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142 results on '"C. E. Hyde-Wright"'

101. Hyperon Photoproduction in the Nucleon Resonance Region

Author: G. E. Dodge, Jing Zhao, W. Kim, M. Bellis, K. Park, S. McAleer, P. V. Degtyarenko, K. Kim, R. Miskimen, J. Yun, R. Fatemi, R. J. Feuerbach, Bernhard Mecking, K. V. Dharmawardane, Hovanes Egiyan, A. V. Vlassov, J. Lachniet, I. Niculescu, D. Rowntree, G. Riccardi, D. Lawrence, R. DeVita, J. W C McNabb, J. W. Price, A. Empl, O. Pogorelko, K. Lukashin, A. Coleman, H. R. Weller, G. Ricco, R. S. Hakobyan, F. W. Hersman, M. Bektasoglu, A. V. Skabelin, G. S. Mutchler, J. J. Manak, Hall Crannell, K. A. Griffioen, G. Gavalian, V. Sapunenko, Valeria Muccifora, S. A. Philips, P. Heimberg, Philip L. Cole, B. E. Bonner, B. M. Preedom, S. A. Morrow, Shalev Gilad, P. Stoler, H. Avakian, K. S. Egiyan, L. C. Smith, G. V. O'Rielly, Gerard Gilfoyle, S. J. Gaff, Baile Zhang, J. J. Melone, K. Mikhailov, David Jenkins, P. Eugenio, Friedrich Klein, R. A. Schumacher, R. S. Hicks, M. Battaglieri, I. I. Strakovsky, C. Marchand, M. Taiuti, K. Sabourov, W. J. Briscoe, B. P. Quinn, S. A. Dytman, C. I O Gordon, D. I. Sober, W. K. Brooks, S. Taylor, M. Osipenko, J. P. Cummings, E. De Sanctis, C. S. Whisnant, J. P. Santoro, L. Morand, K. Y. Kim, T. A. Forest, D. Branford, R. A. Niyazov, M. Ripani, K. Beard, John T. O'Brien, R. Bradford, S. Stepanyan, M. Mirazita, J. M. Laget, L.C. Dennis, Cynthia Marie Hadjidakis, H. Bagdasaryan, P. Corvisiero, Chaden Djalali, M. Kossov, M. M. Ito, H. Denizli, Kalvir S. Dhuga, A. Weisberg, Sylvain Bouchigny, K. Wang, Avraham Klein, Volker D. Burkert, Federico Ronchetti, C. Butuceanu, Michael Dugger, Y. Kuang, A. S. Biselli, H. O. Funsten, K.H. Hicks, G. S. Adams, M. Guillo, C. Salgado, Patrick Girard, J. Shaw, Rakhsha Nasseripour, K. Joo, S. Strauch, B. B. Niczyporuk, E. Polli, V. Gyurjyan, A. D. Cords, S. O. Nelson, Dinko Pocanic, Michael Wood, U. Thoma, N. Pivnyuk, J. R. Calarco, V. S. Serov, S. E. Kuhn, J. Napolitano, S. Mehrabyan, Ji Li, J. H. Kelley, C. Tur, M. D. Mestayer, Laird Kramer, Alexei V. Klimenko, Elton Smith, B. A. Raue, J. R. Ficenec, Roy Thompson, Barry Ritchie, M. Anghinolfi, E. Wolin, S. Boiarinov, James Mueller, P. D. Rubin, Y. G. Sharabian, J. P. Ball, Y. Prok, M. Eckhause, Latifa Elouadrhiri, R. C. Minehart, C. A. Meyer, C. Cetina, Michael Vineyard, D. G. Crabb, D. P. Weygand, A. Yegneswaran, P. Dragovitsch, S. Niccolai, J. Hardie, A.V. Stavinsky, J. S. McCarthy, J. Hu, B. Carnahan, F. Sabatié, Thierry Auger, B. L. Berman, L. M. Qin, M. Klusman, D. Doughty, D. Heddle, L. Ciciani, Y. Ilieva, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, M. Spraker, Larry Weinstein, Nicola Bianchi, E. Anciant, L. Todor, D. Protopopescu, S. Pozdniakov, Z. L. Zhou, A. Shafi, M. Khandaker, G. A. Peterson, S. Barrow, P. Rossi, E. Pasyuk, D. J. Tedeschi, M. Guidal, G. Niculescu, M. Holtrop, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Nozar, L. Guo, and M. Ungaro
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Hyperon, FOS: Physical sciences, Lambda, Lambda baryon, High Energy Physics - Experiment, Sigma baryon, Baryon, Nuclear physics, High Energy Physics - Experiment (hep-ex), Recoil, PHOTON ENERGIES, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nucleon
Abstract: Cross-sections and recoil polarizations for the reactions gamma + p --> K^+ + Lambda and gamma + p --> K^+ + Sigma^0 have been measured with high statistics and with good angular coverage for center-of-mass energies between 1.6 and 2.3 GeV. In the K^+Lambda channel we confirm a structure near W=1.9 GeV at backward kaon angles, but our data shows a more complex s- and u- channel resonance structure than previously seen. This structure is present at forward and backward angles but not central angles, and its position and width change with angle, indicating that more than one resonance is playing a role. Rising back-angle cross sections at higher energies and large positive polarization at backward angles are consistent with sizable s- or u-channel contributions. None of the model calculations we present can consistently explain these aspects of the data., 5 pages, 3 figures, submitted to Physical Review Letters
Published: 2003
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102. The CEBAF large acceptance spectrometer (CLAS)

Author: B. L. Berman, L. M. Qin, D. Doughty, D. Heddle, M. Klusman, R. C. Minehart, R. J. Feuerbach, P.F. Yergin, D. Tilles, R. A. Schumacher, S. Stepanyan, Avraham Klein, W.S. Duncan, R. Magahiz, J. W. Price, D. J. Tedeschi, C. Riggs, M. Guidal, G. Asryan, Federico Ronchetti, H. Avakian, F. Barbosa, A. Yegneswaran, G. E. Dodge, A. Lake, Thierry Auger, A. K. Opper, P. V. Degtyarenko, I. Niculescu, John T. O'Brien, D. Lawrence, G. Ricco, M. Holtrop, Thomas E. Smith, D. Joyce, W.M. Taylor, Hall Crannell, M. Kossov, E. Golovatch, S. A. Dytman, P. Corvisiero, K. Beard, Philip L. Cole, W. Kim, V. Muccifora, L. Elouadrhiri, N. Bianchi, Barry Ritchie, Robert E. Welsh, J.E. O'Meara, W. Tuzel, Friedrich Klein, R. S. Hicks, A. Coleman, A. Longhi, E. Polli, V. Gyurjyan, M. Witkowski, Bernhard Mecking, Elton Smith, D. I. Sober, W. K. Brooks, J. Gram, E. DeSanctis, V. S. Serov, J. Lachniet, M. Taiuti, M. Anghinolfi, R. Miskimen, V. Frolov, J. Ficenec, James Mueller, M. Battaglieri, D. Kashy, F. Roudot, Y. G. Sharabian, R. DeVita, J. W C McNabb, K. L. Giovanetti, B. Asavapibhop, J. Distelbrink, Larry Weinstein, E. Anciant, L.C. Dennis, S. Taylor, M. M. Ito, J. Connelly, P. Bonneau, C. Martin, G.R. Wilkin, G. S. Adams, Daniel S. Carman, L. C. Smith, J. Yun, D. Cords, G. Audit, David Jenkins, C. E. Hyde-Wright, P. Hemler, S. E. Kuhn, K. Joo, Jim Napolitano, Roy Thompson, G. Riccardi, M. Ripani, A. V. Vlassov, C. Marchand, B. A. Raue, M. Nozar, B. B. Niczyporuk, H. Egiyan, E. Pasyuk, W. J. Briscoe, D. Insley, U. Thoma, Michael Dugger, D. P. Weygand, H. O. Funsten, K. Lukashin, W. R. Dodge, E. Wolin, J. J. Manak, T. Carstens, S. Ahmad, A.V. Stavinsky, G. Jacobs, C. Salgado, J. P. Ball, W. Major, D. G. Crabb, G. Doolittle, L. Y. Murphy, K. S. Egiyan, V. Koubarovski, T.Y. Tung, M. Khandaker, M. Mirazita, S. Barrow, P. Rossi, L. Todor, S. Pozdniakov, M. D. Mestayer, F. W. Hersman, S. Boiarinov, V. Sapunenko, Gerard Gilfoyle, R.C. Cuevas, S. K. Matthews, C. Cetina, Michael Vineyard, S.B. Christo, J. Robb, K.H. Hicks, Laird Kramer, Volker D. Burkert, G. S. Mutchler, M. McMullen, S. A. Philips, and P. Stoler
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Spectrometer, Meson, Particle accelerator, Particle identification, law.invention, Nuclear physics, law, Carbon–fluorine bond, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Instrumentation, Cherenkov radiation
Abstract: The CEBAF large acceptance spectrometer (CLAS) is used to study photo- and electro-induced nuclear and hadronic reactions by providing efficient detection of neutral and charged particles over a good fraction of the full solid angle. A collaboration of about 30 institutions has designed, assembled, and commissioned CLAS in Hall B at the Thomas Jefferson National Accelerator Facility. The CLAS detector is based on a novel six-coil toroidal magnet which provides a largely azimuthal field distribution. Trajectory reconstruction using drift chambers results in a momentum resolution of 0.5% at forward angles. Cherenkov counters, time-of-flight scintillators, and electromagnetic calorimeters provide good particle identification. Fast triggering and high data-acquisition rates allow operation at a luminosity of 10 34 nucleon cm −2 s −1 . These capabilities are being used in a broad experimental program to study the structure and interactions of mesons, nucleons, and nuclei using polarized and unpolarized electron and photon beams and targets. This paper is a comprehensive and general description of the design, construction and performance of CLAS.
Published: 2003

103. Measurement of inclusive spin structure functions of the deuteron

Author: J. Yun, S. E. Kuhn, G. E. Dodge, T. A. Forest, M. Taiuti, G. S. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, W. Bertozzi, N. Bianchi, A. S. Biselli, S. Boiarinov, P. Bosted, S. Bouchigny, R. Bradford, D. Branford, W. K. Brooks, S. Bueltmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, L. Ciciani, P. L. Cole, A. Coleman, J. Connelly, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. Cummings, E. De Sanctis, R. De Vita, P. V. Degtyarenko, R. A. Demirchyan, H. Denizli, L. C. Dennis, K. V. Dharmawardane, C. Djalali, J. Domingo, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, Y. V. Efremenko, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, L. Farhi, R. Fatemi, R. J. Feuerbach, J. Ficenec, K. Fissum, A. Freyberger, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, G. Gavalian, V. B. Gavrilov, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, E. Golovatch, C. I. O. Gordon, K. A. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, M. M. Ito, D. Jenkins, K. Joo, C. Keith, J. H. Kelley, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, J. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, G. A. Leksin, K. Loukachine, R. W. Major, J. J. Manak, C. Marchand, S. McAleer, J. W. C. McNabb, J. McCarthy, B. A. Mecking, M. D. Mestayer, C. A. Meyer, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, S. Morrow, V. Muccifora, J. Mueller, L. Y. Murphy, G. S. Mutchler, J. Napolitano, S. O. Nelson, S. Niccolai, G. Niculescu, B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O’Rielly, M. S. Ohandjanyan, A. Opper, M. Ossipenko, K. Park, Y. Patois, G. A. Peterson, S. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, S. Rock, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, K. Sabourov, C. W. Salgado, V. Sapunenko, M. Sargsyan, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, S. M. Shuvalov, S. Simionatto, A. Skabelin, E. S. Smith, L. C. Smith, T. Smith, D. I. Sober, L. Sorrell, M. Spraker, S. Stepanyan, P. Stoler, S. Taylor, D. Tedeschi, U. Thoma, R. Thompson, L. Todor, T. Y. Tung, C. Tur, M. F. Vineyard, A. Vlassov, K. Wang, L. B. Weinstein, H. Weller, R. Welsh, D. P. Weygand, S. Whisnant, M. Witkowski, E. Wolin, M. H. Wood, A. Yegneswaran, B. Zhang, J. Zhao, Z. Zhou, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, and Robert, Suzanne
Subjects: Physics, Nuclear and High Energy Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, FOS: Physical sciences, Spin structure, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Deuterium, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: We report the results of a new measurement of spin structure functions of the deuteron in the region of moderate momentum transfer ($Q^2$ = 0.27 -- 1.3 (GeV/c)$^2$) and final hadronic state mass in the nucleon resonance region ($W$ = 1.08 -- 2.0 GeV). We scattered a 2.5 GeV polarized continuous electron beam at Jefferson Lab off a dynamically polarized cryogenic solid state target ($^{15}$ND$_3$) and detected the scattered electrons with the CEBAF Large Acceptance Spectrometer (CLAS). From our data, we extract the longitudinal double spin asymmetry $A_{||}$ and the spin structure function $g_1^d$. Our data are generally in reasonable agreement with existing data from SLAC where they overlap, and they represent a substantial improvement in statistical precision. We compare our results with expectations for resonance asymmetries and extrapolated deep inelastic scaling results. Finally, we evaluate the first moment of the structure function $g_1^d$ and study its approach to both the deep inelastic limit at large $Q^2$ and to the Gerasimov-Drell-Hearn sum rule at the real photon limit ($Q^2 \to 0$). We find that the first moment varies rapidly in the $Q^2$ range of our experiment and crosses zero at $Q^2$ between 0.5 and 0.8 (GeV/c)$^2$, indicating the importance of the $\Delta$ resonance at these momentum transfers., Comment: 13 pages, 8 figures, ReVTeX 4, final version as accepted by Phys. Rev. C
Published: 2003

