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1. Measurement of the neutron electric to magnetic form factor ratio at Q2 = 1.58 GeV2 using the reaction 3He(e,e'n)pp

Author

Schlimme, B. S., Achenbach, P., Gayoso, C. A. Ayerbe, Bernauer, J. C., Böhm, R., Bosnar, D., Challand, Th., Distler, M. O., Doria, L., Fellenberger, F., Fonvieille, H., Rodríguez, M. Gómez, Grabmayr, P., Hehl, T., Heil, W., Kiselev, D., Krimmer, J., Makek, M., Merkel, H., Middleton, D. G., Müller, U., Nungesser, L., Ott, B. A., Pochodzalla, J., Potokar, M., Majos, S. Sánchez, Sargsian, M. M., Sick, I., Širca, S., Weinriefer, M., Wendel, M., and Yoon, C. J.

Subjects
Nuclear Experiment
Abstract

A measurement of beam helicity asymmetries in the reaction 3He(e,e'n)pp has been performed at the Mainz Microtron in quasielastic kinematics in order to determine the electric to magnetic form factor ratio of the neutron, GEn/GMn, at a four momentum transfer Q2 = 1.58 GeV2. Longitudinally polarized electrons were scattered on a highly polarized 3He gas target. The scattered electrons were detected with a high-resolution magnetic spectrometer, and the ejected neutrons with a dedicated neutron detector composed of scintillator bars. To reduce systematic errors data were taken for four different target polarization orientations allowing the determination of GEn/GMn from a double ratio. We find mu_n GEn/GMn = 0.250 +/- 0.058(stat.) +/- 0.017 (sys.).

Published
2013
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2. Knockout of proton-neutron pairs from $^{16}$O with electromagnetic probes

Author

Middleton, D. G., Annand, J. R. M., Barbieri, C., Giusti, C., Grabmayr, P., Hehl, T., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Moschini, F., Pacati, F. D., Schwamb, M., and Watts, D.

Subjects
Nuclear Experiment
Abstract

After recent improvements to the Pavia model of two-nucleon knockout from $^{16}$O with electromagnetic probes the calculated cross sections are compared to experimental data from such reactions. Comparison with data from a measurement of the $^{16}$O(e,e$'$pn) reaction show much better agreement between experiment and theory than was previously observed. In a comparison with recent data from a measurement of the $^{16}$O($\gamma$,pn) reaction the model over-predicts the measured cross section at low missing momentum., Comment: 6 pages, 5 figures

Published
2009
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3. Investigation of the Exclusive ^{3}He(e,e'pn)p Reaction

Author

Middleton, D. G., Annand, J. R. M., Antelo, M. Ases, Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., Bosnar, D., Böhm, R., Ding, M., Distler, M. O., Friedrich, J., Llongo, J. García, Glazier, D. I., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., Kamada, H., Mañas, G. Jover, Kohl, M., Lapikás, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Benito, R. Pérez, Pospischil, Th., Potokar, M., Rosner, G., Seimetz, M., Skibiński, R., de Vries, H., Walcher, Th., Watts, D. P., Weinriefer, M., Weiss, M., Witała, H., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

Cross sections for the ^{3}He(e,e'pn)p reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming much smaller at higher recoil momentum., Comment: 5, pages, 3 figures

Published
2009
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4. First measurements of the ^16O(e,e'pn)^14N reaction

Author

Middleton, D. G., Annand, J. R. M., Barbieri, C., Barneo, P., Bartsch, P., Bauman, D., Bermuth, J., Bosnar, D., Blok, H. P., Bohm, R., Ding, M., Distler, M. O., Elsner, D., Friedrich, J., Giusti, C., Glazier, D. I., Grabmayr, P., Grozinger, S., Hehl, T., Heim, J., Hesselink, W. H. A, Jans, E., Klein, F., Kohl, M., Lapikas, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Moschini, F., Muller, U., Pospischil, Th., Rosner, G., Schmieden, H., Seimetz, M., Sule, A., de Vries, H., Walcher, Th., Watts, D. P., Weis, M., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

This paper reports on the first measurement of the ^16O(e,e'pn)^14N reaction. Data were measured in kinematics centred on a super-parallel geometry at energy and momentum transfers of 215 MeV and 316 MeV/c. The experimental resolution was sufficient to distinguish groups of states in the residual nucleus but not good enough to separate individual states. The data show a strong dependence on missing momentum and this dependence appears to be different for two groups of states in the residual nucleus. Theoretical calculations of the reaction using the Pavia code do not reproduce the shape or the magnitude of the data., Comment: 10 pages, 11 figures, 2 tables, Accepted for publication in EPJA

Published
2007
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5. Measurement of the pi^+ meson polarizabilities via the gamma p->gamma pi^+ n reaction

Author

Ahrens, J., Alexeev, V. M., Annand, J. R. M., Arends, H. J., Beck, R., Caselotti, G., Cherepnya, S. N., Drechsel, D., Fil'kov, L. V., F"ohl, K., Giller, I., Grabmayr, P., Hehl, T., Hornidge, D., Kashevarov, V. L., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., McGeorge, J. C., MacGregor, I. J. D., Metag, V., Moinester, M., Novotny, R., Pfeiffer, M., Rost, M., Schadmand, S., Scherer, S., Thomas, A., Unkmeir, C., and Walcher, Th.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Theory
Abstract

An experiment on the radiative pi^+ meson photoproduction from the proton (gamma p->gamma pi^+ n) was carried out at the Mainz Microtron MAMI in the kinematic region 537 MeV

Published
2004
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6. Three-nucleon mechanisms in photoreactions

Author

Watts, D. P., Ahrens, J., Annand, J. R. M, Beck, R., Branford, D., Grabmayr, P., Hehl, T., Kellie, J. D., MacGregor, I. J. D., McGeorge, J. C., and Owens, R. O.

