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263 results on '"Gearhart, R A."'

1. Search for Free Decay of Negative Pions in Water and Light Materials

Author

Numao, T., Davydov, Yu. I., Poutissou, J-M., Awes, T. C., Cianciolo, V., Berridge, S., Bugg, W., Efremenko, Yu., Gearhart, R., and Ovchinnikov, S.

Subjects
High Energy Physics - Experiment
Abstract

We report on a search for the free decay component of pi- stopped in water and light materials. A non-zero value of this would be an indication of anomalous nu_e contamination to the nu_e and nu_mu_bar production at stopped-pion neutrino facilities. No free decay component of pi- was observed in water, Beryllium, and Aluminum, for which upper limits were established at 8.2E-4, 3.2E-3, and 7.7E-3, respectively.

Published
2006
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2. Beam Test of Gamma-ray Large Area Space Telescope Components

Author

Atwood, W. B., Ritz, S., Anthony, P., Bloom, E. D., Bosted, P. E., Bourotte, J., Chaput, C., Chen, X., Chenette, D. L., Engovatov, D., Erickson, R., Fieguth, T., Fleury, P., Gearhart, R., Godfrey, G., Grove, J. E., Hernando, J. A., Hirayama, M., Jaggar, S., Johnson, R. P., Johnson, W. N., Jones, B. B., Kroeger, W., Lin, Y. C., Meetre, C., Michelson, P. F., Milne, P. A., Moiseev, A., Nolan, P., Norris, J. P., Oreglia, M., Ormes, J. F., Phlips, B. F., Pocar, A., Sadrozinski, H. F. -W., Szalata, Z., Thompson, D. J., and Tompkins, W. F.

Subjects
Physics - Instrumentation and Detectors, Physics - Space Physics
Abstract

A beam test of GLAST (Gamma-ray Large Area Space Telescope) components was performed at the Stanford Linear Accelerator Center in October, 1997. These beam test components were simple versions of the planned flight hardware. Results on the performance of the tracker, calorimeter, and anti-coincidence charged particle veto are presented., Comment: 39 pages, 21 figures

Published
1999
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3. Inclusive Electron Scattering from Nuclei at $x \simeq 1$

Author

Arrington, J., Anthony, P., Arnold, R. G., Beise, E. J., Belz, J. E., Bosted, P. E., Bulten, H. -J., Chapman, M. S., Coulter, K. P., Dietrich, F., Ent, R., Epstein, M., Filippone, B. W., Gao, H., Gearhart, R. A., Geesaman, D. F., Hansen, J. -O., Holt, R. J., Jackson, H. E., Jones, C. E., Keppel, C. E., Kinney, E. R., Kuhn, S., Lee, K., Lorenzon, W., Lung, A., Makins, N. C. R., Margaziotis, D. J., McKeown, R. D., Milner, R. G., Mueller, B., Napolitano, J., Nelson, J., O'Neill, T. G., Papavassiliou, V., Petratos, G. G., Potterveld, D. H., Rock, S. E., Spengos, M., Szalata, Z. M., Tao, L. H., vanBibber, K., Brand, J. F. J. van den, White, J. L., Winter, D., and Zeidman, B.

Subjects
Nuclear Experiment
Abstract

The inclusive A(e,e') cross section for $x \simeq 1$ was measured on $^2$H, C, Fe, and Au for momentum transfers $Q^2$ from 1-7 (GeV/c)$^2$. The scaling behavior of the data was examined in the region of transition from y-scaling to x-scaling. Throughout this transitional region, the data exhibit $\xi$-scaling, reminiscent of the Bloom-Gilman duality seen in free nucleon scattering., Comment: 4 pages, RevTeX; 4 figures (postscript in .tar.Z file)

Published
1995
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5. TOTAL AND PARTIAL y p CROSS SECTIONS AT 9.3 GeV

Author

Bingham, H.H., Fretter, W.B., Podolsky, W.J., Rabin, M.S., Rosenfeld, A.H., Smadja, G., Ballam, J., Chadwick, G.B., Eisenberg, Y., Gearhart, R., Kogan, E., Moffeit, K.C., Murray, J.J., Seyboth, P., Sinclair, C.K., Skillicorn, I.O., Spitzer, H., and Wolf, G. (SLAC).

Published
1973

12. Measurement of R = σ L /σ T and F 2 on Deuterium and Iron in Deep Inelastic Electron Scattering

Author

Rock, S. E., Dasu, S., Walker, R. C., Whitlow, L. W., Alster, J., Arnold, R., de Barbaro, P., Benton, D., Bodek, A., Bosted, P., Button-Shafer, J., deChambrier, G., Clogher, L., Debebe, B., Dietrich, F., Filippone, B., Gearhart, R., Harada, H., Hicks, R., Jourdan, J., Krasny, M. W., Lang, K., Lung, A., Milner, R., McKeown, R., Para, A., Potterveld, D., Riordan, E. M., Szalata, Z. M., Van Bibber, K., Kotthaus, Rainer, editor, and Kühn, Johann H., editor

Published
1989
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14. Measurements of the nucleon form factors at large momentum transfers

Author

Andivahis, L., primary, Bosted, P., additional, Lung, A., additional, Arnold, R., additional, Keppel, C., additional, Rock, S., additional, Spengos, M., additional, Szalata, Z., additional, Tao, L., additional, Stuart, L., additional, Dietrich, F., additional, Alster, J., additional, Lichtenstadt, J., additional, Chang, C., additional, Dodge, W., additional, Gearhart, R., additional, Kuhn, S., additional, Gomez, J., additional, Griffioen, K., additional, Hicks, R., additional, Miskimen, R., additional, Peterson, G., additional, Rokni, S., additional, Hyde-Wright, C., additional, Swartz, K., additional, Petratos, G., additional, and Sakumoto, W., additional