104. First measurement of transferred polarization in the exclusive ep--e'K+Lambda--reaction

Author: D S, Carman, K, Joo, M D, Mestayer, B A, Raue, G, Adams, P, Ambrozewicz, E, Anciant, M, Anghinolfi, D S, Armstrong, B, Asavapibhop, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S P, Barrow, M, Battaglieri, K, Beard, M, Bektasoglu, M, Bellis, C, Bennhold, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, S, Bouchigny, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, V D, Burkert, C, Butuceanu, J R, Calarco, B, Carnahan, A, Cazes, C, Cetina, L, Ciciani, R, Clark, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, DeSanctis, P V, Degtyarenko, H, Denizli, L, Dennis, R, DeVita, K V, Dharmawardane, K S, Dhuga, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, O P, Dzyubak, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, P, Eugenio, R, Fatemi, G, Fedotov, R J, Feuerbach, J, Ficenec, T A, Forest, H, Funsten, S J, Gaff, M, Gai, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, E, Golovach, C I O, Gordon, K, Griffioen, S, Grimes, M, Guidal, M, Guillo, L, Guo, V, Gyurjyan, C, Hadjidakis, R S, Hakobyan, J, Hardie, D, Heddle, P, Heimberg, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, B, Ishkhanov, M M, Ito, D, Jenkins, J H, Kelley, J D, Kellie, M, Khandaker, K Y, Kim, K, Kim, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Kuhn, J, Lachniet, J M, Laget, D, Lawrence, J, Li, K, Livingston, A, Longhi, K, Lukashin, J J, Manak, C, Marchand, T, Mart, S, McAleer, J, McCarthy, J W C, McNabb, B A, Mecking, S, Mehrabyan, J J, Melone, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mokeev, L, Morand, S A, Morrow, M U, Mozer, V, Muccifora, J, Mueller, L Y, Murphy, G S, Mutchler, J, Napolitano, R, Nasseripour, S O, Nelson, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, M, Nozar, G V, O'Rielly, A K, Opper, M, Osipenko, K, Park, K, Paschke, E, Pasyuk, G, Peterson, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P, Rubin, F, Sabatié, K, Sabourov, C, Salgado, J, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, J, Shaw, S, Simionatto, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, M, Taiuti, S, Taylor, D J, Tedeschi, U, Thoma, R, Thompson, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, L B, Weinstein, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M H, Wood, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The first measurements of the transferred polarization for the exclusive e--p--e(')K+Lambda--reaction have been performed at Jefferson Laboratory using the CLAS spectrometer. A 2.567 GeV beam was used to measure the hyperon polarization over Q2 from 0.3 to 1.5 (GeV/c)(2), W from 1.6 to 2.15 GeV, and over the full K+ center-of-mass angular range. Comparison with predictions of hadrodynamic models indicates strong sensitivity to the underlying resonance contributions. A nonrelativistic quark-model interpretation of our data suggests that the ssmacr; quark pair is produced with spins predominantly antialigned. Implications for the validity of the most widely used quark-pair creation operator are discussed.
Published: 2002

105. Publisher’s Note:ηPhotoproduction on the Proton for Photon Energies from 0.75 to 1.95 GeV [Phys. Rev. Lett.89, 222002 (2002)]

Author: V. V. Frolov, D. Doughty, R. A. Niyazov, John T. O'Brien, D. Heddle, Barry Ritchie, S. A. Morrow, P. Rubin, M. Eckhause, C. Djalali, P. Dragovitsch, K. A. Griffioen, G. E. Dodge, M. Lucas, P. Corvisiero, D. Hancock, E. S. Smith, Sylvain Bouchigny, P. Rossi, P. V. Degtyarenko, S. Niccolai, Carlos A. Salgado, L. Elouadrhiri, G. Ricco, J. Hardie, K. S. Egiyan, Baile Zhang, R. C. Minehart, C. A. Meyer, G. S. Mutchler, V. Koubarovski, K. Mikhailov, G. Gavalian, A. K. Opper, I. Niculescu, M. M. Ito, I. I. Strakovsky, A.V. Stavinsky, D. Lawrence, M. Spraker, C. Cetina, H. Egiyan, G. V. O'Rielly, E. Wolin, Michael Vineyard, J. P. Cummings, D. P. Weygand, L. Farhi, Y. Kuang, D. J. Tedeschi, C. S. Whisnant, D. G. Jenkins, K. Sabourov, G. P. Capitani, E. Polli, William Brooks, G. S. Adams, R. DeVita, J. W C McNabb, Ji Li, H. Denizli, Hall Crannell, M. U. Mozer, P. Heimberg, M. Witkowski, K. V. Dharmawardane, A. Coleman, P. L. Cole, Cynthia Marie Hadjidakis, Andreas Klein, J. R. Ficenec, S. McAleer, J. D. Kellie, P. Stoler, J. Lachniet, H. R. Weller, M. Kossov, J. R. Calarco, C. Marchand, M. D. Mestayer, J. J. Manak, D. Rowntree, M. Anghinolfi, James Mueller, Michael Dugger, J. Connelly, A. V. Skabelin, K. S. Dhuga, D. Pogorelko, H. O. Funsten, S. O. Nelson, Y. G. Sharabian, Frank Klein, L. C. Smith, Rakhsha Nasseripour, S. J. Gaff, K. Hicks, M. Sanzone-Arenhovel, R. A. Schumacher, S. Boiarinov, B. B. Niczyporuk, B. M. Preedom, S. Strauch, S. A. Philips, W. Kim, N. Pivnyuk, C. I O Gordon, K. Lukashin, J. Napolitano, Moshe Gai, Dinko Pocanic, M. Battaglieri, Shalev Gilad, M. Nozar, S. E. Kuhn, L. Morand, T. A. Forest, B. Carnahan, F. Sabatié, K. L. Giovanetti, B. Asavapibhop, J. H. Kelley, Stephen Taylor, J. P. Ball, Y. Prok, Patrick Girard, R. Bradford, B. A. Mecking, Larry Weinstein, Gerald Feldman, J. Shaw, S. Stepanyan, D. S. Carman, Jens H. Kuhn, A. Longhi, E. Anciant, K. Wang, U. Thoma, Nicola Bianchi, Thierry Auger, Michael Wood, R. S. Hicks, Brian Raue, K. Livingston, V. S. Serov, L. C. Dennis, M. Khandaker, G. Audit, M. Ripani, M. Guillo, C. E. Hyde-Wright, B. L. Berman, L. M. Qin, H. Avakian, R. J. Feuerbach, K. Beard, M. Klusman, D. G. Crabb, G. A. Peterson, W. Major, M. Bektasoglu, S. Barrow, M. Guidal, G. Niculescu, W. J. Briscoe, E. Pasyuk, Federico Ronchetti, M. Holtrop, Thomas E. Smith, S. A. Dytman, L. Todor, J. S. McCarthy, M. Bellis, D. Protopopescu, L. Y. Murphy, S. Pozdniakov, S. Mehrabyan, Z. L. Zhou, R. Clark, A. Shafi, G. Riccardi, J. P. Santoro, Roy Thompson, Jing Zhao, M. Taiuti, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, F. W. Hersman, R. A. Miskimen, D. Branford, M. Mirazita, J. M. Laget, Laird Kramer, R. Fatemi, A. V. Vlassov, K. Park, D. I. Sober, Volker D. Burkert, A. S. Biselli, L. Guo, M. Ungaro, K. Joo, J. Yun, D. Cords, A. Yegneswaran, E. DeSanctis, V. Gyurjyan, H. Bagdasaryan, and J. W. Price
Subjects: Physics, Nuclear physics, Photon, Proton, General Physics and Astronomy
Published: 2002

106. Measurement of ep--e' ppi+ pi- and baryon resonance analysis

Author: M, Ripani, V D, Burkert, V, Mokeev, M, Battaglieri, R, De Vita, E, Golovach, M, Taiuti, G, Adams, E, Anciant, M, Anghinolfi, B, Asavapibhop, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S, Barrow, K, Beard, M, Bektasoglu, M, Bellis, B L, Berman, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, S, Bouchigny, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, J R, Calarco, D S, Carman, B, Carnahan, A, Cazes, C, Cetina, L, Ciciani, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, De Sanctis, P V, Degtyarenko, H, Denizli, L, Dennis, K V, Dharmawardane, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, R, Fatemi, G, Fedotov, G, Feldman, R J, Feuerbach, J, Ficenec, T A, Forest, H, Funsten, S J, Gaff, M, Gai, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, K, Griffioen, M, Guidal, M, Guillo, L, Guo, V, Gyurjyan, C, Hadjidakis, J, Hardie, D, Heddle, P, Heimberg, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, B, Ishkhanov, M M, Ito, D, Jenkins, K, Joo, J H, Kelley, J D, Kellie, M, Khandaker, K Y, Kim, K, Kim, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Kuhn, J, Lachniet, J M, Laget, D, Lawrence, Ji, Li, K, Livingston, A, Longhi, K, Lukashin, J J, Manak, C, Marchand, S, McAleer, J, McCarthy, J W C, McNabb, B A, Mecking, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, L, Morand, S A, Morrow, M U, Mozer, V, Muccifora, J, Mueller, L Y, Murphy, G S, Mutchler, J, Napolitano, R, Nasseripour, S O, Nelson, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, M, Nozar, G V, O'Rielly, A K, Opper, M, Osipenko, K, Park, E, Pasyuk, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B, Quinn, B A, Raue, G, Riccardi, G, Ricco, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, F, Sabatié, K, Sabourov, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, S, Simionatto, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, I I, Strakovsky, S, Taylor, D J, Tedeschi, U, Thoma, R, Thompson, L, Todor, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, L B, Weinstein, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M H, Wood, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The cross section for the reaction ep--e(')ppi(+)pi(-) was measured in the resonance region for 1.4W2.1 GeV and 0.5Q21.5 GeV(2)/c(2) using the CLAS detector at Jefferson Laboratory. The data show resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on N(*) and Delta states shows an evident discrepancy. A better description of the data is obtained either by a sizable change of the properties of the P13(1720) resonance or by introducing a new baryon state, not reported in published analyses.
Published: 2002