Subjects
Nuclear Experiment
Abstract

The $^{12}$C$(\gamma,ppn)$ reaction has been measured for E$_{\gamma}$=150-800 MeV in the first study of this reaction in a target heavier than $^3$He. The experimental data are compared to a microscopic many body calculation. The model, which predicts that the largest contribution to the reaction arises from final state interactions following an initial pion production process, overestimates the measured cross sections and there are strong indications that the overestimate arises in this two-step process. The selection of suitable kinematic conditions strongly suppresses this two-step contribution leaving cross sections in which up to half the yield is predicted to arise from the absorption of the photon on three interacting nucleons and which agree with the model. The results indicate $(\gamma,3N)$ measurements on nuclei may be a valuable tool for obtaining information on the nuclear three-body interaction., Comment: 5 pages, 3 figures

Published
2002
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7. Compton Scattering by the Proton using a Large-Acceptance Arrangement

Author

Wolf, S., Lisin, V., Kondratiev, R., Massone, A. M., Galler, G., Ahrens, J., Arends, H. -J., Beck, R., Camen, M., Capitani, G. P., Grabmayr, P., Härter, F., Hehl, T., Jennewein, P., Kossert, K., L'vov, A. I., Molinari, C., Ottonello, P., Owens, R. O., Peise, J., Preobrajenskij, I., Proff, S., Robbiano, A., Sanzone, M., Schumacher, M., Schmitz, M., and Wissmann, F.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

Compton scattering by the proton has been measured using the tagged-photon facility at MAMI (Mainz) and the large-acceptance arrangement LARA. The new data are interpreted in terms of dispersion theory based on the SAID-SM99K parameterization of photo-meson amplitudes. It is found that two-pion exchange in the t-channel is needed for a description of the data in the second resonance region. The data are well represented if this channel is modeled by a single pole with mass parameter m(sigma)=600 MeV. The asymptotic part of the spin dependent amplitude is found to be well represented by pi-0-exchange in the t-channel. A backward spin-polarizability of gamma(pi)=(-37.1+-0.6(stat+syst)+-3.0(model))x10^{-4}fm^4 has been determined from data of the first resonance region below 455 MeV. This value is in a good agreement with predictions of dispersion relations and chiral pertubation theory. From a subset of data between 280 and 360 MeV the resonance pion-photoproduction amplitudes were evaluated leading to a E2/M1 multipole ratio of the p-to-Delta radiative transition of EMR(340 MeV)=(-1.7+-0.4(stat+syst)+-0.2(model))%. It was found that this number is dependent on the parameterization of photo-meson amplitudes. With the MAID2K parameterization an E2/M1 multipole ratio of EMR(340 MeV)=(-2.0+-0.4(stat+syst)+-0.2(model))% is obtained.

Published
2001
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8. Compton Scattering by the Proton

Author

Galler, G., Lisin, V., Kondratiev, R., Massone, A. M., Wolf, S., Ahrens, J., Arends, H. -J., Beck, R., Camen, M., Capitani, G. P., Grabmayr, P., Hall, S. J., Härter, F., Hehl, T., Jennewein, P., Kossert, K., L'vov, A. I., Molinari, C., Ottonello, P., Peise, J., Preobrajenski, I., Proff, S., Robbiano, A., Sanzone, M., Schumacher, M., Schmitz, M., and Wissmann, F.

Subjects
Nuclear Experiment, High Energy Physics - Phenomenology
Abstract

Compton scattering by the proton has been measured over a wide range covering photon energies 250 MeV < E_\gamma < 800 MeV and photon scattering angles 30^0 < \theta^{lab}_\gamma < 150^0, using the tagged-photon facility at MAMI (Mainz) and the large-acceptance arrangement LARA. The data are in good agreement with the dispersion theory based on the SAID-SM99K parameterization of photo-meson amplitudes. From the subset of data between 280 and 360 MeV the resonance pion-photoproduction amplitudes were evaluated leading to the multipole E2/M1 ratio EMR(340 MeV) =(-1.6 \pm 0.4(stat+syst) \pm 0.2(model)%. From all data below 455 MeV the proton's backward spin polarizability was determined to be \gamma_\pi=(-37.9 \pm 0.6(stat+syst) \pm 3.5(model))x10^{-4}fm^4.

