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1. Threshold electrodisintegration of 3He

Author

Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA, Laboratory of Nuclear Science, Tohoku University, Sendai 982-0826, Japan, Institute of Physics, Jagellonian University, PL-30059 Kraców, Poland, MIT-Bates Linear Accelerator Center, Middleton, Massachusetts 01949, USA, Department of Physics, University of Virginia, Charlottesville, Virginia 22901, USA, Institut für Theoretische Physik II, Ruhr Universität Bochum, D-44780 Bochum, Germany, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, College of Radiology, Teikyo University, Tokyo 173-8605, Japan, Department of Physics, University of Arizona, Tucson, Arizona 85721, USA, Hicks, R.S., Hotta, A, Churchwell, S, Jiang, X, Peterson, G.A, Shaw, J, Asavapibhop, B, Berisso, M.C., Bosted, P.E., Burchesky, P.E, Miskimen, R.A, Rock, S.E, Nakagawa, I, Tamae, T, Suda, T, Golak, J, Skibinski, R, Witala, H, Casagrande, F, Turchinetz, W, Cichocki, A, Wang, K, Glockle, W, Kamada, Hiroyuki, Kobayashi, T, Nogga, A, Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA, Laboratory of Nuclear Science, Tohoku University, Sendai 982-0826, Japan, Institute of Physics, Jagellonian University, PL-30059 Kraców, Poland, MIT-Bates Linear Accelerator Center, Middleton, Massachusetts 01949, USA, Department of Physics, University of Virginia, Charlottesville, Virginia 22901, USA, Institut für Theoretische Physik II, Ruhr Universität Bochum, D-44780 Bochum, Germany, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, College of Radiology, Teikyo University, Tokyo 173-8605, Japan, Department of Physics, University of Arizona, Tucson, Arizona 85721, USA, Hicks, R.S., Hotta, A, Churchwell, S, Jiang, X, Peterson, G.A, Shaw, J, Asavapibhop, B, Berisso, M.C., Bosted, P.E., Burchesky, P.E, Miskimen, R.A, Rock, S.E, Nakagawa, I, Tamae, T, Suda, T, Golak, J, Skibinski, R, Witala, H, Casagrande, F, Turchinetz, W, Cichocki, A, Wang, K, Glockle, W, Kamada, Hiroyuki, Kobayashi, T, and Nogga, A

Abstract

type:Journal Article, Cross sections were measured for the near-threshold electrodisintegration of 3He at momentum transfer values of q=2.4, 4.4, and 4.7 fm-1. From these and prior measurements the transverse and longitudinal response functions RT and RL were deduced. Comparisons are made against previously published and new nonrelativistic A=3 calculations using the best available nucleon-nucleon NN potentials. In general, for q<2 fm-1 these calculations accurately predict the threshold electrodisintegration of 3He. Agreement at increasing q demands consideration of two-body terms, but discrepancies still appear at the highest momentum transfers probed, perhaps due to the neglect of relativistic dynamics, or to the underestimation of high-momentum wave-function components., source:http://link.aps.org/abstract/PRC/v67/e064004, source:http://www.aps.org

Published
2017

2. A-dependence of nuclear transparency in quasielastic A(e, ef'p) at high 2

Author

ONEILL, T.G., LORENZON, W., ANTHONY, P., ARNOLD, R.G., ARRINGTON, J., 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., LUNG, A., MAKINS, N.C.R., MARGAZIOTIS, D.J., MCKEOWN, R.D., MILNER, R.G., MUELLER, B., NAPOLITANO, J., NELSON, J., PAPAVASSILIOU, V., PETRATOS, G.G., POTTERVELD, D.H., ROCK, S.E., SPENGOS, M., SZALATA, Z.M., TAO, L.H., VANBIBBER, K., Van den Brand, J.F.J., WHITE, J.L., and ZEIDMAN, B.