Published
1992
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15. Next-to-leading order QCD analysis of polarized deep inelastic scattering data

Author

Abe, K., Akagi, T., Anderson, B. D., Anthony, P. L., Arnold, R. G., Averett, T., Band, H. R., Berisso, C. M., Bogorad, P., Borel, H., Bosted, P. E., Breton, V., Buenerd, M. J., Cates, G. D., Chupp, T. E., Churchwell, S., Coulter, K. P., Daoudi, M., Decowski, P., Erickson, R., Fellbaum, J. N., Fonvieille, H., Gearhart, R., Ghazikhanian, V., Griffioen, K. A., Hicks, R. S., Holmes, R., Hughes, E. W., Igo, G., Sebastien Incerti, Johnson, J. R., Kahl, W., Khayat, M., Kolomensky, Yu G., Kuhn, S. E., Kumar, K., Kuriki, M., Lombard-Nelsen, R., Manley, D. M., Marroncle, J., Maruyama, T., Marvin, T., Meyer, W., Meziani, Z. -E, Miller, D., Mitchell, G., Olson, M., Peterson, G. A., Petratos, G. G., Pitman, R., Prepost, R., Raines, P., Raue, B. A., Reyna, D., Rochester, L. S., Rock, S. E., Romalis, M. V., Sabatie, F., Shapiro, G., Shaw, J., Smith, T. B., Sorrell, L., Souder, P. A., Staley, F., Lorant, S. St, Stuart, L. M., Suekane, F., Szalata, Z. M., Terrien, Y., Thompson, A. K., Toole, T., Wang, X., Watson, J. W., Welsh, R. C., Wesselmann, F. R., Wright, T., Young, C. C., Youngman, B., Yuta, H., Zhang, W. -M, Zyla, P., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), E154, and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Quantum chromodynamics, Quark, Nuclear and High Energy Physics, Particle physics, Valence (chemistry), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, Perturbative QCD, Deep inelastic scattering, 01 natural sciences, Gluon, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Neutron, Sum rule in quantum mechanics, 010306 general physics
Abstract

We present a Next-to-Leading order perturbative QCD analysis of world data on the spin dependent structure functions $g_1^p, g_1^n$, and $g_1^d$, including the new experimental information on the $Q^2$ dependence of $g_1^n$. Careful attention is paid to the experimental and theoretical uncertainties. The data constrain the first moments of the polarized valence quark distributions, but only qualitatively constrain the polarized sea quark and gluon distributions. The NLO results are used to determine the $Q^2$ dependence of the ratio $g_1/F_1$ and evolve the experimental data to a constant $Q^2 = 5 GeV^2$. We determine the first moments of the polarized structure functions of the proton and neutron and find agreement with the Bjorken sum rule., Comment: 21 pages, 4 figures; final version to be published in Phys. Lett. B. References updated. Uses elsart.cls version 1996/04/22, 2e-1.41

Published
1997
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16. Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2

Author

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., and Naval Postgraduate School (U.S.)

Abstract

The article of record as published may be found at https://doi.org/10.1016/S0370-2693(02)03015-0 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

17. Measurements of the $Q^2$ dependence of the proton and neutron spin structure functions $g^p_1$ and $g^n_1$

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

he structure functions g1p and g1n have been measured over the range 0.014 < x < 0.9 and 1 < Q2 < 40 GeV2 using deep-inelastic scattering of 48 GeV longitudinally polarized electrons from polarized protons and deuterons. We find that the Q2 dependence of g1p (g1n) at fixed x is very similar to that of the spin-averaged structure function F1p (F1n). From a NLO QCD fit to all available data we find $\Gamma_1^p - \Gamma_1^n =0.176 \pm 0.003 \pm 0.007$ at Q2=5 GeV2, in agreement with the Bjorken sum rule prediction of 0.182 \pm 0.005.

Published
2000

18. Measurements of R = σL/σT for 0.03 < x < 0.1 and Fit to World Data

Author

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

Abstract

Measurements were made at SLAC of the cross section for scattering 29 GeV electrons from carbon at a laboratory angle of 4.58, corresponding to 0.03-x-0.1 and 1.3-Q2-2.7 GeV2. Values of RssLrsT were extracted in this kinematic range by comparing these data to cross sections measured at a higher beam energy by the NMC collaboration. The results are in reasonable agreement with pQCD calculations and with extrapolations of the R1990 parameterization of previous data. A new fit is made including these data and other recent results. q1999 Published by Elsevier Science B.V. All rights reserved. This work was supported by Department of Energy contracts: No. W-2705-Eng-48 ŽLLNL., No. DE-AC03-76SF00515 ŽSLAC., No. DE-FG03- 88ER40439 ŽStanford., Nos. DE-FG05-88ER40390 and DEFG05-86ER40261 ŽVirginia., and No. DE- AC02-76ER00881 ŽWisconsin.; by National Science Foundation Grants No. 9114958 ŽAmerican., No. 9307710 ŽMassachusetts., No. 9217979 ŽMichigan., and No. 9104975 ŽODU.; by the Schweizerische Nationalfonds ŽBasel.; by the Commonwealth of Virginia; and by the Ministry of Science, Culture and Education of Japan ŽTohoku.. This work was supported by Department of Energy contracts: No. W-2705-Eng-48 LLNL., No. DE-AC03-76SF00515 ŽSLAC., No. DE-FG03- 88ER40439 Stanford., Nos. DE-FG05-88ER40390 and DEFG05-86ER40261 Virginia., and No. DE- AC02-76ER00881 Wisconsin.; by National Science Foundation Grants No. 9114958 American., No. 9307710 Massachusetts., No. 9217979 Michigan., and No. 9104975 ŽODU.; by the Schweizerische Nationalfonds ŽBasel.; by the Commonwealth of Virginia; and by the Ministry of Science, Culture and Education of Japan Tohoku..