Published
2001
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9. The Electric Formfactor of the Neutron Determined by Quasielastic Scattering of Longitudinally Polarized Electrons from 3He and 2D

Author

Andresen, H. G., Annand, J. R. M., Aulenbacher, K., Becker, J., Blume-Werry, J., Dombo, Th., Drescher, P., Ducret, J. E., Eyl, D., Fischer, H., Frey, A., Grabmayr, P., Hall, S., Hartmann, P., Hehl, T., Heil, W., Hoffmann, J., Kellie, J. D., Klein, F., Leduc, M., Meierhoff, M., Möller, H., Nachtigall, Ch., Ostrick, M., Otten, E. W., Owens, R. O., Plützer, S., Reichert, E., Rohe, D., Schäfer, M., Schmieden, H., Steffens, K.-H., Surkau, R., Walcher, Th., Burke, P. G., editor, Kleinpoppen, H., editor, Campbell, D. Murray, editor, and Kleinpoppen, Hans, editor

Published
1996
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12. 3He(e,e′pp) and 3He(e,e′pn) reactions at AmPS and MAMI

Author

Middleton, D. G., Annand, J. R. M., Ases Antelo, M., Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., Böhm, R., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., García Llongo, J., Glazier, D. I., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., Jover Mañas, G., Kohl, M., Lapikás, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Pérez Benito, R., Pospischil, Th., Potokar, M., Rosner, G., Seimitz, M., de Vries, H., Walcher, Th., Watts, D. P., Weinriefer, M., Weiss, M., and Zihlmann, B.

Published
2008
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13. First measurements of the 16O(e, e'pn)14N reaction

Author

Middleton, D. G., Annand, J. R. M., Barbieri, C., Barneo, P., Blok, H. P., Böhm, R., Distler, M. O., Friedrich, J., Giusti, C., Glazier, D. I., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., Kohl, M., Lapikás, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Moschini, F., Rosner, G., Seimetz, M., de Vries, H., Walcher, Th., Watts, D. P., and Zihlmann, B.

Published
2006
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14. Measurement of the πmeson polarizabilities via the γp → γπ+n reaction

Author

Ahrens, J., Alexeev, V. M., Annand, J. R. M., Arends, H. J., Beck, R., Caselotti, G., Cherepnya, S. N., Drechsel, D., Fil’kov, L. V., Föhl, K., Giller, I., Grabmayr, P., Hehl, T., Hornidge, D., Kashevarov, V. L., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., McGeorge, J. C., MacGregor, I. J. D., Metag, V., Moinester, M., Novotny, R., Pfeiffer, M., Rost, M., Schadmand, S., Scherer, S., Thomas, A., Unkmeir, C., and Walcher, Th.

Published
2005
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15. Determination of the neutron electric form factor from the reaction 3 He(e,e'n) at medium momentum transfer

Author

Becker, J., Andresen, H.G., Annand, J.R.M., Aulenbacher, K., Beuchel, K., Blume–Werry, J., Dombo, Th., Drescher, P., Ebert, M., Eyl, D., Frey, A., Grabmayr, P., Großmann, T., Hartmann, P., Hehl, T., Heil, W., Herberg, C., Hoffmann, J., Kellie, J.D., Klein, F., Livingston, K., Leduc, M., Meyerhoff, M., Möller, H., Nachtigall, Ch., Natter, A., Ostrick, M., Otten, E.W., Owens, R.O., Plützer, S., Reichert, E., Rohe, D., Schäfer, M., Schmieden, H., Sprengard, R., Steigerwald, M., Steffens, K.-H., Surkau, R., Walcher, Th., Watson, R., and Wilms, E.

Published
1999
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16. Determination of the neutron electric form factor in the D(e,e′n)p reaction and the influence of nuclear binding

Author

Herberg, C., Ostrick, M., Andresen, H.G., Annand, J.R.M., Aulenbacher, K., Becker, J., Drescher, P., Eyl, D., Frey, A., Grabmayr, P., Hall, S.J., Hartmann, P., Hehl, T., Heil, W., Hoffmann, J., Ireland, D., Kellie, J.D., Klein, F., Livingston, K., Nachtigall, Ch., Natter, A., Otten, E.W., Owens, R.O., Reichert, E., Rohe, D., Schmieden, H., Sprengard, R., Steigerwald, M., Steffens, K.-H., Walcher, Th., and Watson, R.

Published
1999
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18. First measurement of the polarisation transfer on the proton in the reactions $$D(\vec e,e'\vec p)$$

Author

Eyl, D., Frey, A., Andresen, H. G., Annand, J. R. M., Aulenbacher, K., Becker, J., Blume-Werry, J., Dombo, Th., Drescher, P., Fischer, H., Grabmayr, P., Hall, S. J., Hartmann, P., Hehl, T., Heil, W., Hoffmann, J., Kellie, J. D., Klein, F., Meyerhoff, M., Nachtigall, Ch., Ostrick, M., Otten, E. W., Owens, R. O., Plützer, S., Reichert, E., Rieger, R., Schmieden, H., Sprengard, R., Steffens, K. -H., and Walcher, Th.

