazaki, T.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Physics - Atomic Physics
Abstract

This paper describes measurements of the hyperfine structure of two antiprotonic atoms that are planned at the Antiproton Decelerator (AD) at CERN. The first part deals with antiprotonic helium, a three-body system of alpha-particle, antiproton and electron that was previously studied at LEAR. A measurement will test existing three-body calculations and may - through comparison with these theories - determine the magnetic moment of the antiproton more precisely than currently available, thus providing a test of CPT invariance. The second system, antihydrogen, consisting of an antiproton and a positron, is planned to be produced at thermal energies at the AD. A measurement of the ground-state hyperfine splitting, which for hydrogen is one of the most accurately measured physical quantities, will directly yield a precise value for the magnetic moment of the antiproton, and also compare the internal structure of proton and antiproton through the contribution of the magnetic size of the antiproton to the ground state hyperfine splitting., Comment: Proceedings of the Hydrogen II workshop, Castiglione della Pescaia, June 1 --3, 2000, 15 pages, 8 figures

Published
2001

24. Antihydrogen production and precision experiments. The ATHENA collaboration

Author

Holzscheiter, M.H., Bendiscioli, G., Bertin, A., Bollen, G., Bruschi, M., Cesar, C., Charlton, M., Corradini, M., DePedis, D., Doser, M., Eades, J., Fedele, R., Feng, X., Galluccio, F., Goldman, T., Hangst, J.S., Hayano, R., Horváth, D., Hughes, R.J., King, N.S.P., Kirsebom, K., Knudsen, H., Lagomarsino, V., Landua, R., Laricchia, G., Lewis, R.A., Lodi-Rizzini, E., Macri, M., Manuzio, G., Marconi, U., Masullo, M.R., Merrison, J.P., Møller, S.P., Morgan, G.L., Nieto, M.M., Piccinini, M., Poggiani, R., Rotondi, A., Rouleau, G., Salvini, P., Semprini-Cesari, N., Smith, G.A., Surko, C.M., Testera, G., Torelli, G., Uggerhøj, E., Vaccaro, V.G., Venturelli, L., Vitale, A., Widmann, E., Yamazaki, T., Yamazaki, Y., Zanello, D., and Zoccoli, A.

Published
1997
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28. Photo- and hadro-production ofϕ (1020),K *(892)0 and $$\overline {K*} (892)^0 $$ mesons in the energy range 65 to 175 GeV

Author

Apsimon, R. J., Atkinson, M., Baake, M., Bagdasarian, L. S., Barberis, D., Brodbeck, T. J., Brook, N., Charity, T., Clegg, A. B., Coyle, P., Danaher, S., Danagulian, S., Davenport, M., Dickinson, B., Diekmann, B., Donnachie, A., Doyle, A. T., Eades, J., Ellison, R. J., Fiedler, F., Flower, P. S., Foster, J. M., Galbraith, W., Galumian, P. I., Gapp, C., Gebert, F., Hallewell, G., Heinloth, K., Henderson, R. C. W., Hickman, M. T., Hoeger, K. C., Hofmann, R. P., Holzkamp, A., Holzkamp, S., Hughes-Jones, R. E., Ibbotson, M., Jakob, H. P., Joseph, D., Keemer, N. R., Kingler, J., Körsgen, G., Kolya, S. D., Lafferty, G. D., McCann, H., McClatchey, R., McManus, C., Mercer, D., Morris, J. A. G., Morris, J. V., Newton, D., O'Connor, A., Oedingen, R., Oganesian, A. G., Ottewell, P. J., Paterson, C. N., Paul, E., Reid, D., Rotscheidt, H., Sharp, P. H., Soeldner-Rembold, S., Thacker, N. A., Thompson, L., Thompson, R. J., Waterhouse, J., Weigend, A. S., Wilson, G. W., and OMEGA Photon Collaboration

Published
1994
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30. A naturally occurring trap for antiprotons

Author

Eades, J., Morita, N., Ito, T. M., Ito, Y., Kawachi, A., Nakamura, S. N., Hayano, R. S., Iwasaki, M., Shigaki, K., Tamura, H., Sugai, I., Widmann, E., Yamazaki, T., Higemoto, W., Nishida, N., Hartmann, F. J., Daniel, H., von Egidy, T., Hofmann, P., and Kim, Y. -S.