107. Eta photoproduction on the proton for photon energies from 0.75 to 1.95 GeV

Author: R. Fatemi, K. S. Egiyan, V. Koubarovski, A. V. Vlassov, B. Carnahan, F. Sabatié, K. Mikhailov, C. Marchand, M. Taiuti, Thierry Auger, S. A. Morrow, C. Djalali, W. J. Briscoe, E. Pasyuk, M. Lucas, G. Ricco, S. A. Dytman, J. J. Manak, C. E. Hyde-Wright, A.V. Stavinsky, H. R. Weller, Patrick Girard, A. V. Skabelin, G. S. Mutchler, S. Stepanyan, Sylvain Bouchigny, J. Shaw, D. J. Tedeschi, S. McAleer, Philip L. Cole, Moshe Gai, R. A. Niyazov, Michael Wood, B. M. Preedom, V. S. Serov, E. Anciant, J. S. McCarthy, J. P. Santoro, A. K. Opper, M. Sanzone-Arenhovel, John T. O'Brien, D. I. Sober, F. W. Hersman, B. B. Niczyporuk, M. U. Mozer, M. Witkowski, Bernhard Mecking, K. V. Dharmawardane, B. L. Berman, Shalev Gilad, P. Rossi, W. Kim, M. Bellis, K. Park, M. Guillo, Friedrich Klein, P. Corvisiero, H. Egiyan, S. Mehrabyan, M. Khandaker, Gerald Feldman, N. Pivnyuk, J. P. Cummings, J. Napolitano, P. Dragovitsch, M. Ripani, R. S. Hicks, Brian Raue, A. Longhi, R. Clark, Roy Thompson, K. Wang, S. Strauch, C. Salgado, O. Pogorelko, D. Protopopescu, H. Funsten, M. Kossov, K. Lukashin, D. Doughty, D. Heddle, M. Klusman, C. S. Whisnant, S. Pozdniakov, L.C. Dennis, J. R. Calarco, M. M. Ito, L. Todor, J. W. Price, S. Niccolai, J. Hardie, R. J. Feuerbach, Rakhsha Nasseripour, P. Stoler, C. Cetina, S. O. Nelson, R. A. Miskimen, Volker D. Burkert, L. C. Smith, A. S. Biselli, K. Beard, S. J. Gaff, Michael Vineyard, K. A. Griffioen, Kalvir S. Dhuga, L. Y. Murphy, M. Battaglieri, G. Riccardi, R. DeVita, J. W C McNabb, E. Wolin, F. Ronchetti, V. Frolov, Ji Li, G. Gavalian, R. Bradford, Cynthia Marie Hadjidakis, D. Branford, J. Ficenec, J. P. Ball, Y. Prok, P. Heimberg, M. Eckhause, Z. L. Zhou, A. Shafi, G. V. O'Rielly, M. D. Mestayer, Michael Dugger, D. G. Jenkins, K. Sabourov, K. L. Giovanetti, B. Asavapibhop, D. G. Crabb, S. Boiarinov, L. Elouadrhiri, Larry Weinstein, M. Spraker, M. Mirazita, J. M. Laget, J. D. Kellie, I. I. Strakovsky, K. Livingston, Baile Zhang, W. K. Brooks, L. M. Qin, Laird Kramer, L. Farhi, Harut Avakian, V. Sapunenko, Valeria Muccifora, Y. Kuang, G. A. Peterson, E. Polli, Dinko Pocanic, S. Barrow, S. E. Kuhn, J. H. Kelley, Gerard Gilfoyle, Elton Smith, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, Jens H. Kuhn, Jing Zhao, Nicola Bianchi, Barry Ritchie, R. C. Minehart, C. A. Meyer, S. A. Philips, H. Denizli, K. Hicks, Daniel S. Carman, J. Connelly, G. Audit, M. Bektasoglu, M. Nozar, M. Guidal, G. Niculescu, M. Holtrop, Thomas E. Smith, Hall Crannell, G. E. Dodge, P. V. Degtyarenko, I. Niculescu, D. Lawrence, L. Morand, R. A. Schumacher, C. I O Gordon, T. A. Forest, Avraham Klein, V. Gyurjyan, H. Bagdasaryan, D. Hancock, W. Major, E. DeSanctis, G. P. Capitani, L. Guo, M. Ungaro, J. Lachniet, D. Rowntree, S. Taylor, G. S. Adams, K. Joo, J. Yun, A. Coleman, D. Cords, A. Yegneswaran, U. Thoma, and D. P. Weygand
Subjects: Physics, Particle physics, Photon, Meson, Proton, media_common.quotation_subject, Quark model, General Physics and Astronomy, Constituent quark, Resonance (particle physics), Asymmetry, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure), media_common
Abstract: Differential cross sections for gammap-->etap have been measured with tagged real photons for incident photon energies from 0.75 to 1.95 GeV. Mesons were identified by missing mass reconstruction using kinematical information for protons scattered in the production process. The data provide the first extensive angular distribution measurements for the process above W=1.75 GeV. Comparison with preliminary results from a constituent quark model support the suggestion that a third S11 resonance with mass approximately 1.8 GeV couples to the etaN channel.
Published: 2002

108. Erratum: First Measurement of the Double Spin Asymmetry ine→p→→e′π+nin the Resonance Region [Phys. Rev. Lett. 88, 082001 (2002)]

Author: R. De Vita, M. Anghinolfi, V. D. Burkert, G. E. Dodge, R. Minehart, M. Taiuti, H. Weller, G. Adams, M. J. Amaryan, E. Anciant, D. S. Armstrong, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, P. Bosted, S. Bouchigny, D. Branford, W. K. Brooks, S. Bueltmann, J. R. Calarco, G. P. Capitani, D. S. Carman, B. Carnahan, A. Cazes, L. Ciciani, P. L. Cole, A. Coleman, J. Connelly, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. De Sanctis, P. V. Degtyarenko, R. Demirchyan, H. Denizli, L. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, L. Farhi, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, M. Garçon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, E. Golovatch, K. Griffioen, M. Guidal, M. Guillo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, B. S. Ishkanov, M. M. Ito, D. Jenkins, K. Joo, J. H. Kelley, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, J. Kuhn, S. E. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, Ji Li, K. Livingston, A. Longhi, K. Loukachine, M. Lucas, W. Major, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, S. O. Nelson, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, A. K. Opper, G. V. O'Rielly, M. Osipenko, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, S. Rock, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, K. Sabourov, C. Salgado, V. Sapunenko, M. Sargsyan, R. A. Schumacher, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, A. V. Skabelin, E. S. Smith, T. Smith, L. C. Smith, D. I. Sober, L. Sorrell, M. Spraker, A. Stavinsky, S. Stepanyan, P. Stoler, I. I. Strakovsky, S. Taylor, D. J. Tedeschi, R. Thompson, L. Todor, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, A. Weisberg, D. P. Weygand, C. S. Whisnant, E. Wolin, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, and Z. Zhou
Subjects: Physics, media_common.quotation_subject, Pi, General Physics and Astronomy, Resonance, Angular dependence, Atomic physics, Spin (physics), Asymmetry, Helicity, media_common
Published: 2002

109. Q2Dependence of Quadrupole Strength in theγ*p→Δ+(1232)→pπ0Transition

Author: C. Marchand, T. Y. Tung, M. Witkowski, Bernhard Mecking, C. E. Hyde-Wright, K. V. Dharmawardane, M. J. Amaryan, S. Stepanyan, J. Ficenec, Jochen Heisenberg, G. A. Peterson, S. Barrow, K. Y. Kim, S. A. Philips, Jing Zhao, P. Rossi, Patrick Girard, J. Shaw, Nicola Bianchi, G. E. Dodge, G. S. Adams, P. V. Degtyarenko, K. L. Giovanetti, B. Asavapibhop, J. P. Cummings, L. C. Dennis, B. E. Bonner, R. A. Niyazov, M. Guidal, S. McAleer, H. Avakian, G. Niculescu, W. Kim, K. Loukachine, K. Joo, K. A. Griffioen, J. R. Calarco, P. Corvisiero, Z. L. Zhou, Larry Weinstein, R. De Vita, Michael Vineyard, M. Holtrop, Thomas E. Smith, D. Lawrence, Roy Thompson, A. Longhi, R. A. Demirchyan, M. Battaglieri, F. W. Hersman, K. S. Egiyan, William Bertozzi, E. Anciant, M. Kossov, L. Farhi, V. Sapunenko, H. Egiyan, R. A. Schumacher, M. S. Ohandjanyan, D. P. Weygand, Valeria Muccifora, Daniel S. Carman, S. A. Dytman, A. K. Opper, M. Khandaker, M. D. Mestayer, A. Coleman, V. B. Gavrilov, G. Audit, Y. Patois, H. R. Weller, G. Riccardi, Gerard Gilfoyle, J. W C McNabb, M. Taiuti, H. Funsten, M. Klusman, K. Beard, S. Boiarinov, Federico Ronchetti, J. W. Price, D. Doughty, Airton Deppman, S. Whisnant, B. M. Preedom, D. J. Tedeschi, R. A. Miskimen, L. C. Smith, A. V. Skabelin, D. Heddle, P. Stoler, T. A. Forest, R. J. Feuerbach, G. Ricco, G. S. Mutchler, Kalvir S. Dhuga, Kevin Fissum, B. B. Niczyporuk, M. Mirazita, J. M. Laget, O. Pogorelko, Philip L. Cole, B. Carnahan, K. Hicks, N. Pivnyuk, J. Napolitano, Avraham Klein, R. W. Major, Volker D. Burkert, M. Sanzone, A. S. Biselli, S. K. Matthews, G. P. Capitani, Moshe Gai, Shalev Gilad, Thierry Auger, C. Salgado, Friedrich Klein, Inna Aznauryan, C. Djalali, M. Lucas, A. R. Reolon, S. M. Shuvalov, R. S. Hicks, Brian Raue, M. Guillo, D. Rowntree, D. G. Jenkins, L. Elouadrhiri, Hall Crannell, Robert E. Welsh, P. Dragovitsch, M. M. Ito, W. K. Brooks, L. M. Qin, L. Todor, Y. V. Efremenko, S. Taylor, J. Hardie, M. Bektasoglu, A. V. Vlassov, J. J. Manak, E. De Sanctis, D. I. Sober, Barry Ritchie, E. Wolin, Y. Kuang, E. Polli, H. Denizli, Dinko Pocanic, M. Eckhause, M. Sargsyan, S. E. Kuhn, R. C. Minehart, D. G. Crabb, J. H. Kelley, C. A. Meyer, M. Spraker, Michael Dugger, Elton Smith, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, M. Ripani, V. Gyurjyan, H. Bagdasaryan, D. Hancock, D. S. Armstrong, J. Yun, D. Cords, and A. Yegneswaran
Subjects: Quark, Physics, Unitarity, 010308 nuclear & particles physics, Nuclear Theory, Scalar (mathematics), General Physics and Astronomy, 01 natural sciences, Nuclear physics, Baryon, Pion, 0103 physical sciences, Quadrupole, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Multipole expansion
Abstract: Models of baryon structure predict a small quadrupole deformation of the nucleon due to residual tensor forces between quarks or distortions from the pion cloud. Sensitivity to quark versus pion degrees of freedom occurs through the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the gamma*p-->Delta(+)-->p pi(0) transition. We report new experimental values for the ratios E(1+)/M(1+) and S(1+)/M(1+) over the range Q2 = 0.4-1.8 GeV2, extracted from precision p(e,e(')p)pi(0) data using a truncated multipole expansion. Results are best described by recent unitary models in which the pion cloud plays a dominant role.
Published: 2002

110. First Measurement of the Double Spin Asymmetry ine→p→→e′π+nin the Resonance Region

Author: Elton Smith, B. S. Ishkanov, E. Golovatch, M. Ungaro, V. Frolov, M. J. Amaryan, D. S. Armstrong, J. R. Calarco, S. A. Philips, J. Ficenec, L. Ciciani, R. A. Schumacher, Shalev Gilad, R. A. Demirchyan, L. C. Dennis, B. E. Bonner, M. Anghinolfi, James Mueller, T. A. Forest, S. Stepanyan, Avraham Klein, H. Avakian, A.V. Stavinsky, P. D. Rubin, Hall Crannell, Y. G. Sharabian, K. L. Giovanetti, B. Asavapibhop, L. Elouadrhiri, M. Osipenko, M. Klusman, G. E. Dodge, B. B. Niczyporuk, D. J. Tedeschi, K. Beard, Kalvir S. Dhuga, J. P. Cummings, Dinko Pocanic, R. C. Minehart, C. A. Meyer, M. Taiuti, N. Pivnyuk, J. Napolitano, R. J. Feuerbach, J. Lachniet, D. Rowntree, J. Yun, D. Cords, A. Yegneswaran, P. V. Degtyarenko, K. Kim, K. Loukachine, I. Niculescu, D. Lawrence, G. S. Adams, K. Joo, A. Cazes, Bernhard Mecking, M. Guidal, G. Niculescu, E. Pasyuk, C. Marchand, Larry Weinstein, S. A. Dytman, I. I. Strakovsky, G. Gavalian, J. S. McCarthy, K. V. Dharmawardane, R. De Vita, G. V. O'Rielly, G. Asryan, M. Holtrop, Thomas E. Smith, K. Park, M. Kossov, S. E. Kuhn, D. P. Weygand, E. Anciant, R. A. Niyazov, B. Carnahan, J. H. Kelley, D. G. Jenkins, M. Battaglieri, W. K. Brooks, A. K. Opper, A. Empl, O. Pogorelko, P. Dragovitsch, F. Sabatié, Daniel S. Carman, Sylvain Bouchigny, K. Sabourov, Federico Ronchetti, L. M. Qin, L. C. Smith, M. Khandaker, S. J. Gaff, G. Riccardi, J. W C McNabb, E. De Sanctis, P. Corvisiero, Victor Mokeev, C. E. Hyde-Wright, G. Audit, L. Sorrell, Thierry Auger, P. Rossi, Barry Ritchie, Baile Zhang, A. Weisberg, A. R. Reolon, D. Protopopescu, J. Hardie, M. Ripani, Michael Vineyard, Patrick Girard, J. Shaw, S. Pozdniakov, M. Garçon, D. Doughty, M. Bektasoglu, S. McAleer, V. Gyurjyan, C. Djalali, W. Kim, Cynthia Marie Hadjidakis, P. Stoler, H. Denizli, D. Heddle, M. Lucas, V. S. Serov, F. W. Hersman, W. Major, K. A. Griffioen, Y. Kuang, Michael Dugger, S. O. Nelson, Z. L. Zhou, H. Bagdasaryan, A. Shafi, H. Egiyan, K. Hicks, Roy Thompson, D. I. Sober, D. Hancock, E. Polli, J. Connelly, A. Coleman, Stephen M. Rock, K. S. Egiyan, M. Guillo, G. Ricco, Ji Li, C. S. Whisnant, A. Longhi, E. Wolin, K. Mikhailov, H. Funsten, P. Bosted, P. Heimberg, J. Hu, J. P. Ball, Y. Prok, J. W. Price, M. Eckhause, Philip L. Cole, M. D. Mestayer, K. Y. Kim, M. Sargsyan, J. D. Kellie, D. G. Crabb, M. Spraker, G. P. Capitani, Nicola Bianchi, K. Livingston, S. Taylor, S. Bueltmann, G. A. Peterson, S. Barrow, R. Fatemi, A. V. Vlassov, S. Boiarinov, B. M. Preedom, A. V. Skabelin, G. S. Mutchler, Moshe Gai, H. R. Weller, Friedrich Klein, R. S. Hicks, K. Wang, Brian Raue, C. Salgado, J. J. Manak, M. M. Ito, L. Todor, Laird Kramer, Jing Zhao, L. Farhi, V. Sapunenko, Valeria Muccifora, Volker D. Burkert, A. S. Biselli, Gerard Gilfoyle, R. A. Miskimen, D. Branford, M. Mirazita, and J. M. Laget
Subjects: Physics, Nuclear physics, media_common.quotation_subject, Cathode ray, General Physics and Astronomy, Resonance, High Energy Physics::Experiment, Nuclear Experiment, Spin (physics), Asymmetry, Helicity, media_common
Abstract: The double spin asymmetry in the (-->)e(-->)p --> e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A1 for the F(15)(1680) resonance than expected from the analysis of the unpolarized data.
Published: 2002