Published
1995
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19. STRUCTURE OF THE NUCLEON INVESTIGATED BY COMPTON SCATTERING

Author

GALLER, G., primary, WOLF, S., additional, CAMEN, M., additional, KOSSERT, K., additional, PROFF, S., additional, SCHUMACHER, M., additional, WISSMANN, F., additional, AHRENS, J., additional, ARENDS, H.-J., additional, BECK, R., additional, HÄRTER, F., additional, JENNEWEIN, P., additional, PEISE, J., additional, PREOBRAJENSKI, I., additional, SCHMITZ, M., additional, MASSONE, A.M., additional, MOLINARI, C., additional, OTTONELLO, P., additional, ROBBIANO, A., additional, SANZONE, M., additional, L'VOV, A.I., additional, LISIN, V., additional, KONDRATIEV, R., additional, GRABMAYR, P., additional, and HEHL, T., additional

Published
2001
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21. On photonuclear reaction mechanisms at intermediate energies

Author

Lamparter, Th., Ahrens, J., Annand, J. R. M., Anthony, I., Beck, R., Branford, D., Cross, G. E., Davinson, T., Grabmayr, P., Hall, S. J., Harty, P. D., Hehl, T., Kellie, J. D., MacGregor, I. J. D., MacKenzie, J. A., McGeorge, J. C., Miller, G. J., Owens, R. O., Sauer, M., Schneider, R., Spaeth, K., and Wagner, G. J.

Published
1996
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23. Structure of the nucleon investigated by Compton scattering

Author

Wolf, S., Lisin, V., Kondratiev, R., Massone, A.M., Galler, G., Ahrens, J., Arends, H.-J., Beck, R., Camen, M., Capitani, G.P., Grabmayr, P., Hall, S.J., Härter, F., Hehl, T., Jennewein, P., Kossert, K., L'vov, A.I., Molinari, C., Ottonello, P., Peise, J., Preobrajenskij, I., Proff, S., Robbiano, A., Sanzone, M., Schumacher, M., Schmitz, M., and Wissmann, F.

Published
2001
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24. Compton scattering from the free and bound proton above π-threshold

Author

Wissmann, F., Achenbach, P., Ahrens, J., Arends, H.-J., Beck, R., Bilger, R., Camen, M., Capitani, G.P., Caselotti, G., Galler, G., Grabmayr, P., Härter, F., Hehl, T., Heid, E., Hejny, V., Jahn, O., Jennewein, P., Kondratjev, R., Kossert, K., Kotulla, M., Krusche, B., Kuhr, V., Lang, M., Leukel, R., Levchuk, M.I., Lisin, V., L’vov, A.I., Massone, A.M., Metag, V., Natter, A., Novotny, R., Olmos de León, V., Ottonello, P, Peise, J., Polonski, A., Preobrashenskij, I., Proff, S., Rambo, F., Robbiano, A., Rosenkranz, D., Sanzone, M., Schilling, E., Schmidt, A., Schumacher, M., Seitz, B., Siodlaczek, U., Smend, F., Ströher, H., Vorwerk, H., Walcher, Th., Weiss, J., Wolf, M., Wolf, S., and Zapadtka, F.

Published
2000
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26. Investigation of the Exclusive 3He(e, e’pn) 1H Reaction

Author

Kepler Centre for Astro and Particle Physics, Physikalisches Institut, Universität Tübingen, D-72076 Tübingen, Germany, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, Scotland, Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany, Nikhef, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands, Nikhef, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands, Department of Physics, VU-university, Amsterdam, The Netherlands, Department of Physics, University of Zagreb, Zagreb, Croatia, M. Smoluchowski Institute of Physics, Jagiellonian University, PL-30059 Kraków, Poland, Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum, Germany, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, Institute for Advanced Simulation, Institut für Kernphysik, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany, Institute Jožef Stefan, University of Ljubljana, Ljubljana, Slovenia, Middleton, D. G., Annand, J. R. M., Antelo, M. Ases, Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., Böhm, R., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., García, Llongo J., Glazier, D. I., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., Kamada, H., Jover, Mañas G., Kohl, M., Lapikás, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Pérez-Benito, R., Pospischil, Th., Potokar, M., Rosner, G., Seimetz, M., Skibiński, R., de, Vries H., Walcher, Th., Watts, D. P., Weinriefer, M., Weiss, M., Witała, H., Zihlmann, B., Kepler Centre for Astro and Particle Physics, Physikalisches Institut, Universität Tübingen, D-72076 Tübingen, Germany, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, Scotland, Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany, Nikhef, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands, Nikhef, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands, Department of Physics, VU-university, Amsterdam, The Netherlands, Department of Physics, University of Zagreb, Zagreb, Croatia, M. Smoluchowski Institute of Physics, Jagiellonian University, PL-30059 Kraków, Poland, Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum, Germany, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, Institute for Advanced Simulation, Institut für Kernphysik, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany, Institute Jožef Stefan, University of Ljubljana, Ljubljana, Slovenia, Middleton, D. G., Annand, J. R. M., Antelo, M. Ases, Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., Böhm, R., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., García, Llongo J., Glazier, D. I., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., Kamada, H., Jover, Mañas G., Kohl, M., Lapikás, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Pérez-Benito, R., Pospischil, Th., Potokar, M., Rosner, G., Seimetz, M., Skibiński, R., de, Vries H., Walcher, Th., Watts, D. P., Weinriefer, M., Weiss, M., Witała, H., and Zihlmann, B.

Abstract

type:Journal Article, Cross sections for the 3He(e,e' pn)1H reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming smaller at higher recoil proton momentum.

