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1. The horizontal drift chambers for the focal plane proton-polarimeter of the 3-spectrometer setup at MAMI

Author

A. Kozlov, Glen A. Warren, P. Bartsch, J. Sanner, D. Baumann, M. Ding, Ronald Ransome, G. Rosner, K. W. Krygier, Michael Seimetz, Ingo Sick, S. Grözinger, Klemen Bohinc, M. Kahrau, Achim Richter, M. Weis, D. Elsner, O. Strähle, R. Geiges, Justin I. McIntyre, R. Neuhausen, F. Klein, N. Clawiter, U. Müller, I. Ewald, X. Q. Wu, P. König, S. Derber, Th. Walcher, A. Wagner, J.M. Friedrich, M. Hamdorf, P. Jennewein, R. Böhm, S. Hedicke, Th. Pospischil, S. Malov, A. Süle, P. Merle, M. Potokar, E. A. J. M. Offermann, A. Liesenfeld, H. Schmieden, Harald Merkel, J. Jourdan, H. Kramer, J. Lac, and M. O. Distler

Subjects
Physics, Nuclear and High Energy Physics, Argon, Proton, Spectrometer, Physics::Instrumentation and Detectors, business.industry, chemistry.chemical_element, Polarimeter, Cardinal point, Optics, chemistry, business, Instrumentation, Image resolution
Abstract

Large-area horizontal drift chambers have been built for use in a proton polarimeter. A gas mixture of 20% argon and 80% ethane is used. The left–right assignment is achieved by measuring the difference of the signals induced on neighboring potential wires. A spatial resolution of 300 μm is achieved.

Published
2002
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2. GEp/GMpRatio by Polarization Transfer ine→p→ep→

Author

M. K. Jones, K. A. Aniol, F. T. Baker, J. Berthot, P. Y. Bertin, W. Bertozzi, A. Besson, L. Bimbot, W. U. Boeglin, E. J. Brash, D. Brown, J. R. Calarco, L. S. Cardman, C.-C. Chang, J.-P. Chen, E. Chudakov, S. Churchwell, E. Cisbani, D. S. Dale, R. De Leo, A. Deur, B. Diederich, J. J. Domingo, M. B. Epstein, L. A. Ewell, K. G. Fissum, A. Fleck, H. Fonvieille, S. Frullani, J. Gao, F. Garibaldi, A. Gasparian, G. Gerstner, S. Gilad, R. Gilman, A. Glamazdin, C. Glashausser, J. Gomez, V. Gorbenko, A. Green, J.-O. Hansen, C. R. Howell, G. M. Huber, M. Iodice, C. W. de Jager, S. Jaminion, X. Jiang, W. Kahl, J. J. Kelly, M. Khayat, L. H. Kramer, G. Kumbartzki, M. Kuss, E. Lakuriki, G. Lavessière, J. J. LeRose, M. Liang, R. A. Lindgren, N. Liyanage, G. J. Lolos, R. Macri, R. Madey, S. Malov, D. J. Margaziotis, P. Markowitz, K. McCormick, J. I. McIntyre, R. L. J. van der Meer, R. Michaels, B. D. Milbrath, J. Y. Mougey, S. K. Nanda, E. A. J. M. Offermann, Z. Papandreou, C. F. Perdrisat, G. G. Petratos, N. M. Piskunov, R. I. Pomatsalyuk, D. L. Prout, V. Punjabi, G. Quéméner, R. D. Ransome, B. A. Raue, Y. Roblin, R. Roche, G. Rutledge, P. M. Rutt, A. Saha, T. Saito, A. J. Sarty, T. P. Smith, P. Sorokin, S. Strauch, R. Suleiman, K. Takahashi, J. A. Templon, L. Todor, P. E. Ulmer, G. M. Urciuoli, P. Vernin, B. Vlahovic, H. Voskanyan, K. Wijesooriya, B. B. Wojtsekhowski, R. J. Woo, F. Xiong, G. D. Zainea, and Z.-L. Zhou

Subjects
Elastic scattering, Physics, Proton, 010308 nuclear & particles physics, Proton magnetic moment, General Physics and Astronomy, Electron, Polarization (waves), 01 natural sciences, Charged particle, Nuclear physics, Magnetization, 0103 physical sciences, Magnetic form factor, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The ratio of the proton's elastic electromagnetic form factors was obtained by measuring the transverse and longitudinal polarizations of recoiling protons from the elastic scattering of polarized electrons with unpolarized protons. The ratio of the electric to magnetic form factor is proportional to the ratio of the transverse to longitudinal recoil polarizations. The ratio was measured over a range of four-momentum transfer squared between 0.5 and 3.5 GeV-squared. Simultaneous measurement of transverse and longitudinal polarizations in a polarimeter provides good control of the systematic uncertainty. The results for the ratio of the proton's electric to magnetic form factors show a systematic decrease with increasing four momentum squared, indicating for the first time a marked difference in the spatial distribution of charge and magnetization currents in the proton.

