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4 results on '"Court, G R."'

1. Status on the Michigan???MIT ultra???cold polarized hydrogen jet target

Author

Randall Lab of Physics, University of Michigan, Ann Arbor, Michigan 48109???1120, Institute for High Energy Physics, RU???142284, Protvino, Russia, Physics Department, Liverpool University, P.O. Box 142, Liverpool, L693BX, Great Britain, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, Joint Institute for Nuclear Research, RU???141980, Dubna, Russia, Luppov, V. G., Blinov, B. B., Bywater, J. A., Chin, S., Churakov, V. V., Court, G. R., Kaufman, W. A., Kleppner, D., Krisch, A. D., Melnik, Yu. M., Muldavin, J. B., Nurushev, T. S., Price, J. S., Prudkoglyad, A. F., Raymond, R. S., Shutov, V. B., Stewart, J. A., Randall Lab of Physics, University of Michigan, Ann Arbor, Michigan 48109???1120, Institute for High Energy Physics, RU???142284, Protvino, Russia, Physics Department, Liverpool University, P.O. Box 142, Liverpool, L693BX, Great Britain, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, Joint Institute for Nuclear Research, RU???141980, Dubna, Russia, Luppov, V. G., Blinov, B. B., Bywater, J. A., Chin, S., Churakov, V. V., Court, G. R., Kaufman, W. A., Kleppner, D., Krisch, A. D., Melnik, Yu. M., Muldavin, J. B., Nurushev, T. S., Price, J. S., Prudkoglyad, A. F., Raymond, R. S., Shutov, V. B., and Stewart, J. A.

Abstract

Progress on the Mark???II ultra???cold polarized atomic hydrogen gas Jet target for the experiments NEPTUN???A and NEPTUN at UNK is presented. We describe the performance and the present status of different components of the jet.

Published
2011

2. Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2

Author

Naval Postgraduate School (U.S.), E155 Collaboration, Abe, K., Akagi, T., Anthony, P L., Antonov, R D., Arnold, R G., Averett, T., Band, H R., Bauer, J M., Borel, H., Bosted, P E., Breton, V., Button-Shafer, J., Chen, J P., Chupp, T E., Clendenin, J E., Comptour, C., Coulter, K P., Court, G R., Crabb, D., Daoudi, M., Day, D., Dietrich, F S., Dunne, J., Dutz, H., Erbacher, R D., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R A., Gómez, J., Grenier, P., Griffioen, K., Høibraten, S., Hughes, E W., Hyde-Wright, C E., Johnson, J R., Kawall, D., Klein, A., Kuhn, S E., Kuriki, M., Lindgren, R., Liu, T., Lombard-Nelsen, R M., Marroncle, J., Maruyama, T., Maruyama, X K., McCarthy, J., Meyer, W T., Meziani, Z E., Minehart, R C., Mitchell, J., Morgenstern, J., Petratos, G G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B A., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L S., Rock, S E., Rondon-Aramayo, O A., Sick, I., Smith, L C., Smith, T B., Spengos, M., Staley, F., Steiner, P., Saint-Lorant, S J., Stuart, L M., Suekane, F., Szalata, Z M., Tang, H., Terrien, Y., Usher, T., Walz, D., White, J L., Witte, K., Young, C C., Youngman, B., Yuta, H., Zapalac, G H., Zihlmann, B., Zimmerman, D., Naval Postgraduate School (U.S.), E155 Collaboration, Abe, K., Akagi, T., Anthony, P L., Antonov, R D., Arnold, R G., Averett, T., Band, H R., Bauer, J M., Borel, H., Bosted, P E., Breton, V., Button-Shafer, J., Chen, J P., Chupp, T E., Clendenin, J E., Comptour, C., Coulter, K P., Court, G R., Crabb, D., Daoudi, M., Day, D., Dietrich, F S., Dunne, J., Dutz, H., Erbacher, R D., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R A., Gómez, J., Grenier, P., Griffioen, K., Høibraten, S., Hughes, E W., Hyde-Wright, C E., Johnson, J R., Kawall, D., Klein, A., Kuhn, S E., Kuriki, M., Lindgren, R., Liu, T., Lombard-Nelsen, R M., Marroncle, J., Maruyama, T., Maruyama, X K., McCarthy, J., Meyer, W T., Meziani, Z E., Minehart, R C., Mitchell, J., Morgenstern, J., Petratos, G G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B A., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L S., Rock, S E., Rondon-Aramayo, O A., Sick, I., Smith, L C., Smith, T B., Spengos, M., Staley, F., Steiner, P., Saint-Lorant, S J., Stuart, L M., Suekane, F., Szalata, Z M., Tang, H., Terrien, Y., Usher, T., Walz, D., White, J L., Witte, K., Young, C C., Youngman, B., Yuta, H., Zapalac, G H., Zihlmann, B., and Zimmerman, D.

