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26 results on '"S. Kerhoas"'

1. Counting Rates Modeling for PET Scanners With GATE

Author

P. F. Honore, C. Comtat, F. Bataille, David Guez, S. Kerhoas, and Sébastien Jan

Subjects
Nuclear and High Energy Physics, Engineering, Noise measurement, Noise (signal processing), business.industry, Bandwidth (signal processing), Detector, Dead time, Coincidence, Background noise, Nuclear Energy and Engineering, Logic gate, Electrical and Electronic Engineering, business, Simulation
Abstract

Several developments were made in the GATE simulation platform to allow accurate modeling of the count rate performances of PET scanners over a wide range of activity concentrations. A background noise module, a dead time and limited bandwidth modeling for the coincidences, and a delayed coincidence builder were added in the code. The results obtained for the modeling of the ECAT HRRT and Focus 220 scanners with the newly developed modules are discussed. They show that GATE can be used to accurately simulate the single event, prompt coincidence and delayed coincidence rates, from very low activity levels in the field of view up to levels that saturate the acquisition system. The new developments were committed into the public release of GATE, making them available for the whole community, thanks to the open source license under which GATE is published (LGPL).

Published
2008
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2. Monte Carlo simulation of virtual Compton scattering below pion threshold

Author

Ch. Hyde-Wright, Marc Vanderhaeghen, J.M. Friedrich, D. Marchand, P.Y. Bertin, N. Degrande, Harald Merkel, David Lhuillier, R. Van de Vyver, R. Di Salvo, J. Roche, P. Janssens, M. O. Distler, G. Tamas, J. Van de Wiele, I. K. Bensafa, H. Fonvieille, Luca Doria, S. Kerhoas, N. d'Hose, Th. Walcher, L. Van Hoorebeke, S. Jaminion, G. Laveissière, 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), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), VCS, and 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)

Subjects
Physics, Nuclear and High Energy Physics, Photon, 010308 nuclear & particles physics, Monte Carlo method, Compton scattering, Solid angle, Probability and statistics, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Pion, Physics - Data Analysis, Statistics and Probability, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Nuclear Experiment, 010306 general physics, Instrumentation, [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an]
Abstract

This paper describes the Monte Carlo simulation developed specifically for the VCS experiments below pion threshold that have been performed at MAMI and JLab. This simulation generates events according to the (Bethe-Heitler + Born) cross section behaviour and takes into account all relevant resolution-deteriorating effects. It determines the `effective' solid angle for the various experimental settings which are used for the precise determination of photon electroproduction absolute cross section., Comment: 24 pages, 6 figures, to be published in Nuclear Instruments and Methods in Physics Research, A One author added

Published
2006
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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. The CO2 gas Cherenkov detectors for the Jefferson Lab Hall-A spectrometers

Author

Fabio Santavenere, L. Pierangeli, R. Crateri, Roberto Perrino, M. Gricia, L. Lagamba, E. Cisbani, P. Vernin, M. Iodice, B. Mazeav, Salvatore Frullani, S. Kerhoas, A. Mostarda, R. De Leo, A. Leone, G. M. Urciuoli, Fausto Giuliani, Maurizio Lucentini, S. Colilli, I.C. Lugol, A. Zaccarian, and Franco Garibaldi

Subjects
Physics, Nuclear and High Energy Physics, Electron, Photoelectric effect, Wavelength shifter, Radiation, Radiation length, Particle detector, Nuclear physics, Delta ray, Physics::Accelerator Physics, Nuclear Experiment, Instrumentation, Cherenkov radiation
Abstract