Published
2000
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3. High-Precision Studies of theH3e(e,e′p)Reaction at the Quasielastic Peak

Author

M. Kahrau, J. P. Chen, Jing Zhao, Th. Walcher, J. A. Templon, J.M. Friedrich, R. Geiges, G. Rosner, Achim Richter, D. J. Margaziotis, R. E. J. Florizone, P. Bartsch, William Bertozzi, U. Müller, R. Böhm, Klemen Bohinc, K. Merle, Konrad Aniol, E. A. J. M. Offermann, I. Ewald, K. W. Krygier, A. Wagner, W.U. Boeglin, M. O. Distler, M. B. Epstein, Simon Širca, Z. L. Zhou, D. S. Dale, R. Neuhausen, Th. Pospischil, S.P. Van Verst, G. Schrieder, P. Jennewein, A. J. Sarty, Shalev Gilad, M. Kuss, M. Potokar, H. Schmieden, A. Liesenfeld, and Harald Merkel

Subjects
Baryon, Nuclear reaction, Physics, Nuclear physics, Momentum, Nuclear Theory, Hadron, Momentum transfer, General Physics and Astronomy, Elementary particle, Nuclear Experiment, Nucleon, Microtron
Abstract

Precision studies of the reaction [sup 3]He( e,thinspe[sup [prime]]p) using the three-spectrometer facility at the Mainz microtron MAMI are presented. All data are for quasielastic kinematics at [vert bar][rvec q][vert bar]=685 MeV/c . Absolute cross sections were measured at three electron kinematics. For the measured missing momenta range from 10 to 165 MeV/c , no strength is observed for missing energies higher than 20thinspthinspMeV. Distorted momentum distributions were extracted for the two-body breakup and the continuum. The longitudinal and transverse nature of the cross sections is well described by a widely used prescription of the off-shell electron-nucleon cross section. The results are compared to modern three-body calculations and to previous data. [copyright] [ital 1999] [ital The American Physical Society]

Published
1999
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4. Virtual compton scattering under π0 threshold at Q2=0.33 GeV2. Preliminary results

Author

P. Bartsch, J.E. Ducret, I. Ewald, Ch. Hyde-Wright, P. Vernin, G. Quemener, R. Geiges, R. Van de Vyver, G. Tamas, Marc Vanderhaeghen, A. Wagner, P. Merle, N. d'Hose, O. Ravel, R. Edelhoff, P.Y. Bertin, J. Van de Wiele, M. Kahrau, Vincent Breton, J.M. Friedrich, J. Martino, J. Roche, H. Kramer, Th. Gousset, E. A. J. M. Offermann, W.U. Boeglin, D. Lhuillier, G. Rosner, T. Caprano, A. Liesenfeld, P.A.M. Guichon, P. Sauer, S. Derber, N. Degrande, M. O. Distler, R. Böhm, K. Merle, H. Holvoet, P. Jennewein, V. Kunde, Y. Roblin, J. Berthot, G. De Meyer, C. Marchand, S. Kerhoas, D. Marchand, J. Y. Mougey, B. Lannoy, Th. Pospischil, H. Schmieden, Michael Tytgat, Harald Merkel, H. Fonvieille, Th. Walcher, L. Van Hoorebeke, S. Schardt, Dirk Ryckbosch, K. W. Krygier, R. Neuhausen, S. Wolf, and M. Korn

Subjects
Physics, Massless particle, Nuclear reaction, Elastic scattering, Nuclear physics, Nuclear and High Energy Physics, Photon, Scattering, Momentum transfer, Compton scattering, Virtual particle, Atomic physics, Nuclear Experiment
Abstract

We have measured the absolute unpolarized cross sections for photon electro-production off the proton ep → epγ with the Three-Spectrometer-Setup at MAMI at a momentum transfer q=600 MeV/c and a virtual photon polarization ɛ=0.62. The momentum q ′ of the outgoing real photon range from 33 to 111 MeV/c. We extracted two combinations of the recently introduced generalized polarizabilities [1,2].

Published
1999
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5. Precise measurements of the neutron magnetic form factor

Author

T. Petitjean, S. Schardt, Ingo Sick, J.M. Friedrich, L. J. deBever, M. Potokar, A. Wagner, Achim Richter, J. Zhao, P. Jennewein, M. O. Distler, H. Anklin, G. Masson, P. Trueb, R. Böhm, Th. Walcher, K.W. Krygier, W.U. Boeglin, J. Jourdan, H. Kramer, P. Sauer, M. Zeier, A. Rokavec, K. Merle, L.M. Qin, M. Tuccillo, R. Geiges, M. Kahrau, S. Sirca, A. Honegger, J. Götz, G. Kubon, R. Edelhoff, Glen A. Warren, K. I. Blomqvist, G. Rosner, Th. Pospischil, E. A. J. M. Offermann, A. Liesenfeld, V. Kunde, B. Zihlmann, B. Vodenik, D. Fritschi, R. Neuhausen, S. Wolf, and M. Korn

Subjects
Elastic scattering, Physics, Nuclear physics, Nuclear and High Energy Physics, Range (particle radiation), Astrophysics::High Energy Astrophysical Phenomena, Magnetic form factor, Neutron detection, Neutron, Atomic physics, Neutron radiation, Nuclear Experiment, Intensity (heat transfer)
Abstract