Published
1999

19. Measurement of the deuteron spin structure function $g^{d}_1(x)$ for $1\ (GeV/c)^2 < Q^2 < 40\ (GeV/c)^2$

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment
Abstract

New measurements are reported on the deuteron spin structure function g_1^d. These results were obtained from deep inelastic scattering of 48.3 GeV electrons on polarized deuterons in the kinematic range 0.01 < x < 0.9 and 1 < Q^2 < 40 (GeV/c)^2. These are the first high dose electron scattering data obtained using lithium deuteride (6Li2H) as the target material. Extrapolations of the data were performed to obtain moments of g_1^d, including Gamma_1^d, and the net quark polarization Delta Sigma.

Published
1999

20. Measurement of the deuteron spin structure function $g_{1}^{d}(x)$ for $1 (GeV/c)^{2} < Q^{2} < 40 (GeV/c)^{2}$

Author

Anthony, P L, Arnold, R G, Averett, T, Band, H R, Berisso, M C, Borel, H, Bosted, P E, Bültmann, S, Buénerd, M, Chupp, T E, Churchwell, S, Court, G R, Crabb, D, Day, D, Decowski, P, De Pietro, P, Erbacher, R D, Erickson, R, Feltham, A, Fonvieille, H, Frlez, E, Gearhart, R A, Ghazikhanian, V, Gómez, J, Griffioen, K A, Harris, C, Houlden, M A, Hughes, E W, Hyde-Wright, C E, Igo, G, Incerti, S, Jensen, J, Johnson, J R, King, P M, Kolomensky, Yu G, Kuhn, S E, Lindgren, R, Lombard-Nelsen, R M, Marroncle, J, McCarthy, J, McKee, P M, Meyer, W T, Mitchell, G, Mitchell, J, Olson, M N, Penttilä, S, Peterson, G, Petratos, G G, Pitthan, R, Pocanic, D, Prepost, R, Prescott, C, Qin, L M, Raue, B A, Reyna, D, Rochester, L S, Rock, S E, Rondon-Aramayo, O A, Sabatié, F, Sick, I, Smith, T, Sorrell, L, Staley, F, Saint-Lorant, S J, Stuart, L M, Szalata, Z M, Terrien, Y, Tobias, A, Todor, L, Toole, T, Trentalange, S, Walz, D, Welsh, R C, Wesselmann, F R, Wright, T R, Young, C C, Zeier, M, Zhu, H, and Zihlmann, B

Subjects
Nuclear Physics
Published
1999

21. Measurement of the proton and deuteron spin structure functions $g_{2}$ and asymmetry $A_{2}^{1}$

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.K., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1999

22. Inclusive hadron photoproduction from longitudinally polarized protons and deuterons

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
Nuclear Theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment
Abstract

We report measurements of the asymmetry A_parallel for inclusive hadron production on longitudinally polarized proton and deuteron targets by circularly polarized photons. The photons were produced via internal and external bremsstrahlung from an electron beam of 48.35 GeV. Asymmetries for both positive and negative signed hadrons, and a subset of identified pions, were measured in the momentum range 10

Published
1999

23. Measurements of the Proton and Deuteron Spin Structure Functions g1 and g2

Author

The E143 Collaboration, Abe, K., Akagi, T., Anthony, P.L., Antonov, R., Arnold, R.G., Averett, T., Band, H.R., Bauer, J.M., Borel, H., Bosted, P.E., Breton, V., Button-Shafer, J., Chen, J.P., Chump, T.E., Clendenin, J., Comptour, C., Coulter, K.P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F.S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K.A., Hoibraten, S., Hughes, E.W., Hyde-Wright, C., Johnson, J.R., Kawall, D., Klein, A., Kuhn, S.E., Kuriki, M., Lindgren, R., Liu, T.J., Lombard-Nelsen, R.M., Marroncle, J., Maruyama, T., Maruyama, X.K, McCarthy, J., Meyer, W., Meziani, Z.-E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G.G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L.S., Rock, S.E., Rondon, O.A., Sick, I., Smith, L.C., Smith, T.B., Spengos, M., Staley, F., Steiner, P., St. Lorant, S., 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., Zihlmann, B., and Zimmermann, D.

Abstract

SLAC-PUB-7753, February 1998 Measurements are reported of the proton and deuteron spin structure functions gp1 and gd1 at beam energies of 29.1, 16.2, and 9.7 GeV, and gp2 and gd2 at a beam energy of 29.1 GeV. Work supported in part by Department of Energy contract DE-AC03-76SF00515.

Published
1998

24. Measurements of the proton and deuteron spin structure functions $g_{1}$ and $g_{2}$

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K. A., Hoibraten, S., Hughes, E. W., Hyde-Wright, C., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L., Rock, S. E., Rondon, O. A., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., Wesselmann, F., White, J. L., Witte, K., Young, C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

Measurements are reported of the proton and deuteron spin structure functions g1 at beam energies of 29.1, 16.2, and 9.7 GeV and g2 at a beam energy of 29.1 GeV. The integrals of g1 over x have been evaluated at fixed Q**2 = 3 (GeV/c)**2 using the full data set. The Q**2 dependence of the ratio g1/F1 was studied and found to be small for Q**2 > 1 (GeV/c)**2. Within experimental precision the g2 data are well-described by the Wandzura-Wilczek twist-2 contribution. Twist-3 matrix elements were extracted and compared to theoretical predictions. The asymmetry A2 was measured and found to be significantly smaller than the positivity limit for both proton and deuteron targets. A2 for the proton is found to be positive and inconsistent with zero. Measurements of g1 in the resonance region show strong variations with x and Q**2, consistent with resonant amplitudes extracted from unpolarized data. These data allow us to study the Q**2 dependence of the first moments of g1 below the scaling region.