Two threshold gas Cherenkov counters have been constructed for the electron and hadron High Resolution Spectrometers (HRS) of the Jefferson Lab Experimental Hall A. These counters are intended to separate electrons/positrons from other particles up to 4 GeV/c. The counters are operated at atmospheric pressure with CO2. Each counter is equipped with ten mirrors. Lightweight, thin, spherical mirrors (5.5 + 10{sup {minus}3} radiation lengths) have been employed resulting in a total thickness of 1.4 + 10{sup {minus}2} radiation lengths crossed by the particles. A prototype of the counter has been tested at CERN with a mixed beam of positrons, pions, and protons from 1 to 4 GeV/c. Its detection efficiency for positrons and the rejection ratios for pions and protons have been measured as a function of the pulse height response (or equivalently the number of photoelectrons). An improvement of 34% in the number of photoelectrons has been obtained by using a wavelength shifter coated on the photocathode glass window. With such an improvement in 1 m long radiator, an inefficiency for positrons less than 10{sup {minus}3} and rejection ratios pi/e at the level of few 10{sup {minus}3} and p/e smaller than 10{sup {minus}3} have been obtained for pulse heights above 2 photoelectrons. Contaminations of particles below the Cherenkov threshold is fully understood considering delta-rays production.

Published
1998
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6. Study of three-nucleon mechanisms in the photodisintegration of 3He

Author

J. R. M. Annand, P. Pedroni, M. Mac Cormick, G. Audit, R. Crawford, N. d'Hose, V. Isbert, P. Grabmayr, J.M. Laget, S. Kerhoas, J. D. Kellie, T. Pinelli, A. Panzeri, J. Ahrens, L. Y. Murphy, G. Tamas, S.J. Hall, and A. Braghieri

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Photon, Proton, Nuclear Theory, Photofission, Photon energy, Nuclear physics, Photodisintegration, Physics::Accelerator Physics, Nuclear Experiment, Nucleon, Microtron
Abstract

The cross section of the 3He(γ,pp)n reaction has been measured for the first time over a wide photon energy and proton angular range (200 MeV ≤ Eγ ≤ 800 MeV; 20° ≤ ϑplab ≤ 160°) using the large acceptance detector DAPHNE at the tagged photon facility of the MAMI microtron in Mainz. The wide kinematical coverage of the measurement has allowed a detailed analysis of three-nucleon absorption mechanisms. A model developed by Laget explains the main characteristics of the data in the Δ resonance region.

Published
1997
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7. Two-body photodisintegration of the deuteron from 100 to 800 MeV

Author

Saverio Altieri, I. Anthony, J. D. Kellie, L. Y. Murphy, R. Medaglia, T. Pinelli, P. Pedroni, S.J. Hall, A. Braghieri, J. Ahrens, Jrm Annand, M. MacCormick, R. Beck, N. d'Hose, G. Tamas, J.C. MacGeorge, R.O. Owens, P.A. Wallace, V. Isbert, G. Audit, G.J. Miller, R. Crawford, and S. Kerhoas

Subjects
Nuclear physics, Nuclear reaction, Physics, Nuclear and High Energy Physics, Photon, Proton, Deuterium, Spectrometer, Photodisintegration, Physics::Accelerator Physics, Photon energy, Nuclear Experiment, Microtron
Abstract

The total and the differential cross sections for the D(γ,p)n reaction have been measured over the photon energy range 100-800 MeV at the 855 MeV MAMI Microtron in Mainz. Using the large acceptance detector DAPHNE in conjunction with the Glasgow tagging spectrometer, high precision results with small systematic errors were obtained. The data are presented in the form of thirty-five angular distributions at c.m. proton angles between 30°–160° in 10° intervals and at photon energies in steps of 20 MeV. Previous experimental work is reassessed in the light of the present results and comparison with some recent theoretical calculations.

Published
1996
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8. Total photoabsorption cross sections forH1,H2, andHe3from 200 to 800 MeV

Author

P.A. Wallace, M. MacCormick, Alessandro Braghieri, S. Kerhoas, G. Audit, P. Pedroni, Saverio Altieri, R. Beck, L. Ghedira, T. Pinelli, J. R. M. Annand, J. Ahrens, N. d'Hose, V. Isbert, J. D. Kellie, G. Tamas, B. Dolbilkin, L. Y. Murphy, I. J. D. MacGregor, R. A. Crawford, and Anton Zabrodin

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Photon, Nuclear Theory, Resonance, Absorption (logic), Photon beam, Atomic physics, Nuclear Experiment, Nucleon
Abstract