111. POLARIZABILITIES IN REAL AND VIRTUAL COMPTON SCATTERING

Author: C. E. Hyde-Wright
Subjects: Nuclear physics, Physics, Compton scattering, Inelastic scattering
Published: 2001

112. First measurement of the double spin asymmetry in (--)e(--)p--e(prime)pi(+)n in the resonance region

Author: R, De Vita, M, Anghinolfi, V D, Burkert, G E, Dodge, R, Minehart, M, Taiuti, H, Weller, G, Adams, M J, Amaryan, E, Anciant, D S, Armstrong, B, Asavapibhop, G, Asryan, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S, Barrow, M, Battaglieri, K, Beard, M, Bektasoglu, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, P, Bosted, S, Bouchigny, D, Branford, W K, Brooks, S, Bueltmann, J R, Calarco, G P, Capitani, D S, Carman, B, Carnahan, A, Cazes, L, Ciciani, P L, Cole, A, Coleman, J, Connelly, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, De Sanctis, P V, Degtyarenko, R, Demirchyan, H, Denizli, L, Dennis, K V, Dharmawardane, K S, Dhuga, C, Djalali, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, L, Farhi, R, Fatemi, R J, Feuerbach, J, Ficenec, T A, Forest, V, Frolov, H, Funsten, S J, Gaff, M, Gai, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, E, Golovatch, K, Griffioen, M, Guidal, M, Guillo, V, Gyurjyan, C, Hadjidakis, D, Hancock, J, Hardie, D, Heddle, P, Heimberg, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, B S, Ishkanov, M M, Ito, D, Jenkins, K, Joo, J H, Kelley, J D, Kellie, M, Khandaker, K Y, Kim, K, Kim, W, Kim, A, Klein, F J, Klein, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Lachniet, J M, Laget, D, Lawrence, Ji, Li, K, Livingston, A, Longhi, K, Loukachine, M, Lucas, W, Major, J J, Manak, C, Marchand, S, McAleer, J, McCarthy, J W C, McNabb, B A, Mecking, M D, Mestayer, C A, Meyer, K, Mikhailov, M, Mirazita, R, Miskimen, V, Mokeev, V, Muccifora, J, Mueller, G S, Mutchler, J, Napolitano, S O, Nelson, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, A K, Opper, G V, O'Rielly, M, Osipenko, K, Park, E, Pasyuk, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B A, Raue, A R, Reolon, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, S, Rock, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, F, Sabatié, K, Sabourov, C, Salgado, V, Sapunenko, M, Sargsyan, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, A V, Skabelin, E S, Smith, T, Smith, L C, Smith, D I, Sober, L, Sorrell, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, I I, Strakovsky, S, Taylor, D J, Tedeschi, R, Thompson, L, Todor, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, L B, Weinstein, A, Weisberg, D P, Weygand, C S, Whisnant, E, Wolin, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The double spin asymmetry in the (--)e(--)p --e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A1 for the F(15)(1680) resonance than expected from the analysis of the unpolarized data.
Published: 2001

113. Corrected Article: Exclusive electroproduction of φ mesons at 4.2 GeV [Phys. Rev. C63, 065205 (2001)]

Author: J. Domingo, R. A. Schumacher, R. A. Niyazov, John T. O'Brien, G. S. Mutchler, H. O. Funsten, Dinko Pocanic, E. S. Smith, A. Coleman, H. R. Weller, M. D. Mestayer, J. J. Manak, S. E. Kuhn, P. Corvisiero, S. McAleer, J. H. Kelley, Stephen Taylor, Sylvain Bouchigny, P. Rossi, T. A. Forest, S. Stepanyan, K. S. Dhuga, G. Gavalian, S. Boiarinov, J. R. Ficenec, M. Anghinolfi, K. A. Griffioen, J. R. Calarco, S. A. Philips, L. C. Dennis, B. E. Bonner, H. Avakian, K. S. Egiyan, M. M. Ito, Laird Kramer, B. B. Niczyporuk, Jing Zhao, James Mueller, L. C. Smith, S. J. Gaff, K. Mikhailov, Shalev Gilad, G. E. Dodge, J. S. McCarthy, M. Taiuti, R. Fatemi, Y. G. Sharabian, J. Hu, M. Ripani, N. Pivnyuk, K. Lukashin, J. Napolitano, E. Wolin, Michael Vineyard, P. Dragovitsch, G. V. O'Rielly, Baile Zhang, M. Guidal, A. K. Opper, W. J. Briscoe, E. Pasyuk, M. Battaglieri, A. V. Vlassov, D. G. Jenkins, K. Park, B. A. Mecking, J. P. Ball, D. S. Carman, P. Rubin, M. Eckhause, H. Egiyan, C. Djalali, S. Whisnant, B. M. Preedom, K. Sabourov, G. Niculescu, J. P. Cummings, L. M. Qin, S. A. Dytman, R. A. Miskimen, Volker D. Burkert, A. S. Biselli, D. G. Crabb, J. Hardie, V. Gyurjyan, E. Polli, P. Stoler, Kevin Fissum, M. Holtrop, A.V. Stavinsky, D. Branford, M. Guillo, M. Kossov, M. Mirazita, S. O. Nelson, K. Wang, W. Kim, J. M. Laget, S. Pozdniakov, L. Elouadrhiri, D. J. Tedeschi, K. Hicks, C. Salgado, Robert E. Welsh, Roy Thompson, K. Paschke, I. I. Strakovsky, Z. L. Zhou, M. Klusman, Andreas Klein, V. Sapunenko, Valeria Muccifora, J. W. Price, Kwangsoo Kim, G. Riccardi, A. Longhi, G. S. Adams, R. Clark, Gerard Gilfoyle, R. DeVita, J. W C McNabb, A. Empl, Pavel Degtiarenko, E. De Sanctis, G. Audit, O. Pogorelko, C. E. Hyde-Wright, D. I. Sober, R. J. Feuerbach, K. Beard, Frank Klein, G. A. Peterson, S. Barrow, M. Bektasoglu, K. Joo, Patrick Girard, J. Shaw, J. Yun, D. Cords, A. Yegneswaran, Nicola Bianchi, B. Carnahan, F. Sabatié, V. S. Serov, Thierry Auger, A. R. Reolon, A. P. Freyberger, Federico Ronchetti, G. Ricco, Moshe Gai, R. S. Hicks, Brian Raue, Barry Ritchie, R. C. Minehart, C. A. Meyer, L. Ciciani, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, William Bertozzi, E. Anciant, M. Khandaker, D. P. Weygand, D. Doughty, D. Heddle, A. V. Skabelin, K. Kim, I. Niculescu, D. Lawrence, William Brooks, Hall Crannell, C. Marchand, D. Rowntree, L. Yanik, P. L. Cole, and F. W. Hersman
Subjects: Physics, Elastic scattering, Nuclear and High Energy Physics, Particle physics, Meson production, Proton, Meson, Vector meson dominance, Production (computer science), HERA
Abstract: We studied the exclusive reaction $e\stackrel{\ensuremath{\rightarrow}}{p}{e}^{\ensuremath{'}}{p}^{\ensuremath{'}}\ensuremath{\varphi}$ using the $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\varphi}}{K}^{+}{K}^{\ensuremath{-}}$ decay mode. The data were collected using a 4.2 GeV incident electron beam and the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. Our experiment covers the range in ${Q}^{2}$ from 0.7 to 2.2 ${\mathrm{GeV}}^{2},$ and W from 2.0 to 2.6 GeV. Taken together with all previous data, we find a consistent picture of $\ensuremath{\varphi}$ production on the proton. Our measurement shows the expected decrease of the t slope with the vector-meson formation time $c\ensuremath{\Delta}\ensuremath{\tau}$ below 2 fm. At $〈c\ensuremath{\Delta}\ensuremath{\tau}〉=0.6$ fm, we measure ${b}_{\ensuremath{\varphi}}=2.27\ifmmode\pm\else\textpm\fi{}0.42$ ${\mathrm{GeV}}^{\ensuremath{-}2}.$ The cross section dependence on W as ${W}^{0.2\ifmmode\pm\else\textpm\fi{}0.1}$ at ${Q}^{2}=1.3$ ${\mathrm{GeV}}^{2}$ was determined by comparison with $\ensuremath{\varphi}$ production at HERA after correcting for threshold effects. This is the same dependence as observed in photoproduction.
Published: 2001

114. Photoproduction of theρ0Meson on the Proton at Large Momentum Transfer

Author: V. Frolov, M. J. Amaryan, V. Mokeev, A. Cazes, J. P. Cummings, R. De Vita, P. Dragovitsch, Roy Thompson, R. Demirchyan, K. V. Dharmawardane, G. Asryan, R. A. Niyazov, M. Kossov, Volker D. Burkert, A. S. Biselli, J. Hardie, K. L. Giovanetti, B. Asavapibhop, R. A. Miskimen, John T. O'Brien, M. Spraker, Larry Weinstein, Laird Kramer, G. S. Adams, B. L. Berman, P. Corvisiero, G. Riccardi, M. Taiuti, M. Battaglieri, Susan Taylor, L. M. Qin, K. Joo, K. Beard, E. Anciant, L. Todor, D. Protopopescu, Kalvir S. Dhuga, K. S. Egiyan, B. A. Mecking, J. R. Calarco, A.V. Stavinsky, M. Klusman, M. M. Ito, H. Egiyan, W. Kim, R. W. Major, E. Wolin, J. W C McNabb, A. P. Freyberger, K. Mikhailov, D. J. Tedeschi, M. Khandaker, D. Branford, K. A. Griffioen, M. Mirazita, Z. L. Zhou, A. Shafi, Dinko Pocanic, L. Farhi, M. Sanzone-Arenhovel, Federico Ronchetti, J. M. Laget, B. B. Niczyporuk, D. Doughty, Shalev Gilad, B. Carnahan, G. Ricco, D. G. Crabb, N. Pivnyuk, D. Heddle, C. S. Whisnant, S. E. Kuhn, J. Napolitano, P. Stoler, A. Coleman, Philip L. Cole, H. R. Weller, Thierry Auger, A. Weisberg, A. R. Reolon, Moshe Gai, K. Sabourov, S. O. Nelson, J. Shaw, K. Hicks, M. Eckhause, P. Rossi, C. Djalali, Michael Wood, M. Lucas, R. J. Feuerbach, Friedrich Klein, R. S. Hicks, Brian Raue, V. S. Serov, V. Sapunenko, Valeria Muccifora, Michael Dugger, J. H. Kelley, F. W. Hersman, H. O. Funsten, M. Guillo, S. McAleer, J. S. McCarthy, A. V. Vlassov, Gerard Gilfoyle, O. Pogorelko, K. Lukashin, L. C. Dennis, L. C. Smith, S. J. Gaff, Nicola Bianchi, H. Avakian, L. Elouadrhiri, G. S. Mutchler, Jing Zhao, W. J. Briscoe, M. Ripani, S. A. Dytman, Elton Smith, E. N. Golovach, G. A. Peterson, W. K. Brooks, S. Barrow, J. R. Ficenec, D. S. Armstrong, M. Anghinolfi, J. Yun, D. Cords, James Mueller, A. Yegneswaran, P. D. Rubin, Y. G. Sharabian, E. DeSanctis, Baile Zhang, J. J. Manak, A. K. Opper, Y. Kuang, V. Gyurjyan, E. Polli, D. I. Sober, J. W. Price, D. Hancock, H. Denizli, A. V. Skabelin, R. C. Minehart, C. A. Meyer, D. P. Weygand, Barry Ritchie, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Bektasoglu, S. A. Philips, M. Guidal, M. D. Mestayer, M. Holtrop, Thomas E. Smith, S. Boiarinov, R. A. Schumacher, T. A. Forest, S. Stepanyan, Avraham Klein, Hall Crannell, C. Cetina, C. Marchand, G. E. Dodge, Michael Vineyard, B. M. Preedom, P. V. Degtyarenko, D. Lawrence, G. P. Capitani, C. Salgado, and D. Rowntree
Subjects: Nuclear physics, Physics, Proton, Meson, Momentum transfer, General Physics and Astronomy
Published: 2001