Published
1998

25. Measurement of the proton and deuteron spin structure function $g_1$ in the resonance region

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R. A., Gomez, J., Grenier, P., Griffioen, K. A., Hoibraten, S., Hughes, E. W., Hyde-Wright, C. E., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., 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, O. A., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., Wesselmann, F., White, J. L., Witte, K., Young, C. C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmerman, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

We have measured the proton and deuteron spin structure functions g[sup p][sub 1] and g[sup d][sub 1] in the region of the nucleon resonances for W2 < 5GeV2 and Q2(similar, equals)0.5 and Q2(similar, equals)1.2GeV2 by inelastically scattering 9.7 GeV polarized electrons off polarized 15NH3 and 15ND3 targets. We observe significant structure in g[sup p][sub 1] in the resonance region. We have used the present results, together with the deep-inelastic data at higher W2, to extract Gamma (Q2)(equivalent)01 g1(x,Q2)dx. This is the first information on the low-Q2 evolution of Gamma toward the Gerasimov-Drell-Hearn limit at Q2 = 0.

Published
1997

26. Measurement of the Proton and Deuteron Spin Structure Function g1 in the Resonance Region

Author

Gearhart, R., Abe, K., Akagi, T., Anthony, P.L., Antonov, R., Arnold, R.G., Averett, T., Band, H.R., Bauer, J.M., Borel, H., Boasted, P.E., Breton, V., Button-Shafer, J., Chen, J.P., Chupp, T.E., Clendenin, J., Comptour, C., Coulter, K.P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F.S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gomez, J., Grenier, P., Griffioen, K.A., Hoibraten, S., Hughes, E.W., Hyde-Wright, C.E., Johnson, J.R., Kawall, D., Klein, A., Kuhn, S.E., Kuriki, M., Lindgren, R., Liu, T.J., Lombard-Nelson, R.M., Marroncle, J., Maruyama, T., Maruyama, X.K., McCarthy, J., Meyer, W., Meziani, Z.-E., Minehart, R., 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, O.A., Sick, I., Smith, L.C., Smith, T.B., Spengos, M., Staley, F., Steiner, P., St. Lorant, S., Stuart, L.M., Suekane, F., Szalata, Z.M., Tang, H., Terrien, Y., Usher, T., Walz, D., Wesselmann, F., White, J.L., Witte, K., Young, C.C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., and The E143 Collaboration

Subjects
High Energy Physics::Experiment
Abstract

(Accepted in Phys. Rev. Lett.) The nucleon spin structure functions g1 and g2 have been and continue to be intensively studied via deep- inelastic lepton scattering [1–6]; however, they remain largely undetermined in the resonance region, where the squared invariant mass of the final state W2 is less than 4 GeV2.

Published
1997

27. Deep inelastic scattering of polarized electrons by polarized $^3$He and the study of the neutron spin structure

Author

Anthony, P. L., Arnold, R. G., Band, H. R., Borel, H., Bosted, P. E., Vincent Breton, Cates, G. D., Chupp, T. E., Dietrich, F. S., Dunne, J., Erbacher, R., Fellbaum, J., Fonvieille, H., Gearhart, R., Holmes, R., Hughes, E. W., Johnson, J. R., Kawall, D., Keppel, C., Kuhn, S. E., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Meyer, W., Meziani, Z. E., Middleton, H., Morgenstern, J., Newbury, N. R., Petratos, G. G., Pitthan, R., Prepost, R., Roblin, Y., Rock, S. E., Rokni, S. H., Shapiro, G., Smith, T., Souder, P. A., Spengos, M., Staley, F., Stuart, L. M., Szalata, Z. M., Terrien, Y., Thompson, A. K., White, J. L., Woods, M., Xu, J., Young, C. C., Zapalac, G., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E142

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

The neutron longitudinal and transverse asymmetries $A^n_1$ and $A^n_2$ have been extracted from deep inelastic scattering of polarized electrons by a polarized $^3$He target at incident energies of 19.42, 22.66 and 25.51 GeV. The measurement allows for the determination of the neutron spin structure functions $g^n_1 (x,Q^2)$ and $g^n_2(x,Q^2)$ over the range $0.03 < x < 0.6$ at an average $Q^2$ of 2 (GeV$/c)^2$. The data are used for the evaluation of the Ellis-Jaffe and Bjorken sum rules. The neutron spin structure function $g^n_1 (x,Q^2)$ is small and negative within the range of our measurement, yielding an integral ${\int_{0.03}^{0.6} g_1^n(x) dx}= -0.028 \pm 0.006 (stat) \pm 0.006 (syst) $. Assuming Regge behavior at low $x$, we extract $\Gamma_1^n=\int^1_0 g^n_1(x)dx = -0.031 \pm 0.006 (stat)\pm 0.009 (syst) $. Combined with previous proton integral results from SLAC experiment E143, we find $\Gamma_1^p - \Gamma_1^n = 0.160 \pm 0.015$ in agreement with the Bjorken sum rule prediction $\Gamma^p_1 - \Gamma ^n_1 = 0.176 \pm 0.008$ at a $Q^2$ value of 3 (GeV$/c)^2$ evaluated using $\alpha_s = 0.32\pm 0.05$.