The total photoabsorption cross sections for $^{1}\mathrm{H}$, $^{2}\mathrm{H}$, and $^{3}\mathrm{He}$ have been measured for incident photon energies ranging from 200 to 800 MeV. The $^{3}\mathrm{He}$ data are the first for this nucleus. By using the large acceptance detector DAPHNE in conjunction with the tagged photon beam facility of the MAMI accelerator in Mainz, cross sections of high precision have been obtained. The results show clearly the changes in the nucleon resonances in going from $^{1}\mathrm{H}$ to $^{3}\mathrm{He}$. In particular, for the ${\mathit{D}}_{13}$ region the behavior for $^{3}\mathrm{He}$ is intermediate between that for $^{1}\mathrm{H}$, $^{2}\mathrm{H}$, and heavier nuclei. This will provide a strong constraint to the theories that are presently being developed with a view to explaining the apparent ``damping'' of higher resonances in heavy nuclei. \textcopyright{} 1996 The American Physical Society.

Published
1996
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9. Virtual Compton scattering and the generalized polarizabilities of the proton atQ2=0.92and 1.76 GeV2

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Chiral perturbation theory, Proton, 010308 nuclear & particles physics, Structure function, Compton scattering, 01 natural sciences, Nuclear physics, Amplitude, Dispersion relation, 0103 physical sciences, Beta (velocity), 010306 general physics
Abstract

Virtual Compton Scattering (VCS) on the proton has been studied at Jefferson Lab using the exclusive photon electroproduction reaction (e p --> e p gamma). This paper gives a detailed account of the analysis which has led to the determination of the structure functions P{sub LL}-P{sub TT}/epsilon and P{sub LT}, and the electric and magnetic generalized polarizabilities (GPs) alpha{sub E}(Q{sup 2}) and beta{sub M}(Q{sup 2}) at values of the four-momentum transfer squared Q{sup 2} = 0.92 and 1.76 GeV{sup 2}. These data, together with the results of VCS experiments at lower momenta, help building a coherent picture of the electric and magnetic GPs of the proton over the full measured Q{sup 2}-range, and point to their non-trivial behavior.

Published
2012
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10. Two-body photodisintegration of 3He between 200 and 800 MeV

Author

T. Pinelli, R. Crawford, S.J. Hall, N. d'Hose, J. D. Kellie, G.J. Miller, J. R. M. Annand, J. Peise, Alessandro Braghieri, M. Mac Cormick, Saverio Altieri, L.Y. Murphy, S. Kerhoas, G. Audit, V. Isbert, P.A. Wallace, R. Beck, I. Anthony, G. Tamas, P. Pedroni, and J. Ahrens

Subjects
Nuclear physics, Physics, Nuclear reaction, Nuclear and High Energy Physics, Photon, Angular distribution, Proton, Photodisintegration, Detector, Physics::Accelerator Physics, Atomic physics, Photon beam, Nuclear Experiment
Abstract

Differential cross sections for the 3He(γ,pd) reaction at photon energies between 200 and 800 MeV at all proton c.m. angles between 35° and 145° have been measured using the tagged photon beam facility of the 855 MeV MAMI accelerator in Mainz. Reaction products were detected using the large acceptance detector DAPHNE. The results confirm the rapid decrease of forward-angle cross sections with increasing Eγ whilst at backward angles, aided by the high precision of the measurement, we can see a clear enhancement in the angular distribution which is a possible signature of three-body mechanisms.

Published
1994
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11. A range telescope technique for particle discrimination and energy reconstruction

Author

G. Audit, T. Pinelli, N. d'Hose, P. Pedroni, G. Tamas, R. Crawford, A. Braghieri, L. Y. Murphy, M. Mac Cormick, S. Kerhoas, and V. Isbert

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), business.industry, Detector, Resolution (electron density), Scintillator, law.invention, Telescope, Momentum, Optics, Sampling (signal processing), law, business, Instrumentation, Energy (signal processing)
Abstract

We present an analysis technique (“range method”) that optimizes particle discrimination and enables energy reconstruction using a sampling detector. The method is a powerful extension of the well known dEdx - E technique in which the energy loss rate measured by several scintillator layers is fitted on the theoretical energy-range curves. The general features of the method will be discussed and its application to nuclear physics investigations at intermediate energies with the DAPHNE detector. Momentum reconstruction for protons with a resolution of ΔPP = 2.5−10% (FWHM) in the range P = 300–900 MeV/c has been obtained.