Subjects
Nuclear and High Energy Physics, Particle physics, Proton, MOMENTUM-TRANSFER, FOS: Physical sciences, 01 natural sciences, Measure (mathematics), COLOR TRANSPARENCY, Nuclear physics, High Energy Physics - Phenomenology (hep-ph), E,E''P REACTION, 0103 physical sciences, medicine, 010306 general physics, E''P REACTION, DENSITY-DISTRIBUTION, Physics, Momentum (technical analysis), 010308 nuclear & particles physics, Momentum transfer, IMPULSE APPROXIMATION, ANGLE, MODEL, High Energy Physics - Phenomenology, medicine.anatomical_structure, Nuclear transparency, Color transparency, PROTON PROPAGATION, MESON, ELASTIC ELECTRON-SCATTERING, Nucleus
Abstract

The A-dependence of the quasielastic A(e,e'p) reaction has been studied at SLAC with H-2, C, Fe, and Au nuclei at momentum transfers Q^2 = 1, 3, 5, and 6.8 (GeV/c)^2. We extract the nuclear transparency T(A,Q^2), a measure of the average probability that the struck proton escapes from the nucleus A without interaction. Several calculations predict a significant increase in T with momentum transfer, a phenomenon known as Color Transparency. No significant rise within errors is seen for any of the nuclei studied., Comment: 5 pages incl. 2 figures, Caltech preprint OAP-731

Published
1995
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3. Threshold Electrodisintegration of ^3He

Author

Hicks, R.S., Hotta, A, Churchwell, S, Jiang, X, Peterson, G.A, Shaw, J, Asavapibhop, B, Berisso, M.C., Bosted, P.E., Burchesky, P.E, Miskimen, R.A, Rock, S.E, Nakagawa, I, Tamae, T, Suda, T, Golak, J, Skibinski, R, Witala, H, Casagrande, F, Turchinetz, W, Cichocki, A, Wang, K, Glockle, W, Kamada, Hiroyuki, Kobayashi, T, and Nogga, A

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Cross sections were measured for the near-threshold electrodisintegration of ^3He at momentum transfer values of q=2.4, 4.4, and 4.7 fm^{-1}. From these and prior measurements the transverse and longitudinal response functions R_T and R_L were deduced. Comparisons are made against previously published and new non-relativistic A=3 calculations using the best available NN potentials. In general, for q, 9 pages, 7 figures, 1 table, REVTEX4, submitted to Physical Review C

Published
2003
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4. 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

