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1. Precision Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetries A2

Author

SLAC E155 Collaboration, Anthony, P. L., Arnold, R. G., and Averett, T.

Subjects
High Energy Physics - Experiment
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., Comment: 12 pages, 4 figures, 2 tables

Published
2002
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2. Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetry A2

Author

E155 Collaboration, Anthony, P. L., and Arnold, R. G.

Subjects
High Energy Physics - Experiment
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 1.0 < Q^2 < 30(GeV/c)^2 by scattering 38.8 GeV longitudinally polarized electrons from transversely polarized NH3 and 6LiD targets.The absolute value of A2 is significantly smaller than the sqrt{R} positivity limit over the measured range, while g2 is consistent with the twist-2 Wandzura-Wilczek calculation. We obtain results for the twist-3 reduced matrix elements d2p, d2d and d2n. The Burkhardt-Cottingham sum rule integral - int(g2(x)dx) is reported for the range 0.02 < x < 0.8., Comment: 12 pages, 4 figures, 1 table

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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7. 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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8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. Feasibility investigation of a cellularly organized data processor

Author

Minnick, R. C, Jump, J. R, Arnold, R. G, and Beirne, J. M

Subjects
Computers
Abstract

The application of cellular arrays to NASA missions was studied. Cellular arrays are iterative logical and memory structures which can be programmed to accomplish a wide variety of logical tasks. Used in long-duration space missions, spare cellular arrays can be remotely programmed to replace faulty logical subsystems as the need arises.

Published
1972

15. Exclusive Electron Scattering from Deuterium at High Momentum Transfer

Author

Bulten, H. J., Anthony, P. L., Arnold, R. G., Arrington, J., Beise, E. J., Belz, E., Van Bibber, K., Bosted, P. E., van den Brand, J. F. J., Chapman, M. S., Coulter, K. P., Dietrich, F. S., 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., Kuhn, S. E., 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., White, J. L., Zeidman, B., Bulten, H. J., Anthony, P. L., Arnold, R. G., Arrington, J., Beise, E. J., Belz, E., Van Bibber, K., Bosted, P. E., van den Brand, J. F. J., Chapman, M. S., Coulter, K. P., Dietrich, F. S., 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., Kuhn, S. E., 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., White, J. L., and Zeidman, B.

Abstract

Cross sections are presented for the reaction 2H(e,e′p)n for momentum transfers in the range 1.2≤Q^2≤6.8 (GeV/c)^2 and for missing momenta from 0 to 250 MeV/c. The longitudinal-transverse interference structure function has been separated at Q^2 = 1.2 (GeV/c)^2. The observables are compared to calculations performed in nonrelativistic and relativistic frameworks. The data are best described by a fully relativistic calculation.

Published
1995

16. 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

17. Microstrip Discontinuity Models to 60 GHz

Author

PLESSEY RESEARCH (CASWELL) LTD TOWCESTER (UNITED KINGDOM), Arnold, R. G., Jansen, R. H., Weimer, L., PLESSEY RESEARCH (CASWELL) LTD TOWCESTER (UNITED KINGDOM), Arnold, R. G., Jansen, R. H., and Weimer, L.

Abstract

A new modeling concept, in which discontinuities are coupled to package modes, has been formulated. Analytical expressions describing the electrical behavior of various gallium arsenide microstrip discontinuities for frequencies up to 60 GHz are derived. These are suitable for use in Computer Aided Design (CAD) of Monolithic Microwave and Millimeter Wave Integrated Circuits (MMICs). The discontinuities modelled are the Open End, Gap, 90 degree Bend and T-Junction. A physics related modeling approach was used to obtain equivalent circuits representing the microstrip and first package LSM mode and their interaction at the discontinuity. The main section explains the modeling approach undertaken and provides a description of the discontinuity models. An appendix provides details of a 3-D full wave analysis method based on a spectral operator expansion technique. This was used to check numerical results needed for the modeling. (Author), No software available for this document.