The neutron magnetic form factor Gmn has been determined via a measurement of the ratio of cross sections D(e,e′n) and D(e,e′p). The absolute detection efficiency of the neutron detector was measured with high accuracy using tagged neutrons produced from H(n,p)n elastic scattering by means of a high intensity neutron beam. This approach minimizes the model dependence and improves upon the weakest points of previous experiments. Data in the range q2=0.2–0.8 (GeV/c)2 with uncertainties of

Published
1998
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6. Dispersive effects from a comparison of electron and positron scattering from12C

Author

C. Marchand, J. Marroncle, Paul Gueye, A. Magnon, Vincent Breton, J. F. Danel, Salvatore Frullani, A. Zghiche-Lakéhal-Ayat, P. Vernin, J.-M. Le Goff, M. Jodice, M. Bernheim, J.E. Ducret, Marco Traini, F. Garibaldi, J. Morgenstern, E. A. J. M. Offermann, F. Ghio, Z. E. Meziani, L. Lakehal-Ayat, and D.B. Isabelle

Subjects
Elastic scattering, Diffraction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, Particle accelerator, Electron, 01 natural sciences, Linear particle accelerator, law.invention, Cross section (physics), Positron, law, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract

Dispersive effects have been investigated by comparing elastic scattering of electrons and positrons from {sup 12}C at the Saclay Linear Accelerator. The results demonstrate that dispersive effects at energies of 262 MeV and 450 MeV are less than 2% below the first diffraction minimum [0.95 < q{sub eff} (fm{sup -1}) < 1.66] in agreement with the prediction of Friar and Rosen. At the position of this minimum (q{sub eff} = 1.84 fm{sup -1}), the deviation between the positron scattering cross section and the cross section derived from the electron results is -44% {+-} 30%.

Published
1998
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7. Investigation of short-range nucleon-nucleon correlations using the reaction in close to 4π geometry

Author

R. Geiges, E. A. J. M. Offermann, A. Liesenfeld, Th. Pospischil, K. I. Blomqvist, M. O. Distler, V. Kunde, B. Vodenik, M. Kahrau, G. Rosner, A. Wagner, R. Edelhoff, Achim Richter, J.M. Friedrich, Manoj Kumar Yadav, M. Korn, Christopher Morris, M. Potokar, K. Merle, R. Neuhausen, S. Wolf, A. Rokavec, K.W. Krygier, P. Sauer, M. K. Jones, R. Böhm, H. Kramer, W.U. Boeglin, M. Kuss, Jan Ryckebusch, Ronald Ransome, S. Schardt, Barry Ritchie, and Th. Walcher

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Missing energy, Spectrometer, Nuclear Theory, Geometry, Electron, Coincidence, Nuclear physics, Momentum, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, Nucleon, Crystal Ball
Abstract

Two-proton correlations were studied in close to 4 π geometry using the reaction 12 C (e,e′pp) . The beam energy was 705 MeV, the energy transfer 225 MeV, and the three-momentum transfer 412 MeV/c. The electrons were observed in a large-acceptance magnetic spectrometer in coincidence with protons observed in a BGO crystal ball. Missing energy and momentum, relative momentum and angular distributions were derived and compared with a factorized two-nucleon emission model. Soft-core correlation functions are favoured by the data.

Published
1998
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8. The three-spectrometer facility at the Mainz microtron MAMI

Author

V. Kunde, M. Kahrau, Achim Richter, H. Kramer, R. Neuhausen, M. O. Distler, S. Wolf, A. Wagner, K. I. Blomqvist, K.W. Krygier, H. Schmieden, J.M. Friedrich, P. Sauer, U. Müller, P. Jennewein, W.U. Boeglin, R. Geiges, G. Rosner, Harald Merkel, K. Merle, R. Böhm, Th. Pospischil, Th. Walcher, M. Korn, E. A. J. M. Offermann, A. Liesenfeld, S. Schardt, and R. Edelhoff

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Cherenkov detector, Solid angle, Electron, law.invention, Nuclear physics, Dipole, Dipole magnet, law, Quadrupole, Nuclear Experiment, Instrumentation, Microtron
Abstract

A set-up of three high-resolution magnetic spectrometers, for simplicity named A, B and C, has been built as the central facility for the precise determination of double and triple coincidence cross sections of hadron knock-out and meson production through the scattering of electrons at the Mainz microtron MAMI. The spectrometers A and C with point-to-point optics in the dispersive plane and parallel-to-point optics in the non-dispersive plane have a solid angle of 28 msr and a momentum acceptance of 20 and 25%, respectively. They each consist of a quadrupole, a sextupole and two dipole magnets, reaching maximum momenta of 735 and 550 MeV/c, respectively. The spectrometer B has a solid angle of 5.6 msr and a somewhat reduced momentum acceptance of 15%, but it reaches a maximum momentum larger than that of the MAMI electron beam (855 MeV/c). It consists of a single-clamshell dipole magnet with point-to-point optics in both planes. Each spectrometer is equipped with a position-sensitive detector system consisting of four planes of vertical drift chambers, two planes of plastic scintillators and a threshold gas Cherenkov detector. The operational experiences demonstrate that all three spectrometers exceed the specifications. Selected results of double (e, e′ x ) and triple (e, e′ x 1 x 2 ) coincidence experiments, x 1 and x 2 standing for charged hadrons, are presented, which demonstrate the performance of the whole set-up.