5. 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

6. 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

7. 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

8. 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

9. Quasielastic (e,e′p) reaction on 12C,56Fe, and 197Au

Author

Dutta, D., Dutta, D., van Westrum, D., Abbott, D., Ahmidouch, A., Amatuni, A., Armstrong, C., Arrington, J., Assamagan, K.A., Bailey, K., Baker, O.K., Barrow, S., Beard, K., Beatty, D., Beedoe, S., Beise, E., Belz, E., Bochna, C., Bosted, P.E., Breuer, H., Bruins, E.E.W., Carlini, R., Cha, J., Chant, N., Cothran, C., Cummings, W.J., Danagoulian, S., Day, D., DeSchepper, D., Ducret, J.-E., Duncan, F., Dunne, J., Eden, T., Ent, R., Fortune, H.T., Frolov, V., Geesaman, D.F., Gao, H., Gilman, R., Gueye, P., Hansen, J.O., Hinton, W., Holt, R.J., Jackson, C., Jackson, H.E., Jones, C., Kaufman, S., Kelly, J.J., Keppel, C., Khandaker, M., Kim, W., Kinney, A., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., Lung, A., McFarlane, K., Mack, D.J., Madey, R., Markowitz, P., Martin, J., Mateos, A., Meekins, D., Miller, M.A., Milner, R., Mitchell, J., Mohring, R., Mkrtchyan, H., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Potterveld, D., Price, J.W., Reinhold, J., Salgado, C., Schiffer, J.P., Segel, R.E., Stoler, P., Suleiman, R., Tadevosyan, V., Tang, L., Terburg, B., Welch, T.P., Williamson, C., Wood, S., Yan, C., Yang, J.-C., Yu, J., Zeidman, B., Zhao, W., Zihlmann, B., Dutta, D., Dutta, D., van Westrum, D., Abbott, D., Ahmidouch, A., Amatuni, A., Armstrong, C., Arrington, J., Assamagan, K.A., Bailey, K., Baker, O.K., Barrow, S., Beard, K., Beatty, D., Beedoe, S., Beise, E., Belz, E., Bochna, C., Bosted, P.E., Breuer, H., Bruins, E.E.W., Carlini, R., Cha, J., Chant, N., Cothran, C., Cummings, W.J., Danagoulian, S., Day, D., DeSchepper, D., Ducret, J.-E., Duncan, F., Dunne, J., Eden, T., Ent, R., Fortune, H.T., Frolov, V., Geesaman, D.F., Gao, H., Gilman, R., Gueye, P., Hansen, J.O., Hinton, W., Holt, R.J., Jackson, C., Jackson, H.E., Jones, C., Kaufman, S., Kelly, J.J., Keppel, C., Khandaker, M., Kim, W., Kinney, A., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., Lung, A., McFarlane, K., Mack, D.J., Madey, R., Markowitz, P., Martin, J., Mateos, A., Meekins, D., Miller, M.A., Milner, R., Mitchell, J., Mohring, R., Mkrtchyan, H., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Potterveld, D., Price, J.W., Reinhold, J., Salgado, C., Schiffer, J.P., Segel, R.E., Stoler, P., Suleiman, R., Tadevosyan, V., Tang, L., Terburg, B., Welch, T.P., Williamson, C., Wood, S., Yan, C., Yang, J.-C., Yu, J., Zeidman, B., Zhao, W., and Zihlmann, B.

Abstract

We report the results from a systematic study of the quasielastic (e,e′p) reaction on 12C, 56Fe, and 197Au performed at Jefferson Lab. We have measured nuclear transparency and extracted spectral functions (corrected for radiation) over a Q2 range of 0.64–3.25 (GeV∕c)2 for all three nuclei. In addition, we have extracted separated longitudinal and transverse spectral functions at Q2 of 0.64 and 1.8 (GeV∕c)2 for these three nuclei (except for 197Au at the higher Q2). The spectral functions are compared to a number of theoretical calculations. The measured spectral functions differ in detail but not in overall shape from most of the theoretical models. In all three targets the measured spectral functions show considerable excess transverse strength at Q2=0.64 (GeV∕c)2, which is much reduced at 1.8 (GeV∕c)2.