Published
1991

25. Distributed Data Processing Technology. Volume VII. Application of DDP Technology to BMD: Experiments.

Author

HONEYWELL INC MINNEAPOLIS MINN SYSTEMS AND RESEARCH CENTER, Arnold,R G, Boebert,W E, Jensen,E D, Marshall,G D, Utt,W K, HONEYWELL INC MINNEAPOLIS MINN SYSTEMS AND RESEARCH CENTER, Arnold,R G, Boebert,W E, Jensen,E D, Marshall,G D, and Utt,W K

Abstract

Critical issues from other volumes are reviewed and experiments and case studies are recommended to resolve these issues. Results of one architecture simulation experiment are discussed. An experiment facility for DDP for the ARC at BMDATC and required hardware and software to support the proposed experiments are presented. (Author), Prepared in cooperation with General Research Corp., Santa Barbara, CA. See also Volume 8, AD-A047 479.

Published
1977

26. Measurement of the neutron spin structure function $g_{2}^{n}$ and asymmetry $a_{2}^{n}$

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., Vincent Breton, Buenerd, M., Cates, G. D., Chupp, T. E., Churchwell, S., Coulter, K. P., Daoudi, M., Decowski, P., Erickson, R., Fellbaum, J., Fonvieille, H., Gearhart, R., Ghazikhanian, V., Griffioen, K. A., Hicks, R. S., Holmes, R., Hughes, E. W., Igo, G., Incerti, S., Johnson, J. R., Kahl, W., Khayat, M., Kolomensky, Yu G., Kuhn, S. E., Kumar, K., Kuriki, M., Lombard-Nelsen, R. M., Manley, D. M., Marroncle, J., Maruyama, T., Marvin, T., Meyer, W., Meziani, Z. E., Miller, R., Mitchell, G., Olson, M., Peterson, G. A., Petratos, G. G., Pitthan, R., Prepost, R., Raines, P., Raue, B., Reyna, D., Rochester, L., Rock, S. E., Romalis, M. V., Sabatie, F., Shapiro, G., Shaw, J., Smith, T. B., Sorrell, L., Souder, P. A., Staley, F., 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., Wright, T., Young, 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), 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), E154, and 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)

Subjects
High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, High Energy Physics - Experiment
Abstract

We have measured the neutron structure function g$_{2}^{n}$ and the virtual photon-nucleon asymmetry A$_{2}^{n}$ over the kinematic range $0.014\leq x \leq 0.7$ and $1.0 \leq Q^{2} \leq 17.0$ by scattering 48.3 GeV longitudinally polarized electrons from polarized $^{3}$He. Results for A$_{2}^{n}$ are significantly smaller than the $\sqrt{R}$ positivity limit over most of the measured range and data for g$_2^{n}$ are generally consistent with the twist-2 Wandzura-Wilczek prediction. Using our measured g$_{2}^{n}$ we obtain results for the twist-3 reduced matrix element $d_{2}^{n}$, and the integral $\int$g$_{2}^{n}(x)dx$ in the range $0.014\leq x \leq 1.0$. Data from this experiment are combined with existing data for g$_{2}^{n}$ to obtain an average for $d_{2}^{n}$ and the integral $\int$g$_{2}^{n}(x)dx$., Comment: 10 pages, 3 figures. To be published in Physics Letters B

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31. Isolation of copper biochelates from Methylosinus trichosporium OB3b and soluble methane monooxygenase mutants.

Author

Téllez CM, Gaus KP, Graham DW, Arnold RG, and Guzman RZ

Subjects
Chromatography, High Pressure Liquid, Molecular Weight, Mutation, Chelating Agents isolation & purification, Copper metabolism, Methylococcaceae metabolism, Oxygenases metabolism
Abstract