Published
1998
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9. Pion electroproduction in the 3He(e,é π+)3H reaction at intermediate energies

Author

Achim Richter, B. Vodenik, J.M. Friedrich, K. W. Krygier, S. Schardt, A.W. Richter, P. Sauer, E. A. J. M. Offermann, K. Merle, A. Liesenfeld, Th. Walcher, M. Korn, V. Kunde, M. Kuss, Chary Rangacharyulu, R. Neuhausen, M. Potokar, S. Wolf, J.M. Laget, R. Böhm, A. Rokavec, H. Kramer, S.S. Kamalov, M. Kohl, Toshio Suda, Mariana Kirchbach, R. Geiges, M. O. Distler, G. Schrieder, A. Wagner, M. Kahrau, W.U. Boeglin, R. Edelhoff, K. I. Blomqvist, G. Rosner, L. Tiator, and Th. Pospischil

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Particle accelerator, Resonance (particle physics), law.invention, Nuclear physics, Cross section (physics), Amplitude, Pion, Coincident, law, High Energy Physics::Experiment, Nuclear Experiment, Wave function, Microtron
Abstract

The differential coincident pion electroproduction cross section in the 3 He(e,e π + ) 3 H reaction has been measured with high resolution with the three-spectrometer set-up at the Mainz Microtron (MAMI) electron accelerator. Measurements were performed at the four incident energies E 0 = 855, 675, 600, and 555 MeV at fixed four-momentum transfer Q 2 = 0.045 GeV 2 , with the pions detected in parallel kinematics. This enables a separation of the measured cross section into the transverse and longitudinal structure functions by means of the Rosenbluth method. The experimental data are compared to model calculations, in which the elementary pion production amplitude includes the standard Born-amplitudes and also delta and higher resonance terms. Three-body Fadeev wave functions are used and the final state interaction of the outgoing pion is taken into account. The calculation describes the data only after medium modifications of the delta and of the pion are included.

Published
1997
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10. Precise pion electroproduction in thep(e, e? ?+)n reaction at W=1125 MeV

Author

V. Kunde, R. Edelhoff, M. O. Distler, K. I. Blomqvist, M. Kahrau, W.U. Boeglin, G. Rosner, Simon Širca, B. Vodenik, Achim Richter, R. Geiges, K. W. Krygier, J.M. Friedrich, S. Schardt, K. Merle, M. Korn, L. Tiator, P. Sauer, E. A. J. M. Offermann, O. Hanstein, A. Liesenfeld, A. Wagner, Th. Pospischil, Dieter Drechsel, R. Neuhausen, S. Wolf, M. Potokar, A. Rokavec, R. Böhm, Th. Walcher, H. Schmieden, H. Kramer, and M. Kuss

Subjects
Physics, Nuclear and High Energy Physics, media_common.quotation_subject, Momentum transfer, Structure function, Virtual particle, Polarization (waves), Asymmetry, Nuclear physics, Transverse plane, Pion, Nuclear fusion, Nuclear Experiment, media_common
Abstract

The reactione+p →> e+π ++n at c.m. energyW=1125MeV and momentum transfer Q2=0.117GeV2/c2 has been measured. The transverse and longitudinal structure functions have been separated by varying the polarization of the virtual photon (Rosenbluth plot) with a 3 to 4% error. In addition the longitudinal-transverse interference term has been determined measuring the right-left asymmetry with an accuracy of 3%. The experimental data are compared to model calculations, and the sensitivity of the results to the axial and pion formfactors is discussed.

Published
1996
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11. Forward-AngleH3e(e,e′π±)Coincident Electroproduction and the Search forΔ's in the Ground State ofH3e

Author

Toshio Suda, V. Kunde, Achim Richter, R. Geiges, J.M. Friedrich, Branko Vodenik, E. A. J. M. Offermann, M. Potokar, S. Wolf, A. Rokavec, Chary Rangacharyulu, Th. Pospischil, G. Schrieder, K. Merle, P. Sauer, A. Liesenfeld, A.W. Richter, S. Schardt, M. Kahrau, Th. Walcher, J.M. Laget, R. Edelhoff, K. I. Blomqvist, R. Neuhausen, M. Kuss, Herman J. M. Kramer, A. Wagner, M. Korn, M. Distler, W.U. Boeglin, G. Rosner, K. W. Krygier, and R. Böhm

Subjects
Nuclear reaction, Physics, Particle physics, Pion, Meson, Hadron, General Physics and Astronomy, Elementary particle, Ground state, Omega, Delta baryon
Abstract

Forward-angle coincident electroproduction cross sections of charged pions from ${}^{3}\mathrm{He}$ have been measured at electron energies ${E}_{0}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}855$, 675, 600, and 555 MeV. The overall features of the data for energy transfers of $\ensuremath{\omega}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}370$ to 430 MeV with pions detected along the momentum transfer axis are reproduced in terms of a microscopic model, including pole terms, final state rescattering and produced and preformed $\ensuremath{\Delta}$ resonances. Separation of the cross section into its longitudinal and transverse parts was performed at ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.045\phantom{\rule{0ex}{0ex}}(\mathrm{GeV}/c{)}^{2}$. The longitudinal part of the cross section in the ${\ensuremath{\pi}}^{+}$ channel does not contradict with the assumption of a preformed ${\ensuremath{\Delta}}^{++}$.