115. Photoproduction of the rho(0) meson on the proton at large momentum transfer

Author: M, Battaglieri, E, Anciant, M, Anghinolfi, R, De Vita, E, Golovach, J M, Laget, V, Mokeev, M, Ripani, G, Adams, M J, Amaryan, D S, Armstrong, B, Asavapibhop, G, Asryan, G, Audit, T, Auger, H, Avakian, S, Barrow, K, Beard, M, Bektasoglu, B L, Berman, N, Bianchi, A S, Biselli, S, Boiarinov, D, Branford, W J, Briscoe, W K, Brooks, V D, Burkert, J R, Calarco, G P, Capitani, D S, Carman, B, Carnahan, A, Cazes, C, Cetina, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, DeSanctis, P V, Degtyarenko, R, Demirchyan, H, Denizli, L, Dennis, K V, Dharmawardane, K S, Dhuga, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, L, Farhi, R J, Feuerbach, J, Ficenec, T A, Forest, A P, Freyberger, V, Frolov, H, Funsten, S J, Gaff, M, Gai, S, Gilad, G P, Gilfoyle, K L, Giovanetti, K, Griffioen, M, Guidal, M, Guillo, V, Gyurjyan, D, Hancock, J, Hardie, D, Heddle, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, C E, Hyde-Wright, M M, Ito, K, Joo, J H, Kelley, M, Khandaker, W, Kim, A, Klein, F J, Klein, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, D, Lawrence, M, Lucas, K, Lukashin, R W, Major, J J, Manak, C, Marchand, S, McAleer, J, McCarthy, J W, McNabb, B A, Mecking, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Muccifora, J, Mueller, G S, Mutchler, J, Napolitano, S O, Nelson, B B, Niczyporuk, R A, Niyazov, J T, O'Brien, A K, Opper, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, B M, Preedom, J W, Price, D, Protopopescu, L M, Qin, B A, Raue, A R, Reolon, G, Riccardi, G, Ricco, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, K, Sabourov, C, Salgado, M, Sanzone-Arenhovel, V, Sapunenko, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, A V, Skabelin, E S, Smith, T, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, M, Taiuti, S, Taylor, D J, Tedeschi, L, Todor, R, Thompson, M F, Vineyard, A V, Vlassov, L B, Weinstein, A, Weisberg, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M, Wood, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The differential cross section, d sigma/dt, for rho(0) meson photoproduction on the proton above the resonance region was measured up to a momentum transfer -t = 5 GeV2 using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The rho(0) channel was extracted from the measured two charged-pion cross sections by fitting the pi(+)pi(-) and p pi(+) invariant masses. The low momentum transfer region shows the typical diffractive pattern expected from Reggeon exchange. The flatter behavior at large -t cannot be explained solely in terms of QCD-inspired two-gluon exchange models. The data indicate that other processes, like quark interchange, are important to fully describe rho photoproduction.
Published: 2001

116. Dynamics of the 16O(e, e'p) reaction at high missing energies

Author: N, Liyanage, B D, Anderson, K A, Aniol, L, Auerbach, F T, Baker, J, Berthot, W, Bertozzi, P Y, Bertin, L, Bimbot, W U, Boeglin, E J, Brash, V, Breton, H, Breuer, E, Burtin, J R, Calarco, L, Cardman, G D, Cates, C, Cavata, C C, Chang, J P, Chen, E, Cisbani, D S, Dale, R, De Leo, A, Deur, B, Diederich, P, Djawotho, J, Domingo, B, Doyle, J E, Ducret, M B, Epstein, L A, Ewell, J M, Finn, K G, Fissum, H, Fonvieille, B, Frois, S, Frullani, J, Gao, F, Garibaldi, A, Gasparian, S, Gilad, R, Gilman, A, Glamazdin, C, Glashausser, J, Gomez, V, Gorbenko, T, Gorringe, F W, Hersman, R, Holmes, M, Holtrop, N, d'Hose, C, Howell, G M, Huber, C E, Hyde-Wright, M, Iodice, C W, de Jager, S, Jaminion, M K, Jones, K, Joo, C, Jutier, W, Kahl, S, Kato, J J, Kelly, S, Kerhoas, M, Khandaker, M, Khayat, K, Kino, W, Korsch, L, Kramer, K S, Kumar, G, Kumbartzki, G, Laveissière, A, Leone, J J, LeRose, L, Levchuk, M, Liang, R A, Lindgren, G J, Lolos, R W, Lourie, R, Madey, K, Maeda, S, Malov, D M, Manley, D J, Margaziotis, P, Markowitz, J, Martino, J S, McCarthy, K, McCormick, J, McIntyre, R L, van der Meer, Z E, Meziani, R, Michaels, J, Mougey, S, Nanda, D, Neyret, E A, Offermann, Z, Papandreou, C F, Perdrisat, R, Perrino, G G, Petratos, S, Platchkov, R, Pomatsalyuk, D L, Prout, V A, Punjabi, T, Pussieux, G, Quéméner, R D, Ransome, O, Ravel, Y, Roblin, R, Roche, D, Rowntree, G A, Rutledge, P M, Rutt, A, Saha, T, Saito, A J, Sarty, A, Serdarevic-Offermann, T P, Smith, A, Soldi, P, Sorokin, P, Souder, R, Suleiman, J A, Templon, T, Terasawa, L, Todor, H, Tsubota, H, Ueno, P E, Ulmer, G M, Urciuoli, P, Vernin, S, van Verst, B, Vlahovic, H, Voskanyan, J W, Watson, L B, Weinstein, K, Wijesooriya, R, Wilson, B, Wojtsekhowski, D G, Zainea, V, Zeps, J, Zhao, and Z L, Zhou
Abstract: We measured the cross section and response functions for the quasielastic 16O(e,e'p) reaction for missing energies 25or =E(m)or =120 MeV at missing momenta P(m)or =340 MeV/c. For 25E(m)50 MeV and P(m) approximately 60 MeV/c, the reaction is dominated by a single 1s(1/2) proton knockout. At larger P(m), the single-particle aspects are increasingly masked by more complicated processes. Calculations which include pion exchange currents, isobar currents, and short-range correlations account for the shape and the transversity, but for only half of the magnitude of the measured cross section.
Published: 2000

117. Exclusive Compton Scattering on the Proton

Author: William Bertozzi, W. Hersman, M. Bouwhuis, C. E. Hyde-Wright, Ronald Gilman, R. J. Holt, Y. Roblin, X. Jiang, Pete Markowitz, Matthew Jones, P.Y. Bertin, Gerald Feldman, G. E. Dodge, M. Kuss, K. Wijesooriya, V. Gladyshev, R. A. Lindgren, J. J. LeRose, G. Chang, C. E. Keppel, P. V. Degtyarenko, J. P. Chen, John C. Mitchell, A. Shahinyan, Nilanga Liyanage, G. Strobel, A. Gasparian, J. Berthot, S. Strauch, T. Chang, R. Michaels, Anatoly Radyushkin, M. B. Leuschner, Rolf Ent, Andrei Afanasev, J. A. Templon, D. S. Brown, C. DeJager, H. Voskanyan, A. Petrosyan, Frank Klein, A. Saha, J. Gomez, Ronald Ransome, Larry Weinstein, D. Rowntree, K. S. Egiyan, F. Sabatié, Z. Zu, W.U. Boeglin, P. M. Rutt, Alan M. Nathan, M. Liang, J. Hines, P. E. Bosted, M. Roedelbronn, Olfred Hansen, S. E. Williamson, S. Mailyan, P. E. Ulmer, C. Glashausser, E. Chudakov, E. Hoohauneysan, C. L. Morris, S. Churchwell, Shalev Gilad, John M. Finn, C. R. Howell, J. R. Calarco, Bogdan Wojtsekhowski, A. Ketikyan, and H. Fonvielle
Subjects: Physics, Elastic scattering, Nuclear physics, Photon, Proton, Scattering, Bremsstrahlung, Compton scattering, Parton, Electron, Nuclear Experiment, Particle Physics - Experiment
Abstract: An experiment is proposed to measure the cross sections for Real Compton Scattering from the proton in the energy range 3-6 GeV and over a wide angular range; and to measure the longitudinal and transverse components of the polarization transfer to the recoil proton at a single kinematic point. Together; these measurements will test models of the reaction mechanism and determine new structure functions of the proton that are related to the same nonforward parton densities that determine the elastic electron scattering form factors and the parton densities. The experiment utilizes an untagged bremsstrahlung photon beam and the standard Hall A cryogenic targets. The scattered photon is detected in a photon spectrometer; currently under construction. The coincident recoil proton is detected in one of the Hall A magnetic spectrometers and its polarization components are measured in the existing Focal Plane Polarimeter. This proposal extends and supercedes E97-108 which was approved by PAC13.
Published: 1999

118. Measurements of theΔ(1232)transition form factor and the ratioσn/σpfrom inelastic electron-proton and electron-deuteron scattering

Author: P. E. Bosted, Sayed Rokni, R. A. Gearhart, M. Spengos, G. A. Peterson, K. Swartz, K. A. Griffioen, A. Lung, J. Lichtenstadt, S. E. Rock, S. E. Kuhn, L. Andivahis, R. G. Arnold, L. H. Tao, J. Gomez, W. R. Dodge, J. Alster, C. E. Hyde-Wright, L. M. Stuart, F. S. Dietrich, G. G. Petratos, Sakumoto Wk, R. S. Hicks, Z. M. Szalata, C. C. Chang, C. E. Keppel, and R. A. Miskimen
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, Deuterium, Scattering, Form factor (quantum field theory), Resonance, Perturbative QCD, Production (computer science), Atomic physics, Deep inelastic scattering
Abstract: Measurements of inclusive electron-scattering cross sections using hydrogen and deuterium targets in the region of the $\ensuremath{\Delta}(1232)$ resonance are reported. A global fit to these new data and previous data in the resonance region is also reported for the proton. Transition form factors have been extracted from the proton cross sections for this experiment over the four-momentum transfer squared range $1.64l{Q}^{2}l6.75 (\mathrm{GeV}{/c)}^{2}$ and from previous data over the range $2.41l{Q}^{2}l9.82 (\mathrm{GeV}{/c)}^{2}.$ The results confirm previous reports that the $\ensuremath{\Delta}(1232)$ transition form factor decreases more rapidly with ${Q}^{2}$ than expected from perturbative QCD. The ratio of ${\ensuremath{\sigma}}_{n}/{\ensuremath{\sigma}}_{p}$ in the $\ensuremath{\Delta}(1232)$ resonance region has been extracted from the deuteron data for this experiment in the range $1.64l{Q}^{2}l3.75 (\mathrm{G}\mathrm{e}\mathrm{V}/{c)}^{2}$ and for a previous experiment in the range $2.4l{Q}^{2}l7.9 (\mathrm{GeV}{/c)}^{2}.$ A study has been made of the model dependence of these results. This ratio ${\ensuremath{\sigma}}_{n}/{\ensuremath{\sigma}}_{p}$ for $\ensuremath{\Delta}(1232)$ production is slightly less than unity, while ${\ensuremath{\sigma}}_{n}/{\ensuremath{\sigma}}_{p}$ for the nonresonant cross sections is approximately 0.5, which is consistent with deep inelastic scattering results.
Published: 1998

119. Constraints on Coupling Constants through Charged $\Sigma$ Photoproduction

Author: C. Bennhold, C. E. Hyde-Wright, and Terry Mart
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Statistics::Applications, Meson, Nuclear Theory, Astrophysics::High Energy Astrophysical Phenomena, Hadron, High Energy Physics::Phenomenology, Hyperon, Elementary particle, Lambda baryon, Sigma baryon, Baryon, High Energy Physics - Phenomenology, Isospin
Abstract: The few available data for the reactions $\gamma p \rightarrow K^{0} \Sigma^{+}$ and $\gamma n \rightarrow K^{+} \Sigma^{-}$ are compared to models developed for the processes $\gamma p \rightarrow K^{+} \Sigma^{0}$ and $\gamma p \rightarrow K^{+} \Lambda$. It is found that some of these phenomenological models overpredict the measurements by up to a factor of 100. Fitting the data for all of these reactions leads to drastically reduced Born coupling constants., Comment: 12 pages RevTeX-file, 2 postscript figures available upon request, to appear in Phys. Rev. C, March 1995 (Rapid Comm.).
Published: 1995

120. Neutron electromagnetic form factors

Author: D. Keane, Richard Madey, Hartmuth Arenhövel, R. W. Lourie, T. Payerle, John M. Finn, K. A. Dow, R. R. Whitney, D. M. Manley, J.M. Cameron, D. R. Tieger, T. Eden, T. Reichelt, W. M. Zhang, Wolfgang Korsch, M. Spraker, C. E. Hyde-Wright, William Bertozzi, B. D. Anderson, P.J. Pella, C. C. Chang, Pete Markowitz, J. W. Watson, B. Ni, A. R. Baldwin, S. Kowalski, P. E. Ulmer, M. Farkhondeh, P. M. Rutt, G. W. Dodson, D. Barkhuff, Larry Weinstein, W. ‐D. Jiang, S.P. Van Verst, W. Turchinetz, James J. Kelly, F. Gross, J. Y. Mougey, B. S. Flanders, and K. Beard
Subjects: Quark, Nuclear physics, Physics, Field (physics), Nuclear Theory, Quark model, Nuclear structure, Electric form factor, Neutron, Nuclear Experiment, Nucleon, Linear particle accelerator
Abstract: Nucleon form factors provide fundamental input for nuclear structure and quark models. Current knowledge of neutron form factors, particularly the electric form factor of the neutron, is insufficient to meet these needs. Developments of high‐duty‐factor accelerators and polarization‐transfer techniques permit new experiments that promise results with small sensitivities to nuclear models. We review the current status of the field, our own work at the MIT/Bates linear accelerator, and future experimental efforts.
Published: 1992