Methylosinus trichosporium OB3b produces an extracellular copper-binding ligand (CBL) with high affinity for copper. Wild-type cells and mutants that express soluble methane monooxygenase (sMMO) in the presence and absence of copper (sMMOc) were used to obtain cell exudates that were separated and analyzed by size exclusion high-performance liquid chromatography. A single chromatographic peak, when present, contained most of the aqueous-phase Cu(II) present in the culture medium. In mutant cultures that were unable to acquire copper, extracellular CBL accumulated to high levels both in the presence and in the absence of copper. Conversely, in wild-type cultures containing 5 microM Cu(II), extracellular CBL was maintained at a low, steady level during exponential growth, after which the external ligand was rapidly consumed. When Cu(II) was omitted from the growth medium, the wild-type organism produced the CBL at a rate that was proportional to cell density. After copper was added to this previously Cu-deprived culture, the CBL and copper concentrations in the medium decreased at approximately the same rate. Apparently, the extracellular CBL was produced throughout the period of cell growth, in the presence and absence of Cu(II), by both the mutant and wild-type cultures and was reinternalized or otherwise utilized by the wild-type cultures when it was bound to copper. CBL produced by the mutant strain facilitated copper uptake by wild-type cells, indicating that the extracellular CBLs produced by the mutant and wild-type organisms are functionally indistinguishable. CBL from the wild-type strain did not promote copper uptake by the mutant. The molecular weight of the CBL was estimated to be 500, and its association constant with copper was 1.4 x 10(16) M-1. CBL exhibited a preference for copper, even in the presence of 20-fold higher concentrations of nickel. External complexation may play a role in normal copper acquisition by M. trichosporium OB3b. The sMMOc phenotype is probably related to the mutant's inability to take up CBL-complexed copper, not to a defective CBL structure.

Published
1998
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32. Factors affecting competition between type I and type II methanotrophs in two-organism, continuous-flow reactors.

Author

Graham DW, Chaudhary JA, Hanson RS, and Arnold RG

Abstract

Competition experiments were performed in a continuous-flow reactor using Methylosinus trichosporium OB3b, a type II methanotroph, and Methylomonas albus BG8, a type I methanotroph. The experiments were designed to establish conditions under which type II methanotrophs, which have significant cometabolic potential, prevail over type I strains. The primary determinants of species selection were dissolved methane, copper, and nitrate concentrations. Dissolved oxygen and methanol concentrations played secondary roles. M. trichosporium OB3b proved dominant under copper and nitratelimited conditions. The ratio of M. trichosporium to M. albus in the reactor increased ten-fold in less than 100 hours following the removal of copper from the reactor feed. Numbers of M. albus declined to levels that were below detection limits (<106/ml) under nitrogen-limited conditions. In the latter experiment, the competitive success of M. trichosporiumdepended on the maintenance of an ambient dissolved oxygen level below about 7.5 × 10(-5) M, or 30% of saturation with air. The ability of M. trichosporium to express soluble methane monooxygenase under copper limitation and nitrogenase under nitrate limitation was very significant. M. albus predominated under methane-limited conditions, especially when low levels of methanol were simultaneously added with methane to the reactor. The results imply that nitrogen limitation can be used to select for type II strains such as M. trichosporium OB3b.

Published
1993
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33. Regulation of Dissimilatory Fe(III) Reduction Activity in Shewanella putrefaciens.

Author

Arnold RG, Hoffmann MR, Dichristina TJ, and Picardal FW

Abstract

Under anaerobic conditions, Shewanella putrefaciens is capable of respiratory-chain-linked, high-rate dissimilatory iron reduction via both a constitutive and inducible Fe(III)-reducing system. In the presence of low levels of dissolved oxygen, however, iron reduction by this microorganism is extremely slow. Fe(II)-trapping experiments in which Fe(III) and O(2) were presented simultaneously to batch cultures of S. putrefaciens indicated that autoxidation of Fe(II) was not responsible for the absence of Fe(III) reduction. Inhibition of cytochrome oxidase with CN resulted in a high rate of Fe(III) reduction in the presence of dissolved O(2), which suggested that respiratory control mechanisms did not involve inhibition of Fe(III) reductase activities or Fe(III) transport by molecular oxygen. Decreasing the intracellular ATP concentrations by using an uncoupler, 2,4-dinitrophenol, did not increase Fe(III) reduction, indicating that the reduction rate was not controlled by the energy status of the cell. Control of electron transport at branch points could account for the observed pattern of respiration in the presence of the competing electron acceptors Fe(III) and O(2).

Published
1990
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34. A Test to Determine Microquantities of Milkfat in Cleaning Solutions by Surface Film Displacement 1 .

Author

Maxcy RB and Arnold RG

Abstract

Determining microquantities of soil is a major challenge in evaluating cleaning systems. A highly sensitive test was therefore developed to determine trace quantities of milkfat in cleaning solutions. It involved extraction of cleaning solution with organic solvents and subsequent determination of surface film displacement. The area displaced was directly related to the quantity of milkfat in the test solution with a correlation coefficient of 0.99. Usefulness of the test in evaluating cleaning systems has been shown in other research.

Published
1978
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