Published
2017

27. Measurement of the Neutron Electric to Magnetic Form Factor Ratio at Q2=1.58 GeV2 Using the Reaction He−→3(e⃗ ,e′n)pp

Author

Schlimme, B.S., Achenbach, P., Ayerbe Gayoso, C. A., Bernauer, J. C., Böhm, R., Bosnar, D., Challand, T., Distler, M.O., Doria, L., Fellenberger, F., Fonvieille, H., Gómez Rodríguez, M., Grabmayr, P., Hehl, T., Heil, W., Kiselev, D., Krimmer, J., Makek, M., Merkel, H., Middleton, D. G., Müller, U., Nungesser, L., Ott B., A., Pochodzalla, J., Potokar, M., Sánchez Majos, S., Sargsian M., M., Sick, I., Širca, S., Weinriefer, M., Wendel, M., Yoon, J., Institut für Kernphysik, Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), Department of Physics [Zagreb], Faculty of Science [Zagreb], University of Zagreb-University of Zagreb, Department of Physics, University of Basel (Unibas), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Physikalisches Institut [Tübingen], Eberhard Karls Universität Tübingen = Eberhard Karls University of Tuebingen, Institut für Physik [Mainz], The Swiss Light Source (SLS) (SLS-PSI), Paul Scherrer Institute (PSI), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Jozef Stefan Institute [Ljubljana] (IJS), Florida International University [Miami] (FIU), University of Ljubljana, Johannes Gutenberg - Universität Mainz (JGU), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

International audience; A measurement of beam helicity asymmetries in the reaction He−→3(e⃗ ,e′n)pp is performed at the Mainz Microtron in quasielastic kinematics to determine the electric to magnetic form factor ratio of the neutron GnE/GnM at a four-momentum transfer Q2=1.58 GeV2. Longitudinally polarized electrons are scattered on a highly polarized He3 gas target. The scattered electrons are detected with a high-resolution magnetic spectrometer, and the ejected neutrons are detected with a dedicated neutron detector composed of scintillator bars. To reduce systematic errors, data are taken for four different target polarization orientations allowing the determination of GnE/GnM from a double ratio. We find μnGnE/GnM=0.250±0.058(stat)±0.017(syst).

Published
2013

28. Measurement of the Neutron Electric to Magnetic Form Factor Ratio at Q2=1.58 GeV2 Using the Reaction 3He→(e→, e′n)pp

Author

Schlimme, B.S., Achenbach, P., Ayerbe Gayoso, C., Bernauer, J.C., Böhm, R., Bosnar, Damir, Challand, Th., Distler, M.O., Doria, L., Fellenberger, F., Fonvieille, H., Gómez Rodríguez, M., Grabmayr, P., Hehl, T., Heil, W., Kiselev, D., Krimmer, J., Makek, Mihael, Merkel, H., Middleton, D.G., Müller, U., Nungesser, L., Ott, B.A., Pochodzalla, J., Potokar, M., Sánchez Majos, S., Sargsian, M.M., Sick, I., Širca, S., Weinriefer, M., Wendel, M., and Yoon, C.J.

Subjects
PRIRODNE ZNANOSTI. Fizika, elastic electron scattering, electromagnetic form factors, High Energy Physics::Experiment, protons and neutrons, Nuclear Experiment, NATURAL SCIENCES. Physics
Abstract

A measurement of beam helicity asymmetries in the reaction 3He⃗(e⃗, e′n)pp is performed at the Mainz Microtron in quasielastic kinematics to determine the electric to magnetic form factor ratio of the neutron GEn/GMn at a four-momentum transfer Q2=1.58 GeV2. Longitudinally polarized electrons are scattered on a highly polarized 3He gas target. The scattered electrons are detected with a high-resolution magnetic spectrometer, and the ejected neutrons are detected with a dedicated neutron detector composed of scintillator bars. To reduce systematic errors, data are taken for four different target polarization orientations allowing the determination of GEn/GMn from a double ratio. We find μnGEn/GMn=0.250±0.058(stat)±0.017(syst).

Published
2013

29. Investigation of the Exclusive He3(e,e′pn)H1 Reaction

Author

Middleton, D. G., Annand, J. R M, Antelo, M. Ases, Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., Böhm, R., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., Llongo, J. García, Glazier, D. I., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H A, Jans, E., Kamada, H., Mañas, G. Jover, Kohl, M., Lapikás, L., MacGregor, I. J D, Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Pérez-Benito, R., Pospischil, Th, Potokar, M., Rosner, G., Seimetz, M., Skibiński, R., De Vries, H., Walcher, Th, Watts, D. P., Weinriefer, M., Weiss, M., Witała, H., and Zihlmann, B.

Subjects
Nuclear Theory, Physics and Astronomy(all), Nuclear Experiment
Abstract

Cross sections for the He3(e,e′pn)H1 reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming smaller at higher recoil proton momentum.

Published
2009

30. Investigation of the Exclusive He-3(e, e ' pn)H-1 Reaction

Author

Middleton, D. G., Annand, J. R. M., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., Llongo, J. G., Glazier, D. I., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Antelo, M. A., Heim, J., Hesselink, W. H. A., Jans, E., Kamada, H., Manas, G. Jover, Kohl, M., Lapikas, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Ayerbe, C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Perez-Benito, R., Pospischil, Th., Potokar, M., Rosner, G., Barneo, P., Seimetz, M., Skibinski, R., de Vries, H., Walcher, Th., Watts, D. P., Weinriefer, M., Weiss, M., Witala, H., Zihlmann, B., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., and Böhm, R.