Published
1996
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12. High-momentum components in the 1p orbitals of 16O

Author

Th. Walcher, B. Vodenik, R. Edelhoff, K. I. Blomqvist, M. Potokar, Achim Richter, G. Rosner, A. Rokavec, A. Wagner, M. Kahrau, K. Merle, P. Sauer, W.U. Boeglin, Th. Pospischil, R. Geiges, R. Böhm, A. Serdarevic, M. Korn, R. Neuhausen, S. Wolf, J. Lac, S. Schardt, M. O. Distler, K. W. Krygier, J.M. Friedrich, Th. Veit, H. Kramer, M. Kuss, E. A. J. M. Offermann, A. Liesenfeld, and V. Kunde

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Range (particle radiation), Proton, Distribution (number theory), Particle accelerator, High momentum, law.invention, Momentum, Nuclear physics, Atomic orbital, law, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment
Abstract

We have investigated that part of the proton momentum distribution of 16O that is linked through the (e, e′p) reaction to low-lying discrete states in 15N. The MAMI facility with its new generation of 100%-duty-cycle electron accelerator has allowed to cover in this experiment the previously not accessible momentum range of 265

Published
1995
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13. Optimization of complex experiments with respect to a maximum gain of information

Author

E. A. J. M. Offermann, Th. Veit, and J.M. Friedrich

Subjects
Mathematical optimization, Optimization problem, Hardware and Architecture, Maximum gain, Structure function, General Physics and Astronomy, Algorithm, Coincidence, Intuition, Mathematics, Variance function
Abstract

When performing an experiment, one wants to choose the experimental parameters in such a way, that the gain of information in a given time is maximized. In complex experiments, it is hard to achieve this objective and one is tempted to leave the solution of this optimization problem to the intuition of the experimentalist. We have developed a computerized method, which finds the optimal parameters of the experimental setting by minimizing an appropriately chosen variance function. The method is developed for (e, e′p) coincidence experiments, which aim at separating the measured cross sections into the nuclear structure functions. Starting with an experimental program proposed according to experimentalist's intuition, the method leads to modified experimental settings, which, in the same time, lead to a gain of information by a factor of 4.25 compared to the originally proposed ones of Offermann et al. (A1 proposal 6–90). The method is generally applicable to experimental like situations.

Published
1994
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14. Model-independent separation of structure functions over an extended kinematical region

Author

Th. Veit, J.M. Friedrich, W.U. Boeglin, M. O. Distler, R. Edelhoff, K. I. Blomqvist, K. Merle, V. Kunde, S. Schardt, A. Wagner, E. A. J. M. Offermann, A. Liesenfeld, G. Rosner, R. Neuhausen, S. Wolf, Th. Pospischil, M. Korn, R. Geiges, H. Kramer, Achim Richter, K.W. Krygier, P. Sauer, and Th. Walcher

Subjects
Physics, Nuclear and High Energy Physics, Mathematical analysis, Hadron, Elementary particle, Minification, Extension (predicate logic), Fermion, Nucleon, Free parameter, Ansatz
Abstract

A method for the separation of structure functions in (e, e′ p) experiments is proposed, which is an extension of the traditional Rosenbluth-type techniques of [1,2]. In our approach, we use a very flexible Ansatz to describe the structure functions within an extended kinematical regionG and determine its free parameters with a x2 minimization. The procedure is tested by pseudo data (12C(e, e′p)11Bg.s.) in the quasi-free region.

Published
1994
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15. Backtracing particle rays through magnetic spectrometers: avoiding systematic errors in the reconstruction of target coordinates

Author

J.M. Friedrich, Th. Veit, and E. A. J. M. Offermann

Subjects
Physics, Systematic error, Nuclear and High Energy Physics, Matrix (mathematics), Optics, Spectrometer, business.industry, Detector, Particle, business, Instrumentation, Computational physics
Abstract

The procedures used to model [J. Friedrich, Nucl. Instr. and Meth. A 293 (1990) 575] or to determine [N. Voegler et al., Nucl. Instr. and Meth. A 249 (1986) 337, H. Blok et al., ibid., vol. A 262 (1987) 291, and E.A.J.M. Offermann et al., ibid., vol. A 262 (1987) 298] the mapping properties of a magnetic spectrometer are based on a minimization of the variance of target coordinates . We show that backtracing with matrix elements, determined in this way, may contain systematic errors. As alternative, we propose to minimize the variance of the detector coordinates . This procedure avoids these systematic errors.