Published
1994
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12. Virtual Compton Scattering and Neutral Pion Electroproduction in the Resonance Region up to the Deep Inelastic Region at Backward Angles

Author

Seigo Kato, H. Ueno, K. Wijesooriya, R. Di Salvo, L. C. Alexa, G. W. Miller, H. Voskanyan, C. Jutier, J. Jardillier, E. Voutier, J. A. Templon, G. Rutledge, B. Frois, D. G. Zainea, C. C. Chang, E. Chudakov, David L. Prout, G. Laveissière, T. Terasawa, Vincent Breton, Mauro Iodice, Bogdan Wojtsekhowski, K. S. Kumar, Latifa Elouadrhiri, J. O. Hansen, A. Gasparian, K. Arundell, Pavel Sorokin, Sebastien Incerti, Larry Weinstein, P. Grenier, R. W. Lourie, W. Kahl, J. Berthot, G. Audit, L. B. Auerbach, T. Pussieux, G. Fournier, William Bertozzi, A. Deur, P. Vernin, Pierre A.M. Guichon, Ronald Ransome, Kazushige Maeda, K. Kino, N. Degrande, Pete Markowitz, D. Rowntree, Z. Papandreou, R. L.J. van der Meer, A. T. Katramatou, T. Saito, Richard Madey, Paul Souder, P. M. Rutt, S. K. Nanda, Roberto Perrino, R. De Leo, D. S. Dale, S. Mehrabyan, S. Kerhoas, J. M. Finn, W. U. Boeglin, D. J. Margaziotis, R. I. Pomatsalyuk, A. Ketikyan, L. Todor, A. Leone, M. Baylac, S. Jaminion, Nilanga Liyanage, S. Malov, E. Burtin, M. Holtrop, Thomas E. Smith, Richard Wilson, G. E. Dodge, R. Holmes, J. Marroncle, D. Marchand, E. Tomasi-Gustaffson, S. Platchkov, J. S. Real, J. Martino, Raphael Noel Tieulent, G.I. Smirnov, J. P. Chen, R. Van de Vyver, G. M. Urciuoli, Branislav Vlahovic, R. A. Lindgren, J. J. LeRose, C. R. Howell, Justin I. McIntyre, J. R. Calarco, L. Tiator, L. Bimbot, Arijit Saha, K. Soldi, O. Ravel, Hiroaki Tsubota, A. Serdarevic, C. E. Hyde, Y. Roblin, J. Y. Mougey, G. M. Huber, F. Garibaldi, E. Cisbani, J. Gomez, V. Gorbenko, J. W. Watson, F. Renard, L. Cardman, B. D. Anderson, G. J. Lolos, M. B. Epstein, F. T. Baker, F. Merchez, P. Y. Bertin, Haiyan Gao, M. Liang, G. Quéméner, D. Neyret, N. d'Hose, S. Frullani, Charles Glashausser, M. Khayat, H. Breuer, D. M. Manley, J. Gao, L. Van Hoorebeke, G. G. Petratos, Z. E. Meziani, V. A. Punjabi, L. A. Ewell, Ronald Gilman, K. McCormick, H. Fonvieille, Z. L. Zhou, A. V. Glamazdin, S. Kox, Jing Zhao, C. F. Perdrisat, R. Michaels, C. Marchand, M. K. Jones, C. Furget, P. E. Ulmer, Kevin Fissum, M. Kuss, James J. Kelly, E. J. Brash, Laird Kramer, Shalev Gilad, C. W. de Jager, K. A. Aniol, E. A.J.M. Offermann, C. Cavata, S.S. Kamalov, G. J. Kumbartzki, A. J. Sarty, W. M. Zhang, R. Suleiman, J. Domingo, 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), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), HALL A, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Compton scattering, Resonance, FOS: Physical sciences, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Deep inelastic scattering, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment
Abstract