Subjects
Nuclear Theory, ddc:550, Physics::Accelerator Physics, Nuclear Experiment
Abstract

Cross sections for the He-3(e, e' pn)H-1 reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming smaller at higher recoil proton momentum.

Published
2009

31. Investigation of the Exclusive ^{; ; ; 3}; ; ; He(e, e'pn)p Reaction

Author

Middleton, D.G., Annand, J.R.M., Ases Antelo, M., Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H.P., Bosnar, Damir, Böhm, R., Ding, M., Distler, M.O., Friedrich, J., García Llongo, J., Glazier, D. G., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W.H.A., Jans, E., Kamada, H., Jover Mañ, As, G., Kohl, M., Lapikás, L., MacGregor, I.J.D., Martin, I., McGeorge, J.C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Pérez Benito, R., Pospischil, Th., Potokar, M., Rosner, G., Seimetz, M., Skibiński, R., de Vries, H., Walcher, Th., Watts, D.P., Weinriefer, M., Weiss, M., Witała, H., and Zihlmann, B.

Subjects
Nuclear Theory, Physics::Accelerator Physics, nuclear reactions, inelastic electron scattering, few-body systems, Forces in hadronic systemf, Nuclear Experiment
Abstract

Cross sections for the ^{; ; ; 3}; ; ; He(e, e'pn)p reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming much smaller at higher recoil momentum.

Published
2009

32. Measurement of the pi+ meson polarizabilities via the gamma p -> gamma pi+ n reaction

Author

Ahrens, J., Alexeev, V. M., Annand, J. R. M., Arends, H. J., Beck, R., Caselotti, G., Cherepnya, S. N., Drechsel, D., Fil'kov, L. V., F\\'ohl, K., Giller, I., Grabmayr, P., Hehl, T., Hornidge, D., Kashevarov, V. L., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., McGeorge, J. C., MacGregor, I. J. D., Metag, V., Moinester, M., Novotny, R., Pfeiffer, M., Rost, M., Schadmand, S., Scherer, S., Thomas, A., Unkmeir, C., and Walcher, Th.

Subjects
tagged beam [photon], Nuclear Theory, 0.537-0.817 GeV, photoproduction [pi+], magnetic [polarizability], effect [nucleon resonance], pole [model], (nucleon pi) [coupling], difference [polarizability], High Energy Physics - Experiment, polarizability [pi+], pseudoscalar [coupling], experimental results [spectrometer], High Energy Physics - Phenomenology, Mainz Linac, exclusive reaction [photon p], angular distribution [pi+], High Energy Physics::Experiment, ddc:530, +n+p+pi%2B%22">photon p --> n p pi+, Nuclear Experiment, electric [polarizability]
Abstract

An experiment on the radiative pi^+ meson photoproduction from the proton (gamma p->gamma pi^+ n) was carried out at the Mainz Microtron MAMI in the kinematic region 537 MeV, Comment: 34 pages, 12 figures, final version to appear in Eur. Phys. J. A; typos have been corrected

Published
2005

33. Measurement of the Neutron Electric to Magnetic Form Factor Ratio atQ2=1.58GeV2Using the ReactionHe→3(e→,e′n)pp

Author

Schlimme, B. S., primary, Achenbach, P., additional, Ayerbe Gayoso, C. A., additional, Bernauer, J. C., additional, Böhm, R., additional, Bosnar, D., additional, Challand, Th., additional, Distler, M. O., additional, Doria, L., additional, Fellenberger, F., additional, Fonvieille, H., additional, Gómez Rodríguez, M., additional, Grabmayr, P., additional, Hehl, T., additional, Heil, W., additional, Kiselev, D., additional, Krimmer, J., additional, Makek, M., additional, Merkel, H., additional, Middleton, D. G., additional, Müller, U., additional, Nungesser, L., additional, Ott, B. A., additional, Pochodzalla, J., additional, Potokar, M., additional, Sánchez Majos, S., additional, Sargsian, M. M., additional, Sick, I., additional, Širca, S., additional, Weinriefer, M., additional, Wendel, M., additional, and Yoon, C. J., additional

Published
2013
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34. Photoabsorption and correlated nucleon pairs

Author

Grabmayr, P., Hehl, T., Lamparter, T., Leypoldt, J., Mondry, A., Sauer, M., Schneider, R., Spaeth, K., Wagner, G.J., Annand, J.R.M., Harty, P.D., MacGregor, D., McGeorge, J.C., Owens, R.O., Branford, D., MacKenzie, J., and Liang, M.