Published
1996

28. Measurements of the Q2-Dependence of the Proton and Deuteron Spin Structure Functions g1p and g1d

Author

Abe, K., Akagi, T., Anthony, P.L., Antonov, R., Arnold, R.G., Averett, T., Band, H.R., Bauer, J.M., Borel, H., Bested, P.E., Breton, V., Button-Shafer, J., Chen, J.P., Chupp, T.E., Clendenin, J., Comptour, C., Coulter, K.P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F.S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Greniere, P., Griffioen, K.A., Hoibraten, S., Hughes, E.W., Hyde-Wright, C., Johnson, J.R., Kawall, D., Klein, A., Kuhn, S.E., Kuriki, M., Lindgren, R., Liu, T.J., Lombard-Nelsen, R.M., Marroncle, J., Maruyarna, T., Maruyama, X.K., McCarthy, J., Meyer, W., Meziani, Z.-E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G.G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L.S., Rocka, S.E., Rondon, O.A., Sick, I., Smith, L.C., Smith, T.B., Spengosa, M., Staleye, F., Steiner, P., St. Lorant, S., 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., Zihlmann, B., and Zimmerman, D.

Abstract

The ratio g1/F1 has been measured over the range 0.031 (GeV/c)2. A trend is observed for g1/F1 to decrease at lower Q2. Fits to world data with and without a possible Q2-dependence in g1/F1 are in agreement with the Bjorken sum rule, but Delta_q is substantially less than the quark-parton model expectation.

Published
1995

29. Measurements of the Proton and Deuteron Spin Structure Function g2 and Asymmetry A2

Author

Garvey, D., Maruyama, X.K., The E143 Collaboration, Abe, K., Akagi, T., Anthony, P.L., Antonov, R., Arnold, R.G., Averett, T., Band, H.R., Bauer, J.M., Borel, H., Bosted, P.E., Breton, V., Button-Shafer, J., Chen, J.P., Chump, T.E., Clendenin, J., Comptour, C., Coulter, K.P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F.S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K.A., Hoibraten, S., Hughes, E.W., Hyde-Wright, C., Johnson, J.R., Kawall, D., Klein, A., Kuhn, S.E., Kuriki, M., Lindgren, R., Liu, T.J., Lombard-Nelsen, R.M., Marroncle, J., Maruyama, T., McCarthy, J., Meyer, W., Meziani, Z.-E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G.G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L.S., Rock, S.E., Rondon, O.A., Sick, I., Smith, L.C., Smith, T.B., Spengos, M., Staley, F., Steiner, P., St. Lorant, S., 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., Zihlmann, B., and Zimmermann, D.

Abstract

Submitted to Physical Review Letters. The article of record may be found at http://dx.doi.org/10.1103/PhysRevLett.76.587. We have measured proton and deuteron virtual photon-nucleon asymmetries Ap2 and Ad2 and structure functions gp2 and gd2 over the range 0.03

Published
1995

30. Precision measurement of the deuteron spin structure function gd1

Author

Abe, K., Akagi, T., Anthony, P.L., Antonov, R., 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., Comptour, C., Coulter, K.P., Court, S.G., Crabb, D., Daoudi, M., Day, D., Dietrich, F.S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K.A., Hoibraten, S., Hughes, E.W., Hyde-Wright, C., 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., Meziani, Z.-E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G.G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L.S., Rock, S.E., Rondon, O.A., Sick, I., Smith, L.C., Smith, T.B., Spengos, M., Staley, F., Steiner, P., St. Lorant, S., 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., Zihlmann, B., Zimmermann, D., E143 Collaboration, Naval Postgraduate School (U.S.), and Physics

Abstract

We report on a high-statistics measurement of'. the deuteron spin structure function g(di) at a beam energy of 29 GeV in the kinematic range 0.029 < x < 0.8 and 1 < Q2 < IO (GeV / c) (2) • The integral r(di) = f(1o) g(di) dx evaluated at fixed Q2 = 3 (GeV/c) 2 gives 0.042 ± 0.003(stat) ± 0.004(syst). Combining this result with our earlier measurement of g(di), we find r(pi) - r(nt) = 0.163 ± O.OIO(stat) ± 0.016(syst), which agrees with the prediction of the Bjorken sum rule with O(a(3x)) corrections, r(pi) - r(ni) = 0.171 ± 0.008. We find the quark contribution to the proton helicity to be liq = 0.30 ± 0.06. This work was supported by Department of Energy Contracts No. DE-AC05-84ER40150 (CEBAF), No. W-2795-Eng-48 (LLNL), No. DE-AC0376SF00515 (SLAC), No. DE-FG03-88ER40439 (Stanford), No. DE-FG05-88ER40390 and No. DEFG05-86ER4026 (Virginia), and No. DE-AC02-76ER00881 (Wisconsin); by National Science Foundation Grants No. 9114958 (American), No. 9307710 (Massachusetts), No. 9217979 (Michigan), No. 9104975 (ODU) and No. 9118137 (U. Penn.); by the Schweizersche Nationalfonds (Basel); by the Commonwealth of Virginia (Virginia); by the Centre NAtional de la Recherche Scientifique and the Commissariat a l'Energie Atomique (French groups); and by the Japanese Ministry of Education, Science and Culture (Tohoku).