Published
2003

10. Separated spectral functions for the quasifree 12C(e,e′p) reaction

Author

Dutta, D., Dutta, D., van Westrum, D., Abbott, D., Ahmidouch, A., Amatuni, A., Armstrong, C., Arrington, J., Assamagan, K.A., Bailey, K., Baker, O.K., Barrow, S., Beard, K., Beatty, D., Beedoe, S., Beise, E., Belz, E., Bochna, C., Bosted, P.E., Breuer, H., Bruins, E.E.W., Carlini, R., Cha, J., Chant, N., Chrien, R.E., Cothran, C., Cummings, W.J., Danagoulian, S., Day, D., DeSchepper, D., Ducret, J.-E., Duncan, F., Dunne, J., Eden, T., Ent, R., Fortune, H.T., Frolov, V., Geesaman, D.F., Gao, H., Gilman, R., Gue`ye, P., Hansen, J.O., Hinton, W., Holt, R.J., Jackson, C., Jackson, H.E., Jones, C., Kaufman, S., Kelly, J.J., Keppel, C., Khandaker, M., Kim, W., Kinney, E., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., McFarlane, K., Mack, D.J., Madey, R., Markowitz, P., Martin, J., Mateos, A., Meekins, D., Meier, E., Miller, M.A., Milner, R., Mitchell, J., Mohring, R., Mkrtchyan, H., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Potterveld, D., Price, J.W., Reinhold, J., Salgado, C., Schiffer, J.P., Segel, R.E., Stoler, P., Suleiman, R., Sawafta, R., Sutter, R.J., Tadevosyan, V., Tang, L., Terburg, B., Welch, T.P., Williamson, C., Wood, S., Yan, C., Jae-Choon, Yang, Yu, J., Zeidman, B., Zhao, W., Zihlmann, B., Dutta, D., Dutta, D., van Westrum, D., Abbott, D., Ahmidouch, A., Amatuni, A., Armstrong, C., Arrington, J., Assamagan, K.A., Bailey, K., Baker, O.K., Barrow, S., Beard, K., Beatty, D., Beedoe, S., Beise, E., Belz, E., Bochna, C., Bosted, P.E., Breuer, H., Bruins, E.E.W., Carlini, R., Cha, J., Chant, N., Chrien, R.E., Cothran, C., Cummings, W.J., Danagoulian, S., Day, D., DeSchepper, D., Ducret, J.-E., Duncan, F., Dunne, J., Eden, T., Ent, R., Fortune, H.T., Frolov, V., Geesaman, D.F., Gao, H., Gilman, R., Gue`ye, P., Hansen, J.O., Hinton, W., Holt, R.J., Jackson, C., Jackson, H.E., Jones, C., Kaufman, S., Kelly, J.J., Keppel, C., Khandaker, M., Kim, W., Kinney, E., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., McFarlane, K., Mack, D.J., Madey, R., Markowitz, P., Martin, J., Mateos, A., Meekins, D., Meier, E., Miller, M.A., Milner, R., Mitchell, J., Mohring, R., Mkrtchyan, H., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Potterveld, D., Price, J.W., Reinhold, J., Salgado, C., Schiffer, J.P., Segel, R.E., Stoler, P., Suleiman, R., Sawafta, R., Sutter, R.J., Tadevosyan, V., Tang, L., Terburg, B., Welch, T.P., Williamson, C., Wood, S., Yan, C., Jae-Choon, Yang, Yu, J., Zeidman, B., Zhao, W., and Zihlmann, B.

Abstract

A separation of the longitudinal and transverse 12C(e,e′p) cross sections in the quasifree region has been performed in parallel kinematics at Q2 of 0.64 and 1.8 GeV2 for initial proton momentum <80 MeV. The separated transverse and longitudinal spectral functions at Q2=0.64GeV2 show significant differences for missing energy between 25 and 60 MeV indicating a breakdown in the single nucleon knockout picture. The transverse spectral functions exhibit definite momentum transfer dependence.