121. Status of Bates experiment 85-05: The electric form factor of the neutron from the d(e[downward right arrow],e’n[downward right arrow])p reaction

Author: R. R. Whitney, C. E. Hyde-Wright, G. W. Dodson, K. Beard, R. W. Lourie, W. ‐D. Jiang, Richard Madey, B. D. Anderson, B. Ni, Wolfgang Korsch, P. E. Ulmer, A. R. Baldwin, D. Barkhuff, J. W. Watson, T. Reichelt, C. C. Chang, Larry Weinstein, James J. Kelly, William Bertozzi, Pete Markowitz, M. Spraker, P.J. Pella, J. Y. Mougey, W. M. Zhang, S. Kowalski, P. M. Rutt, S. Van Verst, Justin I. McIntyre, D. Keane, D. M. Manley, John M. Finn, K. A. Dow, W. Turchinetz, B. S. Flanders, T. Eden, M. Farkhondeh, T. Payerle, J.M. Cameron, and D. R. Tieger
Subjects: Physics, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Electric form factor, Polarimeter, Inelastic scattering, Neutron scattering, (n-p) reaction, Nuclear physics, Cathode ray, Physics::Accelerator Physics, Neutron, Atomic physics, Nuclear Experiment
Abstract: The Bates E85‐05 Collaboration measured the polarization of the neutron in the d(e↘,en↘)p reaction in the quasifree region with the objective of extracting the electric form factor of the neutron. Electron‐neutron coincidence spectra were obtained during 567 μA‐hours of integrated beam. We succeeded in operating a Mo/ller scattering polarimeter in the coincidence mode with a low‐duty factor accelerator in order to measure the polarization of the electron beam.
Published: 1992

122. Empirical density-dependent effective interaction for nucleon-nucleus scattering at 500 MeV

Author: C. E. Hyde-Wright, M. V. Hynes, B. L. Berman, G. Igo, James J. Kelly, G.S. Weston, J. B. McClelland, B. S. Flanders, D. Lopiano, William Bertozzi, P. E. Ulmer, R. Lourie, C. A. Whitten, B. E. Norum, B. Aas, A. Azizi, H. Seifert, A. Wong, and J. M. Finn
Subjects: Elastic scattering, Nuclear reaction, Physics, Nuclear and High Energy Physics, medicine.anatomical_structure, Scattering, Density dependent, medicine, Impulse (physics), Atomic physics, Nucleon, Nucleus, Excitation
Abstract: We report new cross-section and analyzing-power data for the excitation by 498-MeV protons of all narrow normal-parity states of {sup 16}O below 12.1-MeV excitation. In addition, spin-rotation measurements for elastic scattering and depolarization measurements for the 1{sub 1}{sup {minus}}, 2{sub 1}{sup +}, and 3{sub 1}{sup {minus}} states of {sup 16}O have been performed. These data are used in conjunction with existing data for {sup 40}Ca to study medium corrections to the effective interaction for nucleon-nucleus scattering at 500 MeV. Systematic differences between the data and nonrelativistic impulse approximation calculations based upon either the free {ital t} matrix or a recent density-dependent effective interaction are interpreted within the framework of the local-density approximation. An empirical effective interaction has been constructed which parametrizes the density dependence of the medium modifications in a simple form amenable to phenomenological analysis of data.
Published: 1991

123. Electroexcitation of theΔresonance in the (e,e’p) reaction

Author: F. W. Hersman, M. B. Epstein, P. E. Ulmer, D. J. Margaziotis, J. R. Calarco, E. J. Winhold, P. K. Teng, Larry Weinstein, R. W. Lourie, W. W. Sapp, H. Baghaei, William Bertozzi, C. E. Hyde-Wright, Nasser Kalantar-Nayestanaki, M. Yamazaki, K. I. Blomqvist, C. F. Perdrisat, Jenny Nelson, John M. Finn, V V Punjabi, C. P. Sargent, J. Flanz, and B. H. Cottman
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Missing energy, Nuclear Theory, Momentum transfer, Resonance (particle physics), Delta baryon, Nuclear physics, Baryon, Pion, Atomic physics, Nuclear Experiment, Nucleon
Abstract: The /sup 12/C(e,e'p) reaction at the delta resonance has been measured for protons detected parallel to the momentum transfer at two kinematical situations: at the maximum and the low-energy-loss side of the peak. The cross section was measured for missing energies up to 320 and 220 MeV, respectively. In the missing energy spectrum two distinct structures are observed, which correspond to multinucleon knockout and quasifree pion production processes. In addition, there is a remnant of the quasifree knockout process.
Published: 1989

124. Electroexcitation of isoscalar states insup16O

Author: J. M. Finn, B. Murdock, S. Kowalski, M.V. Hynes, M. A. Kovash, C. P. Sargent, B. Pugh, B. E. Norum, W. Turchinetz, T. N. Buti, R. W. Lourie, F. W. Hersman, James J. Kelly, William Bertozzi, C. E. Hyde-Wright, and B. L. Berman
Subjects: Physics, Nuclear reaction, Elastic scattering, Nuclear and High Energy Physics, Scattering, Isoscalar, Momentum transfer, Inelastic scattering, Atomic physics, Omega, Oxygen-16
Abstract: We report high resolution measurements of inelastic electron scattering to all narrow normal-parity states of $^{16}\mathrm{O}$ up to 12.05 MeV, which include states with ${J}_{n}^{\ensuremath{\pi}}$(${E}_{x}$ MeV): ${0}_{2}^{+}$(6.049), ${0}_{3}^{+}$(12.049), ${1}_{1}^{\mathrm{\ensuremath{-}}}$(7.117), ${2}_{1}^{+}$(6.917), ${2}_{2}^{+}$(9.845), ${2}_{3}^{+}$(11.52), ${3}_{1}^{\mathrm{\ensuremath{-}}}$(6.130), ${4}_{1}^{+}$(10.356), and ${4}_{2}^{+}$(11.097). The measurements were performed primarily at 90\ifmmode^\circ\else\textdegree\fi{} and 160\ifmmode^\circ\else\textdegree\fi{} and span momentum transfers between 0.6 and 2.6 ${\mathrm{fm}}^{\mathrm{\ensuremath{-}}1}$. Improved line shape fitting techniques have been developed. These are the first electron scattering measurements for the ${4}_{2}^{+}$ state and of second form-factor maxima for several states. The form factor for excitation of the ${2}_{2}^{+}$ state is strikingly different from that of the other ${2}^{+}$ states and indicates a transition density peaked in the interior. Transition charge densities were extracted from a combined data set that includes earlier electron scattering data renormalized to a recent analysis of elastic scattering from $^{16}\mathrm{O}$. Comparisons have been made with several structure models, including the Brown-Green model, the weak-coupling model, a 2\ensuremath{\Elzxh}\ensuremath{\omega} shell model, and the tetrahedral alpha-cluster model.
Published: 1986

125. Magnetic structure ofO17at high momentum

Author: James J. Kelly, C. E. Hyde-Wright, Larry Weinstein, William Bertozzi, M. V. Hynes, B. L. Berman, C. P. Sargent, P. E. Ulmer, S. Dixit, S. Kowalski, R. W. Lourie, Nasser Kalantar-Nayestanaki, J. M. Finn, and H. Baghaei
Subjects: Physics, Nuclear physics, Elastic scattering, Momentum, Magnetic moment, Condensed matter physics, Magnetic structure, Scattering, Momentum transfer, Magnetic form factor, Form factor (quantum field theory), General Physics and Astronomy
Abstract: The elastic magnetic form factor of $^{17}\mathrm{O}$ has been measured for effective momentum transfers 2.47\ensuremath{\le}${\mathrm{q}}_{\mathrm{eff}}$\ensuremath{\le}3.65 ${\mathrm{fm}}^{\mathrm{\ensuremath{-}}1}$ by electron scattering. The form factor drops by almost three decades in this range. The data follow an extreme single-particle Woods-Saxon shell-model calculation. Many-body effects such as meson-exchange currents or core polarization do not seem to play a significant role in the q range of this experiment.
Published: 1988

126. Electroexcitation ofM4transitions inO17andO18

Author: S. Kowalski, B. Murdock, C. E. Hyde-Wright, B. Pugh, F. W. Hersman, James J. Kelly, D. M. Manley, R. W. Lourie, M.V. Hynes, B. E. Norum, C. P. Sargent, B. L. Berman, John M. Finn, Michael A. Kovash, and William Bertozzi
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Angular momentum, Isovector, Spins, Scattering, Excited state, Momentum transfer, Inelastic scattering, Atomic physics
Abstract: We report the results of a study of high-resolution inelastic electron scattering from /sup 17/O and /sup 18/O at excitation energies between 15 and 23 MeV. Measurements were performed at 90/sup 0/ for momentum transfers of 1.4, 1.5, 1.7, and 1.9 fm/sup -1/ and at 160/sup 0/ for a momentum transfer of 1.7 fm/sup -1/. Several prominent narrow peaks were observed in the spectra of both nuclei. The measured form factors for levels in /sup 17/O at 15.78, 17.06, 20.14, and 20.70 MeV and in /sup 18/O at 18.70, 20.36, and 22.39 MeV are, within experimental uncertainties, completely transverse. These strongly excited states are assumed to arise from isovector M4 transitions of the type 1p/sub 3/2/..-->..1d/sub 5/2/. A simple weak-coupling model is used to assign spins to the levels in /sup 17/O. Finally, we also report measurements for several narrow states in both nuclei, for which the spins and parities have not yet been identified.
Published: 1986

127. Neutron transition density for the lowest 2+ state of 18O

Author: A.D. Bacher, M.V. Hynes, D.W. Miller, B. E. Norum, F. W. Hersman, J.A. Carr, William Bertozzi, B. L. Berman, J. M. Finn, W.P. Jones, G.T. Emery, James J. Kelly, F. Petrovich, C. C. Foster, C. E. Hyde-Wright, and T. N. Buti
Subjects: Physics, Nuclear and High Energy Physics, Scattering, Nuclear Theory, Transition density, Neutron, State (functional analysis), Atomic physics, Nuclear Experiment, Envelope (waves)
Abstract: Scattering of 135 MeV protons is used to fit an expansion in radial basis functions of the neutron transition density for the lowest 2 + state of 18 O. The narrow error envelope shows good radial sensitivity. The results are consistent with electromagnetic decay data for the mirror transition in 18 Ne.
Published: 1986

128. A test of the interacting boson approximation using electron scattering

Author: J. B. Bellicard, C. P. Sargent, C. E. Hyde-Wright, J. Lichtenstadt, William Bertozzi, F. W. Hersman, M.V. Hynes, S. Kowalski, M. A. Kovash, James J. Kelly, T. N. Buti, J. M. Finn, B. Pugh, B. Murdock, F.N. Rad, and R. Lourie
Subjects: Physics, Nuclear and High Energy Physics, Quadrupole, Form factor (quantum field theory), Charge (physics), Interacting boson model, Atomic physics, Scalar boson, Electron scattering, Excitation, Boson
Abstract: New electron scattering data are presented for levels of 154 Gd. The study includes the three lowest-lying 2 + levels at 0.123, 0.816, and 0.996 MeV excitation energies. These data provide a test of the Interacting Boson Approximation (IBA) prediction that three electric quadrupole transition charge densities are clearly dependent. Deviation of the experimental densities from linear dependence is presented and discussed.
Published: 1983

129. Inelastic electron scattering from collective levels ofGd154

Author: J. B. Bellicard, C. P. Sargent, F.N. Rad, William Bertozzi, C. E. Hyde-Wright, M.V. Hynes, M. A. Kovash, T. N. Buti, S. Kowalski, J. Lichtenstadt, B. Murdock, R. W. Lourie, J. M. Finn, B. Pugh, James J. Kelly, and F. W. Hersman
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Scattering, Excited state, Quasiparticle, Electron, Inelastic scattering, Atomic physics, Electron scattering, Excitation
Abstract: Differential cross sections for elastic and inelastic scattering of electrons by /sup 154/Gd have been measured for states below 1 MeV of excitation. Levels of three major collective bands are studied: the 0/sup +/, 2/sup +/, 4/sup +/, and 6/sup +/ rotational states; the 2/sup +/ gamma vibration; and the 0/sup +/ and 2/sup +/ beta vibrational levels. This study includes the first electron scattering measurements of a beta vibration. Extraction of these small inelastic cross sections required improvements in momentum resolution and detector response uniformity. Data from the rotational band are compared with axially symmetric Hartree-Fock predictions. Disagreement between the measurements and Legendre projections of the calculated density, particularly for higher multipolarity states, indicates a breakdown in the Hartree-Fock approximation or the rotational model. Small amplitude vibrations of the nuclear shape derived from the measured rotational densities agree well in shape when independently normalized to the cross section strength for both the beta and gamma 2/sup +/ vibrations, substantiating their geometrical interpretations. Once transition strength of the beta band is set, however, the strength and shape of the 0/sup +/ beta is not correctly predicted, indicating a more complicated configuration.
Published: 1986