Published
1995

31. Precision measurement of R = $\sigma_{L}$/$\sigma_{T}$ on hydrogen, deuterium, and beryllium targets in deep inelastic electron scattering

Author

Tao, L H, Andivahis, L, Anthony, P L, Arnold, R G, Banerjee, A, Bodek, Arie, Bosted, P E, Button-Shafer, J, Dasu, S, De Barbaro, P, Dietrich, F S, Dunne, J, Frodyma, M B, Gearhart, R A, Gómez, J, Griffioen, K A, Hicks, R A, Hyde-Wright, C E, Keppel, C E, Kuhn, S E, Lung, A, Peterson, G A, Petratos, G G, Riordan, Michael, Rock, S E, Rokni, S H, Spengos, M, Stuart, L M, Szalata, Z M, Van Bibber, K, Walker, R, Wang, K, White, J L, and Yang, U K

Subjects
Particle Physics - Experiment
Published
1995

32. Precision measurement of the proton spin structure function $g^{p}_{1}$

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K. A., Hoeibraten, S., Hughes, E. W., Hyde-Wright, C., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L., Rock, S. E., Rondon, O. A., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., White, J. L., Witte, K., Young, C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
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
1995

33. Precision measurement of the proton spin structure function g(p1)

Author

Abe, K., Akagi, T., Anthony, P.L., Antonov, R., 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., Comptour, C., Coulter, K.P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F.S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K.A., Hoibraten, S., Hughes, E.W., HydeWright, C., Johnson, J.R., Kawall, D.K., Klein, A., Kuhn, S.E., Kuriki, M., Lindgren, R., Liu, T.J., Lombard-Nelsen, R.M., Marroncle. J., Maruyama, T., Maruyama, X.K., McCarthy, J., Meyer, W., Meziani, Z.-E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G.G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L.S., Rock, S.E., Rondon, O.A., Sick, I., Smith, L.C., Smith, T.B., Spengos, M., Staley, F., Steiner, P., St. Lorant, S., 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., Zihlmann, B., Zimmermann, D., E143 Collaboration, Naval Postgraduate School (U.S.), and Physics

Abstract

We have measured the ratio (gi) /F(gi) over the range 0.029 ( x ( 0.8 and 1.3 (Q+/- ( 10 (GeV/c) using deep-inelastic scattering of polarized electrons from polarized ammonia. An evaluation of the integral fo g+/_ (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 Aq = 0.27 +/- 0.10. This work was supported by Department of Energy Contracts No. DE-AC05-84ER40150 (CEBAF), No. W-2795-Eng-48 (LLNL), No. DE-AC0376SF00515 (SLAC), No. DE-FG03-88ER40439 (Stanford), No. DE-FG05-88ER40390 and No. DEFG05-86ER4026 (Virginia), and No. DE-AC02-76ER00881 (Wisconsin); by National Science Foundation Grants No. 9114958 (American), No. 9307710 (Massachusetts), No. 9217979 (Michigan), No. 9104975 (ODU) and No. 9118137 (U. Penn.); by the Schweizersche Nationalfonds (Basel); by the Commonwealth of Virginia (Virginia); by the Centre NAtional de la Recherche Scientifique and the Commissariat a l'Energie Atomique (French groups); and by the Japanese Ministry of Education, Science and Culture (Tohoku).

Published
1995

34. Precision measurement of the deuteron spin structure function $g^{d}_{1}$

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K. A., Hoeibraten, S., Hughes, E. W., Hyde-Wright, C., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L., Rock, S. E., Rondon, O. A., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., White, J. L., Witte, K., Young, C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

We report on a high-statistics measurement of the deuteron spin structure function g[sup d][sub 1] at a beam energy of 29 GeV in the kinematic range 0.029 < x < 0.8 and 1 < Q2 < 10 (GeV/c)2. The integral Gamma [sup d][sub 1] = (integral)[sup 1][sub 0]g[sup d][sub 1]dx evaluated at fixed Q2 = 3 (GeV/c)2 gives 0.042 ± 0.003(stat) ± 0.004(syst). Combining this result with our earlier measurement of g[sup p][sub 1], we find Gamma [sup p][sub 1]- Gamma [sup n][sub 1] = 0.163 ± 0.010(stat) ± 0.016(syst), which agrees with the prediction of the Bjorken sum rule with O( alpha [sup 3][sub s]) corrections, Gamma [sup p][sub 1]- Gamma [sup n][sub 1] = 0.171 ± 0.008. We find the quark contribution to the proton helicity to be Delta q = 0.30 ± 0.06.

Published
1995

35. 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

36. Precision Measurement of the Proton Spin Structure Function g1p

Author

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., and Naval Postgraduate School (U.S.)

Abstract

The article of record may be found at https://doi.org/10.1103/PhysRevLett.74.346 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

37. Measurements of the proton elastic form factors for 1≤Q^2≤3 (GeV/c)^2 at SLAC

Author

Walker, R. C., Filippone, B. W., Jourdan, J., Milner, R., McKeown, R., Potterveld, D., Andivahis, L., Arnold, R., Benton, D., Bosted, P., deChambrier, G., Lung, A., Rock, S. E., Szalata, Z. M., Para, A., Dietrich, F., Van Bibber, K., Button-Shafer, J., Debebe, B., Hicks, R. S., Dasu, S., de Barbaro, P., Bodek, A., Harada, H., Krasny, M. W., Lang, K., Riordan, E. M., Gearhart, R., Whitlow, L. W., and Alster, J.