Published
2000

11. Coherent π0 photoproduction on the deuteron up to 4 GeV

Author

Meekins, D.G., Meekins, D.G., Abbott, D.J., Ahmidouch, A., Armstrong, C.S., Arrington, J., Assamagan, K.A., Baker, O.K., Barrow, S.P., Beatty, D.P., Beck, D.H., Beedoe, S.Y., Beise, E.J., Belz, J.E., Bochna, C., Bosted, P.E., Brash, E.J., Breuer, H., Cadman, R.V., Cardman, L., Carlini, R.D., Cha, J., Chant, N.S., Collins, G., Cothran, C., Cummings, W.J., Danagoulian, S., Duncan, F.A., Dunne, J.A., Dutta, D., Eden, T., Ent, R., Filippone, B.W., Forest, T.A., Fortune, H.T., Frolov, V.V., Gao, H., Geesaman, D.F., Gilman, R., Gueye, P.L.J., Gustafsson, K.K., Hansen, J.-O., Harvey, M., Hinton, W., Holt, R.J., Jackson, H.E., Keppel, C.E., Khandaker, M.A., Kinney, E.R., Klein, A., Koltenuk, D.M., Kumbartzki, G., Lung, A.F., Mack, D.J., Madey, R., Markowitz, P., McFarlane, K.W., McKeown, R.D., Meziani, Z.-E., Miller, M.A., Mitchell, J.H., Mkrtchyan, H.G., Mohring, R.M., Napolitano, J., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Owen, B.R., Pate, S.F., Potterveld, D.H., Price, J.W., Rakness, G.L., Ransome, D., Reinhold, J., Rutt, P.M, Salgado, C.W., Savage, G., Segel, R.E., Simicevic, N., Stoler, P., Suleiman, R., Tang, L., Terburg, B.P., van Westrum, D., Vulcan, W.F., Williamson, S.E., Witkowski, M.T., Wood, S.A., Yan, C., Zeidman, B., Meekins, D.G., Meekins, D.G., Abbott, D.J., Ahmidouch, A., Armstrong, C.S., Arrington, J., Assamagan, K.A., Baker, O.K., Barrow, S.P., Beatty, D.P., Beck, D.H., Beedoe, S.Y., Beise, E.J., Belz, J.E., Bochna, C., Bosted, P.E., Brash, E.J., Breuer, H., Cadman, R.V., Cardman, L., Carlini, R.D., Cha, J., Chant, N.S., Collins, G., Cothran, C., Cummings, W.J., Danagoulian, S., Duncan, F.A., Dunne, J.A., Dutta, D., Eden, T., Ent, R., Filippone, B.W., Forest, T.A., Fortune, H.T., Frolov, V.V., Gao, H., Geesaman, D.F., Gilman, R., Gueye, P.L.J., Gustafsson, K.K., Hansen, J.-O., Harvey, M., Hinton, W., Holt, R.J., Jackson, H.E., Keppel, C.E., Khandaker, M.A., Kinney, E.R., Klein, A., Koltenuk, D.M., Kumbartzki, G., Lung, A.F., Mack, D.J., Madey, R., Markowitz, P., McFarlane, K.W., McKeown, R.D., Meziani, Z.-E., Miller, M.A., Mitchell, J.H., Mkrtchyan, H.G., Mohring, R.M., Napolitano, J., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Owen, B.R., Pate, S.F., Potterveld, D.H., Price, J.W., Rakness, G.L., Ransome, D., Reinhold, J., Rutt, P.M, Salgado, C.W., Savage, G., Segel, R.E., Simicevic, N., Stoler, P., Suleiman, R., Tang, L., Terburg, B.P., van Westrum, D., Vulcan, W.F., Williamson, S.E., Witkowski, M.T., Wood, S.A., Yan, C., and Zeidman, B.

Abstract

The differential cross section for 2H(γ,d)π0 has been measured at deuteron center-of-mass angles of 90° and 136°. This work reports the first data for this reaction above a photon energy of 1 GeV, and permits a test of the apparent constituent counting rule and reduced nuclear amplitude behavior as observed in elastic ed scattering. Measurements were performed up to a photon energy of 4.0 GeV, and are in good agreement with previous lower energy measurements. Overall, the data are inconsistent with both constituent-counting rule and reduced nuclear amplitude predictions.