130. Missing-energy dependence of the separated response functions for theC12(e,e’p) reaction

Author: P. E. Ulmer, John M. Finn, E. J. Winhold, S. Kowalski, J. R. Calarco, J. Nelson, C. E. Hyde-Wright, Nasser Kalantar-Nayestanaki, H. Baghaei, K. I. Blomqvist, M. Yamazaki, F. W. Hersman, R. W. Lourie, G. Audit, W. W. Sapp, B. H. Cottman, James J. Kelly, P. K. Teng, C. P. Sargent, Martin Schulze, William Bertozzi, and Larry Weinstein
Subjects: Physics, Baryon, Chemical kinetics, Nuclear reaction, Missing energy, Hadron, General Physics and Astronomy, Elementary particle, Atomic physics, Nucleon, Charged particle
Published: 1987

131. Nuclear charge densities in the transition region: 192Os

Author: T. Millimanp, J. M. Finn, M.V. Hoehn, W. Reuter, E.B. Shera, B. Pugh, C. E. Hyde-Wright, F. W. Hersman, R. W. Lourie, and William Bertozzi
Subjects: Physics, Nuclear reaction, Elastic scattering, Nuclear and High Energy Physics, Binding energy, Hartree–Fock method, Charge density, Atomic physics, Interacting boson model, Inelastic scattering, Effective nuclear charge
Abstract: Data from the first electron-scattering study of an Os-Pt transition region nucleus, 192 Os, are analyzed in combination with moonic-atom data by using the model-independent Fourier-Bessel method. The results are discussed in terms of available IBA and BET model calculations. New Hartree-Fock (DME) calculations are presented as an example of the agreement achieved with microscopic-based theories.
Published: 1984

132. Density dependence in the two-nucleon effective interaction at 135 MeV

Author: B. Pugh, W.P. Jones, M.V. Hynes, F.N. Rad, D.W. Miller, A. D. Bacher, B. L. Berman, F. W. Hersman, T. N. Buti, Michael A. Kovash, B. E. Norum, G.T. Emery, James J. Kelly, W. G. Love, C. E. Hyde-Wright, J. A. Carr, F. Petrovich, B. Murdock, John M. Finn, William Bertozzi, and C. C. Foster
Subjects: Nuclear physics, Physics, Elastic scattering, Nuclear and High Energy Physics, Angular momentum, Isoscalar, Nuclear Theory, Momentum transfer, Nuclear structure, Atomic physics, Inelastic scattering, Nucleon, Nuclear matter
Abstract: Differential cross sections and analyzing powers for scattering of 135-MeV protons by /sup 16/O have been measured for all narrow states below 12.1 MeV of excitation up to a momentum transfer of 3.2 fm/sup -1/. Calculations that employ accurate transition densities fitted to electroexcitation data are used to study medium modifications to the two-nucleon effective interaction with little residual uncertainty from nuclear structure. Definitive evidence for strong density dependence in the isoscalar spin-independent central component of the two-nucleon effective interaction has been found. The differential cross sections show that as the density increases, the strength of the central interaction is suppressed at low momentum transfer and enhanced at high momentum transfer. The analyzing powers exhibit strong negative excursions near 2.5 fm/sup -1/, which support enhanced repulsion at high density. The data are well described by the local-density approximation, which employs the nuclear-matter effective interaction appropriate to the density in the vicinity of the interacting nucleons. We find that the qualitative results are insensitive to ambiguities in the local-density prescription, the local-exchange approximation, and the choice of distorted waves. However, effective interactions based upon the Paris, Bonn, and Hamada-Johnston potentials do give substantially different results. Of these, the Paris-Hamburg effective interactionmore » provides the best description of normal-parity isoscalar transitions. The analysis also supports a rearrangement contribution to the effective interaction for inelastic scattering.« less
Published: 1989

133. High-resolution inelastic electron scattering fromO17

Author: J. M. Finn, William Bertozzi, M.V. Hynes, M. A. Kovash, James J. Kelly, D. M. Manley, B. E. Norum, R. W. Lourie, F. W. Hersman, B. L. Berman, C. P. Sargent, B. Pugh, B. Murdock, T. N. Buti, S. Kowalski, and C. E. Hyde-Wright
Subjects: Nuclear reaction, Oxygen-17, Physics, Nuclear and High Energy Physics, Angular momentum, Scattering, Excited state, Quadrupole, Momentum transfer, Inelastic scattering, Atomic physics
Abstract: Excited states of $^{17}\mathrm{O}$ up to an excitation energy of 15 MeV have been studied by high-resolution electron scattering for momentum transfers between 0.8 and 2.6 ${\mathrm{fm}}^{\mathrm{\ensuremath{-}}1}$. Previous electron-scattering measurements in this excitation region were confined to momentum transfers below 1.1 ${\mathrm{fm}}^{\mathrm{\ensuremath{-}}1}$ and were of lower resolution. Form factors were measured and reduced transition probabilities determined for most excited states below 9.5 MeV. The present data are interpreted within the framework of weak-coupling models to facilitate a simple description of the observed spectrum. Particular emphasis is placed upon understanding states that are excited strongly by electric quadrupole or octupole transitions. Spins and parities have been assigned for several levels that have very narrow widths and, hence, are not amenable to partial-wave analyses involving the $^{16}$O+n and $^{13}$C+\ensuremath{\alpha} reactions. Levels at 5.87 MeV (${(3/2}^{+}$), 6.86 MeV (${(5/2}^{+}$), 7.58 MeV (${(7/2}^{+}$), and 8.47 MeV (${(9/2}^{+}$) are suggested as candidates for predominantly 5p-4h members of a ${K}^{\ensuremath{\pi}}$${=(3/2}^{+}$ rotational band. A narrow state (\ensuremath{\Gamma}\ensuremath{\le}20 keV) at 12.22\ifmmode\pm\else\textpm\fi{}0.02 MeV was observed for the first time and the existence of narrow states at 8.90\ifmmode\pm\else\textpm\fi{}0.02 and 14.72\ifmmode\pm\else\textpm\fi{}0.02 MeV was confirmed.
Published: 1987

134. Cross section and analyzing power for the isovector 'stretched' 6− state in the 28Si(p, n)28P reaction

Author: Peter C. Tandy, C. C. Foster, T. N. Buti, C. E. Hyde-Wright, B. D. Anderson, C. Lebo, William Bertozzi, A. Fazely, M. A. Kovash, B. Pugh, J. W. Watson, Richard Madey, A. R. Baldwin, James J. Kelly, B. Murdock, and M. Finn
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Cross section (physics), Amplitude, Isovector, Charge (physics), State (functional analysis), Atomic physics, Nuclear Experiment, Electron scattering, Excitation
Abstract: We studied the 28 Si(p, n) reaction with both unpolarized and polarized protons at a nominal energy of 135 MeV, extracted the angular distributions of the differential cross section and the analyzing power for the 6 − , T = 1 state at an excitation energy of 4.95 MeV in 28 P, and compared our results with similar data published for the analog ( p , p ′) reaction to the 6 − , T = 1 state at an excitation energy of 14.35 MeV in 28 Si. These comparisons are consistent with charge independence. The measurements are described well by distorted-wave-impulse-approximation calculations with form factors and spectroscopic amplitudes determined from electron scattering.
Published: 1985

135. Inconsistency of hexadecapole matrix elements for180Hf as extracted from nuclear and leptonic scattering

Author: J. H. Hamilton, Charles Maguire, J M Finn, R B Piercey, R. Soundranayagam, W Bertozzi, C. E. Hyde-Wright, H. Baghaei, and T. N. Buti
Subjects: Physics, Elastic scattering, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, Matrix (mathematics), Scattering, Excited state, General Physics and Astronomy, Inelastic scattering, Atomic physics, Electron scattering, Excitation
Abstract: Electron scattering on a highly enriched 180Hf target has been carried out at the Bates Linear Accelerator Center. Elastic and inelastic cross sections were measured at lab energies of 115, 130, 160, 240 and 280 MeV incident energy. Excitation of the 0+, 2+, 4+ ground-state rotational band members and 1.181(2+'), 1.386(3-), 1.621(5-), 1.693(2+") and 1.890 MeV(3-') states were observed. The analysis of the ground-band data yielded values of the transition matrix elements, M02 and M04, of 2.29(1) eb and 0.128(5) eb2, respectively. The M04 value is inconsistent with the large negative value (-0.67 eb2) obtained from ( alpha , alpha ') sub-Coulomb and Coulomb-nuclear interference studies of 180Hf. Possible origins of this difference are presented.
Published: 1988

136. Electroexcitation of4−states inO16

Author: Michael A. Kovash, J. A. Carr, John M. Finn, C. P. Sargent, B. L. Berman, R. W. Lourie, M.V. Hynes, B. E. Norum, F. Petrovich, William Bertozzi, C. E. Hyde-Wright, T. N. Buti, B. Pugh, F. W. Hersman, James J. Kelly, S. Kowalski, and J. Lichtenstadt
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Isovector, Isoscalar, Isospin, Hadron, Form factor (quantum field theory), Charge density, Inelastic scattering, Atomic physics, Ground state
Abstract: We report electron scattering form factors for known 4/sup -/ states in /sup 16/O at 17.79 and 18.98 MeV. We also report statistical upper bounds for the 4/sup -/ state at 19.80 MeV. The ratios of these form factors are consistent with the isospin amplitudes derived from pion scattering data. The form factors of levels observed in (e,e') at 17.880 +- 0.015, 18.635 +- 0.020, and 20.510 +- 0.025 MeV are compatible with 4/sup -/ T = 1 assignments. Existing (..pi..,..pi..') and (p,p') spectra do not contradict these identifications. The 4/sup -/ form factors are well described by a harmonic-oscillator density with oscillator length b = 1.58 fm. This value is substantially smaller than the value of 1.77 fm obtained from the ground state charge density. The form factor of the 18.98 MeV state can also be fitted by a Woods-Saxon transition density, with parameters fitted to the elastic M5 multipole of /sup 17/O. The fit is improved by inclusion of meson-exchange currents. However, the isoscalar-isovector differences in the Woods-Saxon plus meson-exchange current form factors result in a poor fit to the 17.79 MeV state. The total isovector and isoscalar strengths observed for the established 4/sup -/ states are 41%more » and 23%, respectively, of a pure single-particle prediction.« less
Published: 1987

137. Search for a doublet inO16near 9.85 MeV

Author: R. W. Lourie, C. E. Hyde-Wright, Michael A. Kovash, D. G. Marchlenski, and R. G. Seyler, H. R. Suiter, J. C. Brown, and W. Pugh
Subjects: Nuclear reaction, Elastic scattering, Physics, Nuclear and High Energy Physics, Angular momentum, Isotope, Scattering, Atomic physics, Tetrahedral symmetry, Excitation, Oxygen-16
Abstract: The region of excitation in /sup 16/O near 9.85 MeV has been investigated for evidence of a doublet, expected from tetrahedral symmetry arguments, by using the /sup 12/C(/sup 4/He,..gamma../sub 3/)/sup 16/O and /sup 12/C(/sup 4/He,/sup 4/He)/sup 12/C reactions. Energy-matched measurements of the pair of reactions show no evidence for cascade gamma-ray decay of any but the known D-wave resonance observed in the elastic channel. The gamma-ray decay width of a possible second nondegenerate level to the 2/sub 1//sup +/ state is determined to be less than 5 x 10/sup -4/ eV.
Published: 1985

138. Ground-state and transition charge densities inOs192

Author: W. Reuter, John M. Finn, William Bertozzi, C. E. Hyde-Wright, T. Milliman, R. W. Lourie, B. Pugh, E.B. Shera, M.V. Hoehn, and F. W. Hersman
Subjects: Elastic scattering, Physics, Nuclear reaction, Nuclear and High Energy Physics, Angular momentum, Momentum transfer, Charge density, Inelastic scattering, Atomic physics, Ground state, Legendre polynomials
Abstract: Elastic and inelastic electron-scattering cross sections of an Os-Pt transition region nucleus, /sup 192/Os, have been measured in a momentum transfer range from 0.6 to 2.9 fm/sup -1/. The data for the ground and the J/sup ..pi../ = 2/sup +/, 2/sup +/', 4/sup +/, and 3/sup -/ states were analyzed model independently with a Fourier-Bessel parametrization of the ground state and transition charge densities. The normalization of the (e,e') cross sections was obtained from a combined analysis with muonic-atom data for the ground and first 2/sup +/ states. The densities and their radial moments are compared with theoretical predictions of the Davydov model and with axially symmetric deformed density-matrix-expansion Hartree-Fock calculations (including the Legendre expansion and the small-amplitude vibration model extensions).
Published: 1984