Subjects
QC
Published
1993

35. Knockout of proton-neutron pairs from 16O with electromagnetic probes

Author

Middleton, D. G., primary, Annand, J. R. M., additional, Barbieri, C., additional, Giusti, C., additional, Grabmayr, P., additional, Hehl, T., additional, MacGregor, I. J. D., additional, Martin, I., additional, McGeorge, J. C., additional, Moschini, F., additional, Pacati, F. D., additional, Schwamb, M., additional, and Watts, D., additional

Published
2009
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36. Investigation of the ExclusiveHe3(e,e′pn)H1Reaction

Author

Middleton, D. G., primary, Annand, J. R. M., additional, Antelo, M. Ases, additional, Ayerbe, C., additional, Barneo, P., additional, Baumann, D., additional, Bermuth, J., additional, Bernauer, J., additional, Blok, H. P., additional, Böhm, R., additional, Bosnar, D., additional, Ding, M., additional, Distler, M. O., additional, Friedrich, J., additional, Llongo, J. García, additional, Glazier, D. I., additional, Golak, J., additional, Glöckle, W., additional, Grabmayr, P., additional, Hehl, T., additional, Heim, J., additional, Hesselink, W. H. A., additional, Jans, E., additional, Kamada, H., additional, Mañas, G. Jover, additional, Kohl, M., additional, Lapikás, L., additional, MacGregor, I. J. D., additional, Martin, I., additional, McGeorge, J. C., additional, Merkel, H., additional, Merle, P., additional, Monstad, K., additional, Moschini, F., additional, Müller, U., additional, Nogga, A., additional, Pérez-Benito, R., additional, Pospischil, Th., additional, Potokar, M., additional, Rosner, G., additional, Seimetz, M., additional, Skibiński, R., additional, de Vries, H., additional, Walcher, Th., additional, Watts, D. P., additional, Weinriefer, M., additional, Weiss, M., additional, Witała, H., additional, and Zihlmann, B., additional

Published
2009
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37. Experimental study of the halo nucleusHe6using theLi6(γ,π+)He6reaction

Author

Harrington, N. P., primary, Branford, D., additional, Föhl, K., additional, Roche, E., additional, Annand, J. R. M., additional, Beck, R., additional, Grabmayr, P., additional, Hehl, T., additional, Hornidge, D., additional, Livingston, K., additional, McGreorge, J. C., additional, MacGregor, I. J. D., additional, Martin, I., additional, Monstad, K., additional, Moschini, F., additional, Reiter, A., additional, Waddell, S., additional, Watts, D. P., additional, and Young, S., additional

Published
2007
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38. Measurement of the πmeson polarizabilities via the γp → γπ+n reaction

Author

Ahrens, J., primary, Alexeev, V. M., additional, Annand, J. R. M., additional, Arends, H. J., additional, Beck, R., additional, Caselotti, G., additional, Cherepnya, S. N., additional, Drechsel, D., additional, Fil’kov, L. V., additional, Föhl, K., additional, Giller, I., additional, Grabmayr, P., additional, Hehl, T., additional, Hornidge, D., additional, Kashevarov, V. L., additional, Kotulla, M., additional, Krambrich, D., additional, Krusche, B., additional, Lang, M., additional, McGeorge, J. C., additional, MacGregor, I. J. D., additional, Metag, V., additional, Moinester, M., additional, Novotny, R., additional, Pfeiffer, M., additional, Rost, M., additional, Schadmand, S., additional, Scherer, S., additional, Thomas, A., additional, Unkmeir, C., additional, and Walcher, Th., additional

Published
2004
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39. Three-nucleon mechanisms in photoreactions

Author

Watts, D.P., primary, Ahrens, J., additional, Annand, J.R.M., additional, Beck, R., additional, Branford, D., additional, Grabmayr, P., additional, Hehl, T., additional, Kellie, J.D., additional, MacGregor, I.J.D., additional, McGeorge, J.C., additional, and Owens, R.O., additional

Published
2003
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40. Investigation ofΔ-medium effects using the4He(γ,π+n)3Hand4He(γ,π+p)nnnreactions

Author

Branford, D., primary, Arneil, J. F., additional, MacKenzie, J. A., additional, Föhl, K., additional, Ahrens, J., additional, Annand, J. R. M., additional, Beck, R., additional, Franczuk, S., additional, Grabmayr, P., additional, Hall, S. J., additional, Harty, P. D., additional, Hehl, T., additional, Kellie, J. D., additional, Liang, M., additional, MacGregor, I. J. D., additional, McGeorge, J. C., additional, Natter, A., additional, Oberkirsch, S., additional, Owens, R. O., additional, Powrie, C. J. Y., additional, Watts, D. P., additional, and Wunderlich, S., additional

Published
2002
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41. Compton scattering by the proton using a large-acceptance arrangement

Author

Wolf, S., primary, Lisin, V., additional, Kondratiev, R., additional, Massone, A.M., additional, Galler, G., additional, Ahrens, J., additional, Arends, H.-J., additional, Beck, R., additional, Camen, M., additional, Capitani, G.P., additional, Grabmayr, P., additional, Härter, F., additional, Hehl, T., additional, Jennewein, P., additional, Kossert, K., additional, L'vov, A.I., additional, Molinari, C., additional, Ottonello, P., additional, Owens, R.O., additional, Peise, J., additional, Preobrajenskij, I., additional, Proff, S., additional, Robbiano, A., additional, Sanzone, M., additional, Schumacher, M., additional, Schmitz, M., additional, and Wissmann, F., additional

Published
2001
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42. Polarized photon measurements of the12C(γ→,pp)and12C(γ→,pn)reactions forEγ=160−350MeV