Subjects
Caltech Library Services
Abstract

We report measurements of the proton form factors GEp and GMp extracted from elastic scattering in the range 1≤Q^2≤3 (GeV/c)^2 with total uncertainties < 15% in GEp and < 3% in GMp. Comparisons are made to theoretical models, including those based on perturbative QCD, vector-meson dominance, QCD sum rules, and diquark constituents in the proton. The results for GEp are somewhat larger than indicated by most theoretical parametrizations, and the ratios of the Pauli and Dirac form factors Q^2(F2p / F1p) are lower in value and demonstrate a weaker Q^2 dependence than those predictions. A global extraction of the elastic form factors from several experiments in the range 0.1 0.1

Published
1994

38. Measurements of nucleon spin structure at SLAC in end station A

Author

Arnold, R., Bosted, P., Dunne, J., Fellbaum, J., Rock, S., Reyna, D., Szalata, Z., White, J., Feltham, A., Fritschi, D., Jourdan, J., Masson, G., Robinson, S., Sick, I., Steiner, P., Gomez, J., Mitchell, J., Nanda, S., Borel, H., Lombard-Nelson, R., Marroncle, J., Staley, F., Terrien, Y., Bertin, P.Y., BRETON, Vincent, Fonvieille, H., Degtyarenko, P., Shuvalov, S., Dietrich, F., Bauer, J., Button-Shafer, J., Elouadrhiri, L., Hicks, R., Miskimen, R., Peterson, G., Wang, K., Chupp, T., Hyde-Wright, C., Klein, A., Kuhn, S., Anthony, P., Clendenin, J., Dutz, H., Erbacher, R., Gearhart, R., Hughes, E., Murayama, T., Meyer, W., Pitthan, R., Prescott, C., Rochester, L., Stuart, L.M., Tang, Hao, Walz, D., Witte, K., Young, C., Decowski, P., Abe, K., Akagi, T., Suekane, F., Yuta, H., Averett, T., Cothran, C., Crabb, D., Day, D., Frlez, E., Gladyshev, R., Hoeibraten, S., Lindgren, R., Liu, T., Lourie, R., McCarthy, J., McKee, P., Minehart, R., Pocanic, D., Rondon-Aramayo, O., Smith, C., VanVerst, S., Griffioen, K., Antonov, R., Raines, P., Band, H., Johnson, J., Prepost, R., Zapalac, G., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1994

40. Nuclear spin structure measurements at SLAC

Author

Arnold, R., Bosted, P., Dunne, J., Rock, S., Szalata, Z., White, J., Fritschi, D., Jourdan, J., Masson, G., Robinson, S., Sick, I., Gomez, J., Mougey, J., Nanda, S., Thompson, A., Anthony, P., Dietrich, F., Mugge, M., Bibber, K., Button-Shafer, J., Chupp, T., Hicks, K., Vincent Breton, Fonvieille, H., Benton, D., Griffioen, K., Bodek, A., Barbaro, P., Sakumoto, W., Walker, R., Borel, H., Lombard, R., Marroncle, J., Morgenstern, J., Staley, F., Terrien, Y., Atwood, W., Clendenin, J., Fieguth, T., Gearhart, R., Hughes, E., Maruyama, T., Meyer, W., Moffeit, K., Odian, A., Petratos, G., Prescott, C., Rochester, L., Usher, T., Woods, M., Young, C., Kawall, D., Kuhn, S., Meziani, Z., Lichtenstadt, J., Baghaei, H., Jie Chen, Crabb, D., Day, D., Keeter, K., Lindgren, R., Lourie, R., Marshall, R., Mccarthy, J., Minehart, R., Mitchell, J., Norum, B., Pocanic, D., Rondon-Aramayo, O., Smith, C., Verst, S., Band, H., Johnson, J., Prepost, R., Zapalac, G., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Sinha B. Viyogi Y.P. Raha S., and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1993

41. A proposal for a precision measurement of the neutron spin structure function using a polarized $^3$He target

Author

Arnold, R., Bosted, P., Rock, S., White, J., Szalata, Z., BRETON, Vincent, Fonvieille, H., Roblin, Y., Fuzesy, R., Pripstein, D., Shapiro, G., Borel, H., Lombard-Nelson, R., Marroncle, J., Staley, F., Terrien, Y., Anderson, B.D., Madey, R., Manley, D.M., Petratos, G.G., Watson, J.W., Dietrich, F.S., Chupp, T., Coulter, K., Smith, T., Thompson, A.K., Kuhn, S., Cates, G.D., Kumar, K., Middleton, H., Anthony, P., Dutz, H., Gearhart, R., Hughes, E., Kawall, D., Murayama, T., Meyer, W., Pitthan, R., Rokni, S.H., Stuart, L.M., Woods, M., Young, C., Holmes, R., Souder, P.A., Xu, J., Auerbach, L., Margulies, J., Martoff, J., Meziani, Z.E., Band, H., Johnson, J., Prepost, R., Zapalac, G., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E154

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1993

42. The NE11 experiment at SLAC and the neutron form factors

Author

Stuart, L M, Lung, A, Bosted, P E, Andivahis, L, Alster, J, Arnold, R G, Chang, C C, Dietrich, F S, Dodge, W R, Gearhart, R A, Gómez, J, Griffioen, K A, Hicks, R S, Hyde-Wright, C E, Keppel, C E, Kuhn, S E, Lichtenstadt, J, Miskimen, R A, Peterson, G A, Petratos, G G, Rock, S E, Rokni, S H, Sakumoto, W K, Spengos, M, Swartz, K L, Szalata, Z M, and Tao, L H