Published
1993
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34. Comparison of photon and hadron induced production of ρ0 mesons in the energy range of 65 to 175 GeV

Author

Apsimon, R. J., Atkinson, M., Baake, M., Bagdasarian, L. S., Barberis, D., Brodbeck, T. J., Brook, N., Charity, T., Clegg, A. B., Coyle, P., Danaher, S., Danagulian, S., Davenport, M., Dickinson, B., Diekmann, B., Donnachie, A., Doyle, A. T., Eades, J., Ellison, R. J., Fiedler, F., Flower, P. S., Foster, J. M., Galbraith, W., Galumian, P. I., Gapp, C., Gebert, F., Hallewell, G., Heinloth, K., Henderson, R. C. W., Hickman, M. T., Hoeger, K. C., Hofmann, R. P., Holzkamp, A., Holzkamp, S., Hughes-Jones, R. E., Ibbotson, M., Jakob, H. P., Joseph, D., Keemer, N. R., Kingler, J., Körsgen, G., Kolya, S. D., Lafferty, G. D., McCann, H., McClatchey, R., McManus, C., Mercer, D., Morris, J. A. G., Morris, J. V., Newton, D., O'Connor, A., Oedingen, R., Oganesian, A. G., Ottewell, P. J., Paterson, C. N., Paul, E., Raid, D., Rotscheidt, H., Sharp, P. H., Soeldner-Rembold, S., Thacker, N. A., Thompson, L., Thompson, R. J., Waterhouse, J., Weigend, A. S., Wilson, G. W., and OMEGA Photon Collaboration

Published
1992
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36. Production off 2(1270) andf 0(975) mesons by photons and hadrons of energy 65–175 GeV

Author

Apsimon, R. J., Atkinson, M., Baake, M., Bagdasarian, L. S., Barberis, D., Brodbeck, T. J., Brook, N., Charity, T., Clegg, A. B., Coyle, P., Danaher, S., Danagulian, S., Davenport, M., Dickinson, B., Diekmann, B., Donnachie, A., Doyle, A. T., Eades, J., Ellison, R. J., Fiedler, F., Flower, P. S., Foster, J. M., Galbraith, W., Galumian, P. I., Gapp, C., Gebert, F., Hallewell, G., Heinloth, K., Henderson, R. C. W., Hickman, M. T., Hoeger, K. C., Hofmann, R. P., Holzkamp, A., Holzkamp, S., Hughes-Jones, R. E., Ibbotson, M., Jacob, H. P., Joseph, D., Keemer, N. R., Kingler, J., Körsgen, G., Kolya, S. D., Lafferty, G. D., McCann, H., McClatchey, R., McManus, C., Mercer, D., Morris, J. A. G., Morris, J. V., Newton, D., O'Connor, A., Oedingen, R., Oganesian, A. G., Ottewell, P. J., Paterson, C. N., Paul, E., Reid, D., Rotscheidt, H., Sharp, P. H., Söldner-Rembold, S., Thacker, N. A., Thompson, L., Thompson, R. J., Waterhouse, J., Weigend, A. S., Wilson, G. W., and OMEGA Photon Collaboration

Published
1992
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37. Inclusive production of η-mesons in πp,Kp and γp collisions at energies around 100 GeV