Published
1993
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16. fLTresponse function of2H(e,e'p)natQ2=0.33 (GeV/c)2

Author

Branko Vodenik, Simon Širca, R. Geiges, Th. Walcher, A. Rokavec, G. Rosner, Achim Richter, K. Merle, R. Böhm, K. I. Blomqvist, S. Wolf, E. A. J. M. Offermann, P. Sauer, I. Ewald, R. Neuhausen, M. Kahrau, V. Kunde, Ingo Sick, R. Edelhoff, W.U. Boeglin, K. W. Krygier, A. Wagner, M. O. Distler, J. Jourdan, A. Serdarevic, Th. Pospischil, M. Korn, M. Kuss, R. E. J. Florizone, S. Schardt, J.M. Friedrich, Hartmuth Arenhövel, Herman J. M. Kramer, M. Potokar, and A. Liesenfeld

Subjects
Baryon, Nuclear reaction, Physics, Nuclear and High Energy Physics, Hadron, Analytical chemistry, Elementary particle, Function (mathematics), Fermion, Nucleon
Abstract

The interference response function f{sub LT}(R{sub LT}) of the {sup 2}H(e,e{sup '}p)n reaction has been determined at squared four-momentum transfer Q{sup 2}=0.33 (GeV/c){sup 2} and for missing momenta up to p{sub m}=0.29 GeV/c. The results have been compared to calculations that reproduce f{sub LT} quite well but overestimate the cross sections by 10-20% for missing momenta between 0.1 GeV/c and 0.2 GeV/c.

Published
2008
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17. Publisher's Note: Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer [Phys. Rev. C 71, 055202 (2005)]

Author

R. J. Woo, Justin I. McIntyre, K. Wijesooriya, M. Khayat, P.Y. Bertin, C. F. Perdrisat, E. A. J. M. Offermann, Riad Suleiman, Y. Roblin, X. Jiang, A. Gasparian, R. A. Lindgren, J. J. LeRose, L. S. Cardman, J. Berthot, S. Malov, P. Vernin, J. A. Templon, L. Bimbot, V. Gorbenko, B. Diederich, D. S. Brown, Bogdan Wojtsekhowski, L. Todor, S. K. Nanda, S. Churchwell, Z. L. Zhou, Richard Madey, M. K. Jones, N. M. Piskunov, Shalev Gilad, E. Chudakov, K. A. Aniol, D. S. Dale, H. Voskanyan, Nilanga Liyanage, Brian Raue, G. M. Huber, F. Garibaldi, T. Saito, George Dan Zainea, G. G. Petratos, M. Kuss, Laird Kramer, A. V. Glamazdin, Z. Chai, G. Rutledge, David L. Prout, G. J. Kumbartzki, E. Lakuriki, G. J. Lolos, M. B. Epstein, G. Laveissière, B. D. Milbrath, C. Glashausser, Mauro Iodice, Lubomir Pentchev, S. Frullani, J. Y. Mougey, R. Roche, R. Michaels, A. Deur, R. L. Meer, A. J. Sarty, J. P. Chen, C. W. Jager, M. Liang, G. Quéméner, Branislav Vlahovic, H. Fonvieille, Andre Fleck, G. M. Urciuoli, C. R. Howell, J. R. Calarco, C. C. Chang, E. J. Brash, A. Green, D. J. Margaziotis, William Bertozzi, T. Smith, Ronald Gilman, J. Gao, R. I. Pomatsalyuk, Pavel Sorokin, Pete Markowitz, P. E. Ulmer, Kevin Fissum, W. Kahl, R. De Leo, K. McCormick, W.U. Boeglin, S. Strauch, G. M. Gerstner, J.-O. Hansen, Z. Papandreou, A. Besson, P. M. Rutt, Ronald Ransome, J. Domingo, F. Xiong, A. Saha, S. Jaminion, E. Cisbani, F. T. Baker, V. A. Punjabi, Jonatan Piedra Gomez, R. Macri, James J. Kelly, L. A. Ewell, and K. Takahashi

Subjects
Physics, Elastic scattering, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, Polarization (waves), 01 natural sciences, Typographical error
Abstract

This paper was published online on 20 May 2005 without several of the authors' corrections incorporated. Equation (13) has been replaced. The captions of Figs. 16--18 have also been replaced. Typographical errors on pages 4, 6, 14, 15, 18, 19, 22, and 24 have all been corrected. The paper has been corrected as of 8 June 2005. The text is correct in the printed version of the journal.

Published
2005
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18. Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton Scattering atQ2=0.92and1.76 GeV2