Subjects
Particle Physics - Experiment
Published
1993

43. Measurements of the nucleon spin structure at SLAC in end station A

Author

Arnold, R.G., Bosted, P., Dunne, J., Rock, Stephen., Szalata, Z.M., White, J.T., Fritzschi, D., Jourdan, J., Masson, G., Robinson, S., Sick, I., Gomez, J., Mougey, J., Nanda, S., Thompson, A., Anthony, P., Dietrich, F., Mugge, M., van Bibber, K., Button-Shafer, J., Chupp, T., Hicks, K., Breton, Vincent, Fonvieille, H., Benton, D., Griffioen, K., Bodek, A., de Barbaro, P., Sakumoto, W., Walker, R.C., Borel, H., Lombard, R.M., Marroncle, J., Morgenstern, J., Staley, F., Terrien, Y., Atwood, W.B., Clendenin, J.E., Fieguth, T.H., Gearhart, R., Hughes, E.B., Maruyama, T., Meyer, W.T., Moffeit, K.C., Odian, A., Petratos, G., Prescott, C.Y., Rochester, L.S., Usher, T., Woods, M., Young, C., Kawall, D., Kuhn, S., Meziani, Z.E., Lichtenstadt, J., Baghaei, H., Chen, Jie, Crabb, D., Day, D., Keeter, K., Lindgren, R., Lourie, R., Marshall, R., Mccarthy, J.S., Minehart, R., Mitchell, J., Norum, B.E., Pocanic, D., Rondon-Aramayo, O., Smith, C., van Verst, S., Band, H., Johnson, J.R., Prepost, R., Zapalac, G., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1992

44. π−nuclear capture ratio on hydrogen and oxygen in water

Author

Berridge, S., primary, Bugg, W., additional, Efremenko, Yu., additional, Gearhart, R., additional, Ovchinnikov, S., additional, Awes, T. C., additional, Cianciolo, V., additional, Davydov, Yu. I., additional, Numao, T., additional, and Poutissou, J-M., additional

Published
2007
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45. Electron calibration on a high-energy cosmic ray detector.

Author

Crannell, C. J, Gearhart, R. A, Hagen, F. A, Jones, W. V, Kurz, R. J, Ormes, J. F, Price, R. D, Silverberg, R. F, and Simnett, G. M

Subjects
Instrumentation And Photography
Abstract

The response of the GSFC High Energy Cosmic Ray Detector has been studied using electrons in the energy range from 5.4 to 18 GeV. A semiempirical analytic form has been developed to determine the starting points and the energies of electron-induced cascade showers. The energy resolution thus obtained has a full width at half maximum of 17%, and the starting point can be determined to within 0.1 to 0.2 radiation length. The results of this response calibration provide a basis on which cosmic ray electrons can be reliably identified and analyzed in the presence of a large proton background.

Published
1973

46. Electron calibration of a high energy cosmic ray detector

Author

Simnett, G. M, Silverberg, R. F, Crannell, C. J, Gearhart, R. A, Hagen, F. A, Jones, W. V, Kurz, R. J, Ormes, J. F, and Price, R. D

Subjects
Instrumentation And Photography
Abstract

The spectrum of cosmic ray electrons above 10 GeV was studied extensively. The spectrum is predicted to steepen at an energy which is related to the lifetime of electrons in the interstellar medium against losses due to inverse Compton collisions with photons and to synchrotron radiation in galactic magnetic fields. The experimental results diverge widely; the lack of agreement between the various measurements is due to a variety of experimental problems.

Published
1972

47. Generation of hard x rays from transition radiation using high-density foils and moderate-energy electrons

Author

Piestrup, M.A., Moran, M. J., Boyers, D.G., Pincus, C. I., Kephart, J. O., Gearhart, R. A., Maruyama, X.K., Naval Postgraduate School (U.S.), and Physics

Abstract

In experiments using target consisting of many thin metal foils, we have demonstrated that a narrow, forward-directed cone of transition radiation in the 8- to 60-keV spectral range can be generated by electrons beams with moderate energies (between 100 and 500 MeV). The theory suggests that high-density, moderate-atomic-number metals are the optimum foil materials and that the foil thickness can be chosen to maximize photon production within a desired spectral range. The three targets in the experiments consisted of 10 foils of 1-um-thick gold, 40 foils of 8.5-um stainless steel, and 20 foils of 7.9-um copper. The efficiency with which hard x rays are generated, and the fact that the requisite electron-beam energies are lower by a factor of 5 to 10, make such a radiation source an attractive alternative to synchrotron radiation for applications such as medical imaging, spectroscopy, and microscopy. This work was financed by the National Science Foundation of the Small Business Innovative Research (SBIR) program, Grant No. PHY-8460914 This work was financed by the National Science Foundation of the Small Business Innovative Research (SBIR) program, Grant No. PHY-8460914

Published
1991

48. Tau-charm factory design

Author

Barish, B C, Allen, M, Barklow, Timothy L, Bell, R, Brau, J E, Brown, K, Bunnell, K O, Burnett, T H, Cook, V, Cowan, R, Coward, D H, Eisenstein, B I, Faust, D, Fero, M J, Frey, R, Fryberger, D, Gan, K K, Gearhart, R A, Gladding, G E, Gómez-Cadenas, J J, Heusch, C A, Izen, J M, Jenkins, T, Johnson, R, Kirkby, Jasper, Lisin, A V, Lockman, W, Loew, G A, Meadows, B, Miller, R, Mir, R, Mockett, P M, Morton, P, Munger, C T, Nussbaum, M, Odian, A C, Paterson, J M, Perl, Martin Lewis, Ruth, Ronald D, Schindler, R, Seiden, A, Servranckx, R V, Sokoloff, M D, Saint-Lorant, S J, Stockdale, I E, Stroynowski, R, Thaler, J J, Thompson, K, Toki, W, Villa, F, Weidner, H, Weinstein, A, and Yamamoto, R

Subjects
Particle Physics
Published
1990

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