We have made the first measurements of the virtual Compton scattering (VCS) process via the H$(e,e'p)\gamma$ exclusive reaction in the nucleon resonance region, at backward angles. Results are presented for the $W$-dependence at fixed $Q^2=1$ GeV$^2$, and for the $Q^2$-dependence at fixed $W$ near 1.5 GeV. The VCS data show resonant structures in the first and second resonance regions. The observed $Q^2$-dependence is smooth. The measured ratio of H$(e,e'p)\gamma$ to H$(e,e'p)\pi^0$ cross sections emphasizes the different sensitivity of these two reactions to the various nucleon resonances. Finally, when compared to Real Compton Scattering (RCS) at high energy and large angles, our VCS data at the highest $W$ (1.8-1.9 GeV) show a striking $Q^2$- independence, which may suggest a transition to a perturbative scattering mechanism at the quark level., Comment: 20 pages, 8 figures. To appear in Phys.Rev.C

Published
2009
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13. Dynamics of the quasielasticO16(e,e′p)reaction atQ2≈0.8(GeV∕c)2

Author

A. V. Glamazdin, E. A.J.M. Offermann, Seigo Kato, D. M. Manley, H. Fonvieille, R. Roche, S. Malov, P.Y. Bertin, E. Burtin, M. Holtrop, J. Gomez, Jing Zhao, Nilanga Liyanage, R. W. Lourie, R. Michaels, S. Jaminion, R. Holmes, T. Terasawa, Vincent Breton, D. J. Margaziotis, Branislav Vlahovic, H. Voskanyan, C. Jutier, W. Kahl, F. T. Baker, C. F. Perdrisat, Leonid Levchuk, J. M. Finn, R. I. Pomatsalyuk, V. A. Punjabi, K. Joo, David L. Prout, Olivier Ravel, H. Ueno, Bogdan Wojtsekhowski, K. McCormick, P. Vernin, P. E. Ulmer, S. K. Nanda, S. Kerhoas, J. Y. Mougey, L. B. Auerbach, A. Leone, T. Pussieux, L. S. Cardman, Y. Roblin, S. van Verst, R. A. Lindgren, J. J. LeRose, G. M. Huber, Z. Papandreou, J. A. Templon, F. Garibaldi, T. Saito, M. Khayat, Dimitri Debruyne, P. M. Rutt, V. Gorbenko, B. Frois, Kevin Fissum, D. Neyret, G. G. Petratos, A. Saha, Z. E. Meziani, B. Diederich, C. E. Hyde-Wright, G. Rutledge, L. Bimbot, James J. Kelly, K. Kino, M. Liang, Wolfgang Korsch, J. S. McCarthy, T. P. Smith, G. Quéméner, S. Platchkov, Mauro Iodice, Kazushige Maeda, L. Todor, K. Wijesooriya, Justin I. McIntyre, J. W. Watson, Larry Weinstein, J. Martino, C. R. Howell, Hiroaki Tsubota, J. P. Chen, J. R. Calarco, N. d'Hose, Jan Ryckebusch, Z. L. Zhou, G. M. Urciuoli, D. G. Zainea, Ronald Gilman, Ronald Ransome, R. L.J. van der Meer, C. C. Chang, D. Rowntree, K. S. Kumar, J. Gao, B. D. Anderson, G. J. Lolos, M. B. Epstein, Pavel Sorokin, Laird Kramer, G. J. Kumbartzki, G. Laveissière, M. K. Jones, A. Gasparian, R. Madey, William Bertozzi, W. U. Boeglin, Pete Markowitz, D. S. Dale, M. Khandaker, V. Zeps, Roberto Perrino, R. De Leo, E. Cisbani, J. Berthot, S. Frullani, H. Breuer, E. J. Brash, J. R. Vignote, T. P. Gorringe, J. M. Udías, F. W. Hersman, L. A. Ewell, J. Domingo, Gordon D. Cates, Paul Souder, A. Serdarevic-Offermann, A. Deur, C. Cavata, A. Soldi, J.E. Ducret, A. J. Sarty, P. Djawotho, C. Glashausser, R. Suleiman, Shalev Gilad, C. W. de Jager, and K. A. Aniol

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Two-body problem, 01 natural sciences, Asymmetry, Eikonal approximation, Nuclear physics, Classical mechanics, 0103 physical sciences, Isobar, 010306 general physics, Relativistic quantum chemistry, Glauber, Oxygen-16, media_common
Abstract