Author

G. Laveissière, L. Todor, N. Degrande, S. Jaminion, C. Jutier, R. Di Salvo, L. Van Hoorebeke, L. C. Alexa, B. D. Anderson, K. A. Aniol, K. Arundell, G. Audit, L. Auerbach, F. T. Baker, M. Baylac, J. Berthot, P. Y. Bertin, W. Bertozzi, L. Bimbot, W. U. Boeglin, E. J. Brash, V. Breton, H. Breuer, E. Burtin, J. R. Calarco, L. S. Cardman, C. Cavata, C.-C. Chang, J.-P. Chen, E. Chudakov, E. Cisbani, D. S. Dale, C. W. de Jager, R. De Leo, A. Deur, N. d'Hose, G. E. Dodge, J. J. Domingo, L. Elouadrhiri, M. B. Epstein, L. A. Ewell, J. M. Finn, K. G. Fissum, H. Fonvieille, G. Fournier, B. Frois, S. Frullani, C. Furget, H. Gao, J. Gao, F. Garibaldi, A. Gasparian, S. Gilad, R. Gilman, A. Glamazdin, C. Glashausser, J. Gomez, V. Gorbenko, P. Grenier, P. A. M. Guichon, J. O. Hansen, R. Holmes, M. Holtrop, C. Howell, G. M. Huber, C. E. Hyde-Wright, S. Incerti, M. Iodice, J. Jardillier, M. K. Jones, W. Kahl, S. Kato, A. T. Katramatou, J. J. Kelly, S. Kerhoas, A. Ketikyan, M. Khayat, K. Kino, S. Kox, L. H. Kramer, K. S. Kumar, G. Kumbartzki, M. Kuss, A. Leone, J. J. LeRose, M. Liang, R. A. Lindgren, N. Liyanage, G. J. Lolos, R. W. Lourie, R. Madey, K. Maeda, S. Malov, D. M. Manley, C. Marchand, D. Marchand, D. J. Margaziotis, P. Markowitz, J. Marroncle, J. Martino, K. McCormick, J. McIntyre, S. Mehrabyan, F. Merchez, Z. E. Meziani, R. Michaels, G. W. Miller, J. Y. Mougey, S. K. Nanda, D. Neyret, E. A. J. M. Offermann, Z. Papandreou, B. Pasquini, C. F. Perdrisat, R. Perrino, G. G. Petratos, S. Platchkov, R. Pomatsalyuk, D. L. Prout, V. A. Punjabi, T. Pussieux, G. Quémenér, R. D. Ransome, O. Ravel, J. S. Real, F. Renard, Y. Roblin, D. Rowntree, G. Rutledge, P. M. Rutt, A. Saha, T. Saito, A. J. Sarty, A. Serdarevic, T. Smith, G. Smirnov, K. Soldi, P. Sorokin, P. A. Souder, R. Suleiman, J. A. Templon, T. Terasawa, R. Tieulent, E. Tomasi-Gustaffson, H. Tsubota, H. Ueno, P. E. Ulmer, G. M. Urciuoli, M. Vanderhaeghen, R. Van De Vyver, R. L. J. Van der Meer, P. Vernin, B. Vlahovic, H. Voskanyan, E. Voutier, J. W. Watson, L. B. Weinstein, K. Wijesooriya, R. Wilson, B. B. Wojtsekhowski, D. G. Zainea, W-M. Zhang, J. Zhao, and Z.-L. Zhou

Subjects
Physics, Proton, 010308 nuclear & particles physics, Scattering, Momentum transfer, Compton scattering, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Paramagnetism, Dipole, Pion, Polarizability, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract

We report a virtual Compton scattering study of the proton at low c.m. energies. We have determined the structure functions P(LL)-P(TT)/epsilon and P(LT), and the electric and magnetic generalized polarizabilities (GPs) alpha(E)(Q2) and beta(M)(Q2) at momentum transfer Q(2)=0.92 and 1.76 GeV2. The electric GP shows a strong falloff with Q2, and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a falloff; this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q2, compensated at higher Q2 by a paramagnetic contribution from piN intermediate states.

Published
2004
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19. Measurement of the generalized polarizabilities of the proton in virtual Compton scattering at Q2=0.92 and 1.76 GeV2

Author

G, Laveissière, L, Todor, N, Degrande, S, Jaminion, C, Jutier, R, Di Salvo, L, Van Hoorebeke, L C, Alexa, B D, Anderson, K A, Aniol, K, Arundell, G, Audit, L, Auerbach, F T, Baker, M, Baylac, J, Berthot, P Y, Bertin, W, Bertozzi, L, Bimbot, W U, Boeglin, E J, Brash, V, Breton, H, Breuer, E, Burtin, J R, Calarco, L S, Cardman, C, Cavata, C-C, Chang, J-P, Chen, E, Chudakov, E, Cisbani, D S, Dale, C W, de Jager, R, De Leo, A, Deur, N, d'Hose, G E, Dodge, J J, Domingo, L, Elouadrhiri, M B, Epstein, L A, Ewell, J M, Finn, K G, Fissum, H, Fonvieille, G, Fournier, B, Frois, S, Frullani, C, Furget, H, Gao, J, Gao, F, Garibaldi, A, Gasparian, S, Gilad, R, Gilman, A, Glamazdin, C, Glashausser, J, Gomez, V, Gorbenko, P, Grenier, P A M, Guichon, J O, Hansen, R, Holmes, M, Holtrop, C, Howell, G M, Huber, C E, Hyde-Wright, S, Incerti, M, Iodice, J, Jardillier, M K, Jones, W, Kahl, S, Kato, A T, Katramatou, J J, Kelly, S, Kerhoas, A, Ketikyan, M, Khayat, K, Kino, S, Kox, L H, Kramer, K S, Kumar, G, Kumbartzki, M, Kuss, A, Leone, J J, LeRose, M, Liang, R A, Lindgren, N, Liyanage, G J, Lolos, R W, Lourie, R, Madey, K, Maeda, S, Malov, D M, Manley, C, Marchand, D, Marchand, D J, Margaziotis, P, Markowitz, J, Marroncle, J, Martino, K, McCormick, J, McIntyre, S, Mehrabyan, F, Merchez, Z E, Meziani, R, Michaels, G W, Miller, J Y, Mougey, S K, Nanda, D, Neyret, E A J M, Offermann, Z, Papandreou, B, Pasquini, C F, Perdrisat, R, Perrino, G G, Petratos, S, Platchkov, R, Pomatsalyuk, D L, Prout, V A, Punjabi, T, Pussieux, G, Quémenér, R D, Ransome, O, Ravel, J S, Real, F, Renard, Y, Roblin, D, Rowntree, G, Rutledge, P M, Rutt, A, Saha, T, Saito, A J, Sarty, A, Serdarevic, T, Smith, G, Smirnov, K, Soldi, P, Sorokin, P A, Souder, R, Suleiman, J A, Templon, T, Terasawa, R, Tieulent, E, Tomasi-Gustaffson, H, Tsubota, H, Ueno, P E, Ulmer, G M, Urciuoli, M, Vanderhaeghen, R, Van De Vyver, R L J, Van der Meer, P, Vernin, B, Vlahovic, H, Voskanyan, E, Voutier, J W, Watson, L B, Weinstein, K, Wijesooriya, R, Wilson, B B, Wojtsekhowski, D G, Zainea, W-M, Zhang, J, Zhao, and Z-L, Zhou