Author

Apsimon, R. J., Atkinson, M., Baake, M., Bagdasarian, L. S., Barberis, D., Brodbeck, T. J., Brook, N., Charity, T., Clegg, A. B., Coyle, P., Danaher, S., Danagulian, S., Davenport, M., Dickinson, B., Diekmann, B., Donnachie, A., Doyle, A. T., Eades, J., Ellison, R. J., Flower, P. S., Foster, J. M., Galbraith, W., Galumian, P. I., Gapp, C., Gebert, F., Hallewell, G., Heinloth, K., Henderson, R. C. W., Hickman, M. T., Hoeger, C., Holzkamp, A., Holzkamp, S., Hughes-Jones, R. E., Ibbotson, M., Jakob, H. P., Joseph, D., Keemer, N. R., Kingler, J., Koersgen, G., Kolya, S. D., Lafferty, G. D., McCann, H., McClatchey, R., McManus, C., Mercer, D., Morris, J. A. G., Morris, J. V., Newton, D., O'Connor, A., Oedingen, R., Oganesian, A. G., Ottewell, P. J., Paterson, C. N., Paul, E., Reid, D., Rotscheidt, H., Sharp, P. H., Soeldner-Rembold, S., Thacker, N. A., Thompson, L., Thompson, R. J., Waterhouse, J., Weigend, A. S., Wilson, G. W., and Omega Photon Collaboration

Published
1992
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38. Inclusive production of π0-mesons in πp,Kp and γp collisions at energies around 100 GeV

Author

Apsimon, R. J., Atkinson, M., Baake, M., Bagdasarian, L. S., Barberis, D., Brodbeck, T. J., Brook, N., Charity, T., Clegg, A. B., Coyle, P., Danaher, S., Danagulian, S., Davenport, M., Dickinson, B., Diekmann, B., Donnachie, A., Doyle, A. T., Eades, J., Ellison, R. J., Flower, P. S., Foster, J. M., Galbraith, W., Galumian, P. I., Gapp, C., Gebert, F., Hallewell, G., Heinloth, K., Henderson, R. C. W., Hickman, M. T., Hoeger, C., Holzkamp, A., Holzkamp, S., Hughes-Jones, R. E., Ibbotson, M., Jakob, H. P., Joseph, D., Keemer, N. R., Kingler, J., Koersgen, G., Kolya, S. D., Lafferty, G. D., McCann, H., McClatchey, R., McManus, C., Mercer, D., Morris, J. A. G., Morris, J. V., Newton, D., O'Connor, A., Oedingen, R., Oganesian, A. G., Ottewell, P. J., Paterson, C. N., Paul, E., Reid, D., Rotscheidt, H., Sharp, P. H., Soeldner-Rembold, S., Thacker, N. A., Thompson, L., Thompson, R. J., Waterhouse, J., Weigend, A. S., Wilson, G. W., and Omega Photon Collaboration

Published
1991
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39. Separation of minimum and higher twist in photoproduction of high-P T mesons

Author

Apsimon, R. J., Atkinson, M., Baake, M., Bagdasarian, L. S., Barberis, D., Brodbeck, T. J., Brook, N., Charity, T., Clegg, A. B., Coyle, P., Danaher, S., Danagulian, S., Davenport, M., Dickinson, B., Diekmann, B., Donnachie, A., Doyle, A. T., Eades, J., Ellison, R. J., Flower, P. S., Foster, J. M., Galbraith, W., Galumian, P. I., Gapp, C., Gebert, F., Hallewell, G., Heinloth, K., Henderson, R. C. W., Hickman, M. T., Hoeger, K. C., Holzkamp, A., Holzkamp, S., Hughes-Jones, R. E., Ibbotson, M., Ingelman, G., Jakob, H. P., Joseph, D., Keemer, N. R., Kingler, J., Koersgen, G., Kolya, S. D., Lafferty, G. D., McCann, H., McClatchey, R., McManus, C., Mercer, D., Morris, J. A. G., Morris, J. V., Newton, D., O'Connor, A., Oedingen, R., Oganesian, A. G., Ottewell, P. J., Paterson, C. N., Paul, E., Reid, D., Rotscheidt, H., Sharp, P. H., Soeldner-Rembold, S., Thacker, N. A., Thompson, L., Thompson, R. J., Waterhouse, J., Weigend, A. S., Wilson, G. W., and OMEGA Photon Collaboration

Published
1991
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40. Forward charge asymmetry in low-P T photoproduction of hadrons