Published
1999

12. Measurements of Deuteron Photodisintegration up to 4.0 GeV

Author

Bochna, C., Bochna, C., Terburg, B.P., Abbott, D.J., Ahmidouch, A., Armstrong, C.S., Arrington, J., Assamagan, K.A., Baker, O.K., Barrow, S.P., Beatty, D.P., Beck, D.H., Beedoe, S.Y., Beise, E.J., Belz, J.E., Bosted, P.E., Brash, E.J., Breuer, H., Cadman, R.V., Cardman, L., Carlini, R.D., Cha, J., Chant, N.S., Collins, G., Cothran, C., Cummings, W.J., Danagoulian, S., Duncan, F.A., Dunne, J.A., Dutta, D., Eden, T., Ent, R., Filippone, B.W., Forest, T.A., Fortune, H.T., Frolov, V.V., Gao, H., Geesaman, D.F., Gilman, R., Gueye, P.L.J., Gustafsson, K.K., Hansen, J.-O., Harvey, M., Hinton, W., Holt, R.J., Jackson, H.E., Keppel, C.E., Khandaker, M.A., Kinney, E.R., Klein, A., Koltenuk, D.M., Kumbartzki, G., Lung, A.F., Mack, D.J., Madey, R., Markwoitz, P., McFarlane, K.W., McKeown, R.D., Meekins, D.G., Meziani, Z.-E., Miller, M.A., Mitchell, J.H., Mkrtchyan, H.G., Mohring, R.M., Napolitano, J., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Owen, B.R., Pate, S.F., Potterveld, D.H., Price, J.W., Rakness, G.L., Ransome, R., Reinhold, J., Rutt, P.M., Salgado, C.W., Savage, G., Segel, R., Simicevic, N., Stoler, P., Suleiman, R., Tang, L., van Westrum, D., Vulcan, W.F., Williamson, S., Witkowski, M.T., Wood, S.A., Yan, C., Zeidman, B., Bochna, C., Bochna, C., Terburg, B.P., Abbott, D.J., Ahmidouch, A., Armstrong, C.S., Arrington, J., Assamagan, K.A., Baker, O.K., Barrow, S.P., Beatty, D.P., Beck, D.H., Beedoe, S.Y., Beise, E.J., Belz, J.E., Bosted, P.E., Brash, E.J., Breuer, H., Cadman, R.V., Cardman, L., Carlini, R.D., Cha, J., Chant, N.S., Collins, G., Cothran, C., Cummings, W.J., Danagoulian, S., Duncan, F.A., Dunne, J.A., Dutta, D., Eden, T., Ent, R., Filippone, B.W., Forest, T.A., Fortune, H.T., Frolov, V.V., Gao, H., Geesaman, D.F., Gilman, R., Gueye, P.L.J., Gustafsson, K.K., Hansen, J.-O., Harvey, M., Hinton, W., Holt, R.J., Jackson, H.E., Keppel, C.E., Khandaker, M.A., Kinney, E.R., Klein, A., Koltenuk, D.M., Kumbartzki, G., Lung, A.F., Mack, D.J., Madey, R., Markwoitz, P., McFarlane, K.W., McKeown, R.D., Meekins, D.G., Meziani, Z.-E., Miller, M.A., Mitchell, J.H., Mkrtchyan, H.G., Mohring, R.M., Napolitano, J., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Owen, B.R., Pate, S.F., Potterveld, D.H., Price, J.W., Rakness, G.L., Ransome, R., Reinhold, J., Rutt, P.M., Salgado, C.W., Savage, G., Segel, R., Simicevic, N., Stoler, P., Suleiman, R., Tang, L., van Westrum, D., Vulcan, W.F., Williamson, S., Witkowski, M.T., Wood, S.A., Yan, C., and Zeidman, B.

Abstract

The first measurements of the differential cross section for the d(γ,p)n reaction up to 4.0 GeV were performed at the Continuous Electron Beam Accelerator Facility (CEBAF) at Thomas Jefferson Laboratory. We report the cross sections at the proton center-of-mass angles of 36°, 52°, 69°, and 89°. These results are in reasonable agreement with previous measurements at lower energy. The 89° and 69° data show constituent-counting-rule behavior up to 4.0 GeV photon energy. The 52° and 36° data disagree with the counting-rule behavior. The quantum chromodynamics (QCD) model of nuclear reactions involving reduced amplitudes disagrees with the present data.

Published
1998

13. Inclusive electron scattering from nuclei at x≃1

Author

Arrington, J., 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., van Bibber, K., van den Brand, J.F.J., White, J.L., Winter, D., Zeidman, B., Arrington, J., 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., van Bibber, K., van den Brand, J.F.J., White, J.L., Winter, D., and Zeidman, B.