Author

Powrie, C. J. Y., primary, McGeorge, J. C., additional, MacGregor, I. J. D., additional, Ahrens, J., additional, Annand, J. R. M., additional, Arneil, J. F., additional, Beck, R., additional, Branford, D., additional, Franczuk, S., additional, Glazier, D. I., additional, Grabmayr, P., additional, Hall, S. J., additional, Hehl, T., additional, Harty, P. D., additional, Ireland, D. G., additional, Kellie, J. D., additional, Livingston, K., additional, Natter, F. A., additional, Oberkirsch, S., additional, Owens, R. O., additional, Ryckebusch, J., additional, Sauer, M., additional, Settele, A., additional, and Watts, D. P., additional

Published
2001
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43. Compton scattering by the proton

Author

Galler, G., primary, Lisin, V., additional, Kondratiev, R., additional, Massone, A.M., additional, Wolf, S., additional, Ahrens, J., additional, Arends, H.-J., additional, Beck, R., additional, Camen, M., additional, Capitani, G.P., additional, Grabmayr, P., additional, Hall, S.J., additional, Härter, F., additional, Hehl, T., additional, Jennewein, P., additional, Kossert, K., additional, L'vov, A.I., additional, Molinari, C., additional, Ottonello, P., additional, Peise, J., additional, Preobrajenski, I., additional, Proff, S., additional, Robbiano, A., additional, Sanzone, M., additional, Schumacher, M., additional, Schmitz, M., additional, and Wissmann, F., additional

Published
2001
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44. The12C(γ,NN)reaction studied over a wide kinematic range

Author

Watts, D. P., primary, MacGregor, I. J. D., additional, Ahrens, J., additional, Annand, J. R. M., additional, Beck, R., additional, Branford, D., additional, Grabmayr, P., additional, Hall, S. J., additional, Harty, P. D., additional, Hehl, T., additional, Kellie, J. D., additional, Lamparter, T., additional, Liang, M., additional, MacKenzie, J. A., additional, McAllister, S. J., additional, McGeorge, J. C., additional, Owens, R. O., additional, Sauer, M., additional, Schneider, R., additional, Wagner, G. J., additional, and Yau, T. T-H., additional

Published
2000
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45. Nuclear pion photoproduction in theΔresonance region

Author

Branford, D., primary, MacKenzie, J. A., additional, Lee, F. X., additional, Ahrens, J., additional, Annand, J. R. M., additional, Beck, R., additional, Cross, G. E., additional, Davinson, T., additional, Grabmayr, P., additional, Hall, S. J., additional, Harty, P. D., additional, Hehl, T., additional, Johnstone, D. G., additional, Kellie, J. D., additional, Lamparter, T., additional, Liang, M., additional, MacGregor, I. J. D., additional, McGeorge, J. C., additional, Owens, R. O., additional, Sauer, M., additional, Schneider, R., additional, Shotter, A. C., additional, Spaeth, K., additional, Watts, D. P., additional, Woods, P. J., additional, Wright, L. E., additional, and Yau, T. T., additional

Published
1999
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46. The(γ,pd)reaction in12C

Author

McAllister, S. J., primary, McGeorge, J. C., additional, MacGregor, I. J. D., additional, Annand, J. R. M., additional, Hall, S. J., additional, Harty, P. D., additional, Kellie, J. D., additional, Miller, G. J., additional, Owens, R. O., additional, Watts, D. P., additional, Yau, T. T-H., additional, Branford, D., additional, MacKenzie, J. A., additional, Liang, M., additional, Grabmayr, P., additional, Hehl, T., additional, Lamparter, T., additional, Sauer, M., additional, Schneider, R., additional, Ahrens, J., additional, and Beck, R., additional

Published
1999
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47. C(,pn) photon asymmetry for Eγ=180–340 MeV

Author

Franczuk, S., primary, MacGregor, I.J.D., additional, Ahrens, J., additional, Annand, J.R.M., additional, Arneil, J.F., additional, Beck, R., additional, Branford, D., additional, Grabmayr, P., additional, Hall, S.J., additional, Hehl, T., additional, Harty, P.D., additional, Ireland, D.G., additional, Kellie, J.D., additional, Livingston, K., additional, McGeorge, J.C., additional, Natter, F.A., additional, Oberkirsch, S., additional, Owens, R.O., additional, Powrie, C.J.Y., additional, Ryckebusch, J., additional, Sauer, M., additional, Settele, A., additional, and Watts, D.P., additional

Published
1999
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49. Mechanisms in theC12(γ,pn)and(γ,pp)Reactions

Author

MacGregor, I. J. D., primary, Yau, T. T-H., additional, Ahrens, J., additional, Annand, J. R. M., additional, Beck, R., additional, Branford, D., additional, Grabmayr, P., additional, Hall, S. J., additional, Harty, P. D., additional, Hehl, T., additional, Kellie, J. D., additional, Lamparter, T., additional, Liang, M., additional, MacKenzie, J. A., additional, McAllister, S., additional, McGeorge, J. C., additional, Owens, R. O., additional, Ryckebusch, J., additional, Sauer, M., additional, Schneider, R., additional, and Watts, D. P., additional

Published
1998
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