Abstract

We have measured the spin structure functions g2p and g2d and the virtual photon asymmetries A2p and A2d over the kinematic range 0.02 < x < 0.8 and 0.7 < Q^2 < 20 GeV^2 by scattering 29.1 and 32.3 GeV longitudinally polarized electrons from transversely polarized NH3 and 6LiD targets. Our measured g2 approximately follows the twist-2 Wandzura-Wilczek calculation. The twist-3 reduced matrix elements d2p and d2n are less than two standard deviations from zero. The data are inconsistent with the Burkhardt-Cottingham sum rule if there is no pathological behavior as x->0. The Efremov-Leader-Teryaev integral is consistent with zero within our measured kinematic range. The absolute value of A2 is significantly smaller than the sqrt[R(1+A1)/2] limit.

Published
2003

3. Precision Measurement of the Proton Spin Structure Function g1p

Author

Naval Postgraduate School (U.S.), E143 Collaboration, Abe, K., Akagi, T., Anthony, P L., Antonov, R D., Arnold, R G., Averett, T., Band, H R., Bauer, J M., Borel, H., Bosted, P E., Breton, V., Button-Shafer, J., Chen, J P., Chupp, T E., Clendenin, J E., Comptour, C., Coulter, K P., Court, G R., Crabb, D., Daoudi, M., Day, D., Dietrich, F S., Dunne, J., Dutz, H., Erbacher, R D., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R A., Gómez, J., Grenier, P., Griffioen, K., Høibraten, S., Hughes, E W., Hyde-Wright, C E., Johnson, J R., Kawall, D., Klein, A., Kuhn, S E., Kuriki, M., Lindgren, R., Liu, T., Lombard-Nelsen, R M., Marroncle, J., Maruyama, T., Maruyama, X K., McCarthy, J., Meyer, W T., Meziani, Z E., Minehart, R C., Mitchell, J., Morgenstern, J., Petratos, G G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B A., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L S., Rock, S E., Rondon-Aramayo, O A., Sick, I., Smith, L C., Smith, T B., Spengos, M., Staley, F., Steiner, P., Saint-Lorant, S J., Stuart, L M., Suekane, F., Szalata, Z M., Tang, H., Terrien, Y., Usher, T., Walz, D., White, J L., Witte, K., Young, C C., Youngman, B., Yuta, H., Zapalac, G H., Zihlmann, B., Zimmerman, D., Naval Postgraduate School (U.S.), E143 Collaboration, Abe, K., Akagi, T., Anthony, P L., Antonov, R D., Arnold, R G., Averett, T., Band, H R., Bauer, J M., Borel, H., Bosted, P E., Breton, V., Button-Shafer, J., Chen, J P., Chupp, T E., Clendenin, J E., Comptour, C., Coulter, K P., Court, G R., Crabb, D., Daoudi, M., Day, D., Dietrich, F S., Dunne, J., Dutz, H., Erbacher, R D., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R A., Gómez, J., Grenier, P., Griffioen, K., Høibraten, S., Hughes, E W., Hyde-Wright, C E., Johnson, J R., Kawall, D., Klein, A., Kuhn, S E., Kuriki, M., Lindgren, R., Liu, T., Lombard-Nelsen, R M., Marroncle, J., Maruyama, T., Maruyama, X K., McCarthy, J., Meyer, W T., Meziani, Z E., Minehart, R C., Mitchell, J., Morgenstern, J., Petratos, G G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B A., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L S., Rock, S E., Rondon-Aramayo, O A., Sick, I., Smith, L C., Smith, T B., Spengos, M., Staley, F., Steiner, P., Saint-Lorant, S J., Stuart, L M., Suekane, F., Szalata, Z M., Tang, H., Terrien, Y., Usher, T., Walz, D., White, J L., Witte, K., Young, C C., Youngman, B., Yuta, H., Zapalac, G H., Zihlmann, B., and Zimmerman, D.

Abstract

We have measured the ratio g[sup p][sub 1]/F[sup p][sub 1] over the range 0.029 < x < 0.8 and 1.3 < Q2 < 10 (GeV/c)2 using deep-inelastic scattering of polarized electrons from polarized ammonia. An evaluation of the integral (integral)g[sup p][sub 1](x,Q2)dx at fixed Q2 = 3 (GeV/c)2 yields 0.127 ± 0.004(stat) ± 0.010(syst), in agreement with previous experiments, but well below the Ellis-Jaffe sum rule prediction of 0.160 ± 0.006. In the quark-parton model, this implies Delta q = 0.27 ± 0.10.

Published
1994

4. RESEARCH ON IONISATION CHARACTERISTICS OF EASILY IONISABLE CHEMICALS

Author

BIRMINGHAM UNIV (UNITED KINGDOM), BATEY, P. H., COURT, G. R., SAYERS, J., BIRMINGHAM UNIV (UNITED KINGDOM), BATEY, P. H., COURT, G. R., and SAYERS, J.

Abstract

A laboratory method is outlined for studying some of the low energy ionic reactions that are likely to occur when easily ionisable chemicals are released into the ionosphere. The possibility of resolving some of the discrepancies in previous measurements of relevant cross-sections is discussed. The design of apparatus to make measurements in afterglows using a time resolving mass spectrometer and a Langmuir probe is described, and the construction and initial measurements of performance of the mass spectrometer are given in detail.

Published
1961

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