Abstract

The inclusive A(e,e′) cross section for x≃1 was measured on 2H, C, Fe, and Au for momentum transfers Q2 from 1 to 6.8 (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 ξ scaling, reminiscent of the Bloom-Gilman duality seen in free nucleon scattering.

Published
1996

14. 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.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.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., van Bibber, K., van den Brand, J.F.J., White, J.L., Winter, D., Zeidman, B., 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.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.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., van Bibber, K., van den Brand, J.F.J., White, J.L., Winter, D., and Zeidman, B.

Abstract

The inclusive A(e,e′) cross section for x≃1 was measured on

Published
1996
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15. Two-Body Photodisintegration of the Deuteron up to 2.8 GeV

Author

Belz, J.E., Belz, J.E., Potterveld, D.H., Anthony, P., Arnold, R.G., Arrington, J., Beck, D., Beise, E.J., 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., Makins, N.C.R., Lung, A., Margaziotis, D.J., McKeown, R.D., Meziani, Z.E., Milner, R.G., Mueller, B., Napolitano, J., Nelson, J., O'Neill, T.G., Papavassiliou, V., Petratos, G.G., Rock, S.E., Segel, R.E., Spengos, M., Szalta, Z.M., Tao, L.H., van Bibber, K., van der Brand, F.J., White, J.L., Zeidman, B., Belz, J.E., Belz, J.E., Potterveld, D.H., Anthony, P., Arnold, R.G., Arrington, J., Beck, D., Beise, E.J., 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., Makins, N.C.R., Lung, A., Margaziotis, D.J., McKeown, R.D., Meziani, Z.E., Milner, R.G., Mueller, B., Napolitano, J., Nelson, J., O'Neill, T.G., Papavassiliou, V., Petratos, G.G., Rock, S.E., Segel, R.E., Spengos, M., Szalta, Z.M., Tao, L.H., van Bibber, K., van der Brand, F.J., White, J.L., and Zeidman, B.

Abstract

Measurements were performed for the photodisintegration cross section of the deuteron for photon energies from 1.6 to 2.8 GeV and center-of-mass angles from 37° to 90°. The measured energy dependence of the cross section at θc.m.=90° is in agreement with the constituent counting rules.

Published
1995

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

Author

Naval Postgraduate School (U.S.), Physics, 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.), Physics, 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., and E143 Collaboration

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.

Published
1995

17. Precision measurement of the deuteron spin structure function gd1

Author

Naval Postgraduate School (U.S.), Physics, 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.), Physics, 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., and E143 Collaboration

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.

Published
1995

18. Evidence for virtual Compton scattering from the proton

Author

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

Abstract

In virtual Compton scattering an electron is scattered off a nucleon such that the nucleon emits a photon. We show that these events can be selected experimentally, and present the first evidence for virtual Compton scattering from the proton in data obtained at the Stanford Linear Accelerator Center. The angular and energy dependence of the data is well described by a calculation that includes the coherent sum of electron and proton radiation.

Published
1995

19. Exclusive Electron Scattering from Deuterium at High Momentum Transfer

Author

Bulten, H.J., 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., 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., Rock, S.E., Spengos, M., Szalata, Z.M., Tao, L.H., White, J.L., Zeidman, B., Bulten, H.J., 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., 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., 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≤Q2≤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 Q2 = 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

20. Momentum transfer dependence of nuclear transparency from the quasielastic 12C(e,e’p) reaction

Author

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

Abstract

The cross section for quasielastic 12C(e,e’p) scattering has been measured at momentum transfer Q2=1, 3, 5, and 6.8 (GeV/c)2. The results are consistent with scattering from a single nucleon as the dominant process. The nuclear transparency is obtained and compared with theoretical calculations that incorporate color transparency effects. No significant rise of the transparency with Q2 is observed.

Published
1994

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