Abstract

We report a virtual Compton scattering study of the proton at low c.m. energies. We have determined the structure functions P(LL)-P(TT)/epsilon and P(LT), and the electric and magnetic generalized polarizabilities (GPs) alpha(E)(Q2) and beta(M)(Q2) at momentum transfer Q(2)=0.92 and 1.76 GeV2. The electric GP shows a strong falloff with Q2, and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a falloff; this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q2, compensated at higher Q2 by a paramagnetic contribution from piN intermediate states.

Published
2003

20. Corrections to the one-photon approximation in the0+→2+transition of12C

Author

F. Ghio, J.E. Ducret, J. Marroncle, S. Frullani, P. Vernin, J. Morgenstern, Paul Gueye, E. A. J. M. Offermann, A. Zghiche-Lakéhal-Ayat, J. F. Danel, C. Marchand, Marco Traini, J.-M. Le Goff, M. Bernheim, Z. E. Meziani, L. Lakehal-Ayat, A. Magnon, Vincent Breton, F. Garibaldi, and M. Jodice

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Photon, 010308 nuclear & particles physics, Particle accelerator, Electron, Inelastic scattering, 01 natural sciences, Linear particle accelerator, law.invention, Nuclear physics, law, Excited state, 0103 physical sciences, Atomic physics, Born approximation, 010306 general physics
Abstract

Contribution of higher order effects to the one-photon exchange approximation were studied in the first excited state of 12C by comparing inclusive inelastic scattering cross sections of electrons and positrons obtained at the Saclay Linear Accelerator. The data were compared to a distorted wave Born approximation (DWBA) calculation. The results indicate an effect less than 2% within 2, compatible with what was observed in recent elastic scattering measurements

Published
2001
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21. High-accuracy comparison of electron and positron scattering from nuclei

Author

P. Bricault, L. S. Cardman, L. C. Maximon, D.B. Isabelle, E. A. J. M. Offermann, X. H. Phan, S. Platchkov, B. Frois, Ingo Sick, Vincent Breton, S. E. Williamson, G. Masson, A. J. Linzey, and D. Goutte

Subjects
Nuclear reaction, Physics, Elastic scattering, Positron, Angular distribution, Scattering, General Physics and Astronomy, Charge (physics), Electron, Born approximation, Atomic physics
Abstract

We compare the elastic-scattering cross sections for electrons and positrons from {sup 208}Pb and {sup 12}C. The results demonstrate that the electron-nucleus interaction can be described to good accuracy as a single hard-photon exchange process, and validate the theoretical framework used to interpret electron-scattering data in terms of ground-state charge densities of nuclei.

Published
1991

22. No evidence for medium effects in the12C(e, e'p)11Bg.s. reaction

Author

A. Serdarevic, V. Kunde, J. Lac, M. Korn, R. Neuhausen, S. Wolf, M. O. Distler, Th. Walcher, M. Kahrau, Achim Richter, W.U. Boeglin, K. Merle, B. Vodenik, R. Geiges, Th. Pospischil, R. Böhm, J.M. Friedrich, P. Sauer, S. Schardt, K. I. Blomqvist, Th. Veit, G. Rosner, A. Wagner, K. W. Krygier, R. Edelhoff, M. Potokar, A. Rokavec, E. A. J. M. Offermann, A. Liesenfeld, H. Kramer, and M. Kuss

Subjects
Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Proton, Form factor (quantum field theory), Analytical chemistry, Nuclear fusion
Abstract

The12C(e, e'p)11B g.s reaction has been measured in parallel and anti-parallel kinematics over ap m range of −120

Published
1995
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