139. Electroproduction of the Λ(1520) hyperon

Author: L. Farhi, C. Marchand, V. Sapunenko, S. K. Matthews, J. Domingo, E. Wolin, Baile Zhang, Gerard Gilfoyle, J. P. Ball, R. Fatemi, C. Djalali, A. V. Vlassov, D. Doughty, K. S. Egiyan, K. Mikhailov, W. Kim, B. Carnahan, R. W. Major, G. Ricco, P. Stoler, Sylvain Bouchigny, M. D. Mestayer, M. Lucas, M. Eckhause, Jochen Heisenberg, D. Heddle, S. O. Nelson, K. Hicks, D. G. Crabb, G. V. O'Rielly, G. A. Peterson, M. Spraker, R. A. Miskimen, Philip L. Cole, S. Dytman, Thierry Auger, D. Rowntree, V. Muccifora, S. Barrow, G. Asryan, R. A. Niyazov, John T. O'Brien, S. Boiarinov, Michael Dugger, A. R. Reolon, E. Polli, R. C. Minehart, C. A. Meyer, Moshe Gai, P. Corvisiero, S. Stepanyan, D. Branford, J. J. Manak, A. Longhi, M. Guidal, D. G. Jenkins, K. Sabourov, M. Mirazita, Friedrich Klein, R. S. Hicks, Brian Raue, G. Niculescu, J. M. Laget, J. P. Cummings, Dinko Pocanic, S. E. Kuhn, P. Dragovitsch, J. H. Kelley, J. R. Calarco, M. Holtrop, L. Y. Murphy, Volker D. Burkert, A. S. Biselli, Jing Zhao, V. Frolov, M. J. Amaryan, Michael Vineyard, M. Sanzone-Arenhovel, R. A. Demirchyan, F. Sabatié, M. M. Ito, M. Kossov, K. Paschke, Elton Smith, J. Hardie, B. M. Preedom, Laird Kramer, J. Ficenec, L. Ciciani, M. Anghinolfi, K. Beard, A.V. Stavinsky, James Mueller, Federico Ronchetti, N. Pivnyuk, Kalvir S. Dhuga, M. Klusman, P. D. Rubin, G. Capitani, F. W. Hersman, D. J. Tedeschi, J. Napolitano, Y. G. Sharabian, P. Rossi, S. A. Philips, J. Shaw, G. Gavalian, K. L. Giovanetti, B. Asavapibhop, C. Salgado, Larry Weinstein, J. S. McCarthy, S. Pozdniakov, E. Anciant, Z. L. Zhou, Daniel S. Carman, V. B. Gavrilov, G. Audit, A. K. Opper, G. Riccardi, M. Khandaker, Barry Ritchie, R. DeVita, M. Bektasoglu, J. W C McNabb, T. Y. Tung, R. A. Schumacher, Y. Kuang, K. Wang, T. A. Forest, Avraham Klein, G. E. Dodge, P. V. Degtyarenko, K. Kim, I. Niculescu, D. Lawrence, Hall Crannell, Y. V. Efremenko, S. Taylor, G. S. Adams, K. Joo, D. P. Weygand, S. McAleer, J. Hu, J. W. Price, M. Ripani, M. Battaglieri, D. I. Sober, K. Lukashin, E. DeSanctis, M. Witkowski, Bernhard Mecking, Y. Patois, Roy Thompson, A. V. Skabelin, G. S. Mutchler, H. Egiyan, K. A. Griffioen, C. S. Whisnant, M. Taiuti, Shalev Gilad, R. J. Feuerbach, J. Yun, D. Cords, D. Hancock, G. A. Leksin, L. C. Smith, S. J. Gaff, A. Yegneswaran, N. Bianchi, H. R. Weller, Airton Deppman, V. Gyurjyan, J. Connelly, L.C. Dennis, Herbert O. Funsten, S. M. Shuvalov, M. Guillo, A. Coleman, L. Elouadrhiri, W. K. Brooks, L. M. Qin, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, K. Y. Kim, K. Park, R. Clark, A. Empl, O. Pogorelko, T. Smith, C. E. Hyde-Wright, A. Weisberg, Patrick Girard, and V. S. Serov
Subjects: Physics, Baryon, Nuclear physics, Nuclear and High Energy Physics, Meson, Yield (chemistry), Hyperon, Production (computer science), Atomic physics, Coupling (probability), Lambda, Helicity
Abstract: The reaction ep{yields}e'K{sup +}{Lambda}(1520) with {Lambda}(1520){yields}p'K{sup -} was studied at electron beam energies of 4.05, 4.25, and 4.46 GeV, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cos {theta}{sub K{sup +}}, {phi}{sub K{sup +}}, Q{sup 2}, and W dependencies of {Lambda}(1520) electroproduction are presented for the kinematic region 0.9

140. Photoproduction of the ω meson on the proton at large momentum transfer

Author: M. Battaglieri, M. Brunoldi, R. De Vita, J. M. Laget, M. Osipenko, M. Ripani, M. Taiuti, G. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, D. S. Armstrong, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, S. Barrow, K. Beard, M. Bektasoglu, B. L. Berman, A. Bersani, N. Bianchi, A. S. Biselli, S. Boiarinov, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, J. R. Calarco, G. P. Capitani, D. S. Carman, B. Carnahan, A. Cazes, C. Cetina, P. L. Cole, A. Coleman, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. DeSanctis, P. V. Degtyarenko, R. Demirchyan, H. Denizli, L. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, L. Farhi, R. J. Feuerbach, J. Ficenec, T. A. Forest, A. P. Freyberger, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, M. Garcon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, E. Golovach, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, C. E. Hyde-Wright, M. M. Ito, K. Joo, J. H. Kelley, M. Khandaker, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, S. E. Kuhn, J. Lachniet, D. Lawrence, M. Lucas, K. Lukashin, R. W. Major, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, S. Morrow, M. U. Mozer, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, S. O. Nelson, S. Niccolai, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, J. T. O’Brien, A. K. Opper, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, D. Protopopescu, L. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, B. G. Ritchie, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, K. Sabourov, C. Salgado, V. Sapunenko, R. A. Schumacher, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, A. V. Skabelin, E. S. Smith, T. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, P. Stoler, S. Taylor, D. J. Tedeschi, L. Todor, U. Thoma, R. Thompson, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. Wood, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, and Z. Zhou
Subjects: Physics, Particle physics, Proton, Meson, Hadron, Momentum transfer, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, Gluon, High Energy Physics - Experiment, Nuclear physics, Baryon, Pion, High Energy Physics::Experiment, Nucleon, Nuclear Experiment
Abstract: The differential cross section, $d\sigma/dt$ for $\omega$ meson exclusive photoproduction on the proton above the resonance region ($2.6, Comment: 5 pages, 5 figures

141. Observation of an Exotic S = +1 Baryon in Exclusive Photoproduction from the Deuteron

Author: R. J. Feuerbach, D. Heddle, M. Battaglieri, P. Eugenio, J. Lachniet, D. Rowntree, L. Todor, D. Protopopescu, M. Taiuti, G. Gavalian, V. Mokeev, S. Pozdniakov, M. Garçon, Latifa Elouadrhiri, R. C. Minehart, I. I. Strakovsky, R. Bradford, S. A. Morrow, R. S. Hakobyan, C. A. Meyer, G. V. O'Rielly, J. P. Cummings, R. De Vita, C. Djalali, M. Kossov, Rakhsha Nasseripour, R. W. Gothe, J. Ficenec, L. Ciciani, S. A. Philips, Hall Crannell, P. Ambrozewicz, W. Kim, L. C. Smith, V. Gyurjyan, D. G. Jenkins, W. K. Brooks, K. Livingston, D. P. Weygand, K. Y. Kim, S. Simionatto, P. Dragovitsch, Alexei V. Klimenko, H. Bagdasaryan, A. K. Opper, Shifeng Chen, K. L. Giovanetti, B. Asavapibhop, K. A. Griffioen, Michael Vineyard, S. Stepanyan, B. Carnahan, S. McAleer, Barry Ritchie, Sylvain Bouchigny, Larry Weinstein, G. A. Peterson, Bernhard Mecking, Daniel S. Carman, K. V. Dharmawardane, P. Rossi, P. Heimberg, E. Anciant, G. E. Dodge, L. Guo, M. Ungaro, H. Avakian, G. Audit, C. E. Hyde-Wright, S. Barrow, Ji Li, J. Hardie, M. Ripani, M. D. Mestayer, Y. Kuang, G. Riccardi, J. W C McNabb, Federico Ronchetti, P. V. Degtyarenko, K. Kim, M. Khandaker, J. Kuhn, Cynthia Marie Hadjidakis, J. R. Calarco, P. L. Cole, A. Coleman, H. R. Weller, E. Polli, S. Niccolai, H. Denizli, G. Ricco, Michael Dugger, K. Joo, M. Osipenko, Roy Thompson, F. Sabatié, Dinko Pocanic, M. Bektasoglu, J. W. Price, P. Stoler, A.V. Stavinsky, H. O. Funsten, S. Boiarinov, B. M. Preedom, B. B. Niczyporuk, I. Niculescu, D. Lawrence, J. Yun, D. Cords, N. Pivnyuk, A. Yegneswaran, J. Napolitano, B. L. Berman, K. Beard, L. M. Qin, Nicola Bianchi, D. J. Tedeschi, J. P. Santoro, R. Suleiman, G. S. Adams, K. Hicks, J. Hu, S. E. Kuhn, Kalvir S. Dhuga, A. V. Skabelin, R. A. Schumacher, M. Guidal, G. S. Mutchler, G. Niculescu, W. J. Briscoe, E. Pasyuk, J. J. Melone, K. Wang, K. S. Egiyan, Friedrich Klein, C. Tur, R. S. Hicks, Stephen Taylor, M. Klusman, F. W. Hersman, C. Salgado, C. S. Whisnant, M. Holtrop, S. A. Dytman, M. Nozar, C. I O Gordon, Brian Raue, K. Mikhailov, L.C. Dennis, M. Guillo, Elton Smith, U. Thoma, M. M. Ito, L. Morand, T. A. Forest, Avraham Klein, M. Anghinolfi, O. P. Dzyubak, R. A. Niyazov, James Mueller, John T. O'Brien, J. Shaw, P. D. Rubin, Y. G. Sharabian, P. Corvisiero, Michael Wood, V. S. Serov, M. Bellis, K. Park, V. P. Kubarovsky, A. Empl, O. Pogorelko, K. Lukashin, Laird Kramer, A. C S Lima, Volker D. Burkert, A. S. Biselli, J. D. Kellie, L. Y. Murphy, S. Mehrabyan, C. Butuceanu, E. Wolin, J. P. Ball, Y. Prok, D. G. Crabb, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, Hovanes Egiyan, R. A. Miskimen, H. G. Juengst, D. Branford, M. Mirazita, E. De Sanctis, D. I. Sober, R. Fatemi, A. V. Vlassov, J. J. Manak, D. Doughty, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, and Robert, Suzanne
Subjects: Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Meson, Hadron, Hyperon, FOS: Physical sciences, General Physics and Astronomy, Strangeness, Pentaquark, High Energy Physics - Experiment, Nuclear physics, Baryon, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Exotic baryon, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Invariant mass, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment
Abstract: In an exclusive measurement of the reaction $\gamma d \to K^+ K^- p n$, a narrow peak that can be attributed to an exotic baryon with strangeness $S=+1$ is seen in the $K^+n$ invariant mass spectrum. The peak is at $1.542\pm 0.005$ GeV/c$^2$ with a measured width of 0.021 GeV/c$^2$ FWHM, which is largely determined by experimental mass resolution. The statistical significance of the peak is $5.2 \pm 0.6 \sigma$. The mass and width of the observed peak are consistent with recent reports of a narrow $S=+1$ baryon by other experimental groups., Comment: 5 pages, 5 figures

142. ReactionC12(e,e′p)in the Dip Region

Author: C. E. Hyde-Wright, K. I. Blomqvist, J. Nelson, M. Yamazaki, F. W. Hersman, B. H. Cottman, C. P. Sargent, James J. Kelly, E. J. Winhold, P. E. Ulmer, S. Kowalski, J. R. Calarco, W.W. Sapp, P. K. Teng, Martin Schulze, Joseph B. Wiggins, William Bertozzi, Nasser Kalantar-Nayestanaki, R. W. Lourie, J. M. Finn, and H. Baghaei
Subjects: Parallel kinematics, Nuclear reaction, Physics, Angular distribution, Scattering, Nuclear Theory, General Physics and Astronomy, Atomic physics, Nuclear Experiment, Omega, Spectral line
Abstract: The reaction $^{12}\mathrm{C}(e,{e}^{\ensuremath{'}}p)$ in the dip region ($\ensuremath{\omega}=200 \mathrm{MeV}, \mathrm{q}=400 \mathrm{Mev}c$) has been measured in parallel kinematics for missing energies up to 160 MeV. A coincidence yield considerably larger than that expected for a one-body reaction process is observed, though the one-body contribution from $p$- and $s$-shell knockout is also present. A uniform continuum strength extends from beyond the $p$ shell to the highest measured missing energies. This continuum strength is the dominant contribution to the ($e,{e}^{\ensuremath{'}}p$) reaction process in the dip region.
Published: 1986

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