Author

Apsimon, R. J., Atkinson, M., Baake, M., Bagdasarian, L. S., Barberis, D., Brodbeck, T. J., Brook, N., Charity, T., Clegg, A. B., Coyle, P., Danaher, S., Danagulian, S., Davenport, M., Dickinson, B., Diekmann, B., Donnachie, A., Doyle, A. T., Eades, J., Ellison, R. J., Flower, P. S., Foster, J. M., Galbraith, W., Galumian, P. I., Gapp, C., Gebert, F., Hallewell, G., Heinloth, K., Henderson, R. C. W., Hickman, M. P., Hoeger, K. C., Holzkamp, A., Holzkamp, S., Hughes-Jones, R. E., Ibbotson, M., Jakob, H. P., Joseph, D., Keemer, N. R., Kingler, J., Koersgen, G., Kolya, S. D., Lafferty, G. D., McCann, H., McClatchey, R., McManus, C., Mercer, D., Morris, J. A. G., Morris, J. V., Newton, D., O'Connor, A., Oedingen, R., Oganesian, A. G., Ottewell, P. J., Paterson, C. N., Paul, E., Reid, D., Rotscheidt, H., Sharp, P. H., Soeldner-Rembold, S., Thacker, N. A., Thompson, L., Thompson, R. J., Waterhouse, J., Weigend, A. S., Wilson, G. W., and OMEGA Photon Collaboration

Published
1990
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41. A study of the point-like interactions of the photon using energy-flows in photo- and hadro-production for incident energies between 65 and 170 GeV

Author

Apsimon, R. J., Atkinson, M., Baake, M., Bagdasarian, L. S., Barberis, D., Brodbeck, T. J., Brook, N., Charity, T., Clegg, A. B., Coyle, P., Danaher, S., Danagulian, S., Davenport, M., Dickinson, B., Diekmann, B., Donnachie, A., Doyle, A. T., Eades, J., Ellison, R. J., Flower, P. S., Foster, J. M., Galbraith, W., Galumian, P. I., Gapp, C., Gebert, F., Hallewell, G., Heinloth, K., Henderson, R. C. W., Hickman, M. T., Hoeger, C., Holzkamp, A., Holzkamp, S., Hughes-Jones, R. E., Ibbotson, M., Jakob, H. P., Joseph, D., Keemer, N. R., Kingler, J., Koersgen, G., Kolya, S. D., Lafferty, G. D., McCann, H., McClatchey, R., McManus, C., Mercer, D., Morris, J. A. G., Morris, J. V., Newton, D., O'Connor, A., Oedingen, R., Oganesian, A. G., Ottewell, P. J., Paterson, C. N., Paul, E., Reid, D., Rotscheidt, H., Sharp, P. H., Soeldner-Rembold, S., Thacker, N. A., Thompson, L., Thompson, R. J., Waterhouse, J., Weigend, A. S., Wilson, G. W., and The OMEGA Photon Collaboration

Published
1990
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46. Southern Industrial Development Council

Author

Eades, J. Michael

Subjects
Southern States -- Economic policy, Industrial development -- Southern United States, Business, Economics
Abstract

The Southern Industrial Development Council (SIDC) is a regional association that has a membership of some 1,600 economic development specialists from the 17 southern states. Founded in 1946, SIDC dedicates itself to the provision of education and training services to its members and to the promotion of professionalism in the industrial development field. One of its most notable achievements is the founding of the Industrial Development Institute at the University of Oklahoma, an instituution which still regularly receives faculty grants and student scholarships from the SIDC.

Published
1994

50. Formation of long-lived gas-phase antiprotonic helium atoms and quenching by H2

Author

Yamazaki, T., Widmann, E., Hayano, R.S., Iwasaki, M., Nakamura, S.N., Shigaki, K., Hartmann, F.J., Daniel, H., von Egidy, T., Hofmann, P., Kim, Y.-S., and Eades, J.

Subjects
Helium -- Research, Antiprotons -- Research, Hydrogen -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Metastable antiprotonic atoms were observed to endure for several microseconds in gaseous helium. Although the metastability of antiprotons in liquid helium had been previously verified, this is the first evidence that the particles are equally long-lasting in gas-phase helium. Furthermore, this metastability was terminated abruptly and completely by introducing hydrogen gas in minute quantities.

Published
1993

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