The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the ^(16)O(e,e′p) reaction in quasielastic, constant (q,ω) kinematics at Q^2≈0.8(GeV/c)^2, q≈1GeV/c, and ω≈445MeV. Use of a self-calibrating, self-normalizing, thin-film waterfall target enabled a systematically rigorous measurement. Five-fold differential cross-section data for the removal of protons from the 1p-shell have been obtained for 0

Published
2004
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14. Backward electroproduction ofπ0mesons on protons in the region of nucleon resonances at four momentum transfer squaredQ2=1.0GeV2

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Momentum transfer, Sigma, 01 natural sciences, Nuclear physics, Baryon, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Lepton
Abstract

Exclusive electroproduction of pi{sup 0} mesons on protons in the backward hemisphere has been studied at Q2 = 1.0 GeV2 by detecting protons in the forward direction in coincidence with scattered electrons from the 4 GeV electron beam in Jefferson Lab's Hall A. The data span the range of the total (gamma*p) center-of-mass energy W from the pion production threshold to W = 2.0 GeV. The differential cross sections sigma{sub T} + epsilon sigma{sub L}, sigma{sub TL}, and sigma{sub TT} were separated from the azimuthal distribution and are presented together with the MAID and SAID parameterizations.

Published
2004
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15. Basic instrumentation for Hall A at Jefferson Lab

Author

T. Pussieux, Paul Souder, J. H. Mitchell, Y. Roblin, O. Ravel, E. Chudakov, K. A. Griffioen, C. Cavata, J. A. Templon, H. F. Ibrahim, J. S. McCarthy, M. A. Stevens, D. P. Watts, B. Frois, W. J. Schneider, Dipangkar Dutta, R. Di Salvo, R. I. Pomatsalyuk, A. Soldi, G. J. Kumbartzki, Arijit Saha, N. Colombel, J. Berthot, Jing Zhao, A. J. Sarty, B. D. Anderson, J. Martine, M. Coman, R. Michaels, M. B. Epstein, R. W. Lourie, J. O. Hansen, N. Degrande, J. Mclntyre, John Arrington, L. Zhu, W. Kahl, Bogdan Wojtsekhowski, P. Djawotho, M. Leuschner, William Bertozzi, K. A. Aniol, A. Gasparian, Karl Slifer, Jrm Annand, C. F. Perdrisat, D. Pripstein, M. Baylac, S. Kox, X. Jiang, K. Kramer, H. Breuer, David Hamilton, Jian-Ping Chen, T. Averett, L. B. Auerbach, G. A. Rutledge, G. Quéméner, Stephanie Escoffier, P.Y. Bertin, R. Suleiman, R. Carr, Pete Markowitz, A. Deur, Z. Papandreou, R. L. Walter, R. D. McKeown, T. P. Gorringe, M. Rvachev, R. Holmes, S. Churchwell, J. Marroncle, S. Platchkov, M. Khandaker, M. Liang, L. Pierangeli, K. Kino, A. Ketikyan, Kevin Fissum, F. W. Hersman, J. LeRose, F. Giuliani, P. E. Ulmer, Roberto Perrino, R. De Leo, J. Gao, L. A. Ewell, S. Jensen, R. Crateri, Shalev Gilad, C. W. de Jager, D. Lhuillier, J.E. Ducret, M. Gricia, R. Iommi, F. Sabatavenere, P. A. Zolnierczuk, K. Wijesooriya, Alan M. Nathan, D. Rowntree, E. Voutier, H. Holmgren, S. K. Nanda, D. G. Meekins, K. S. Egiyan, C. R. Howell, A. Serdarevic-Offermann, Hiroaki Tsubota, D. G. Zainea, J. R. Calarco, S. Esp, T. Terasawa, Vincent Breton, C. C. Chang, J. Domingo, T. Black, A. T. Katramatou, S. Kerhoas, F. Santavenere, J. Y. Mougey, R. Van de Vyver, G. M. Urciuoli, Seigo Kato, G. M. Huber, B. Reitz, E. J. Beise, K. S. Kumar, F. Garibaldi, Pavel Sorokin, G. J. Lolos, M. Lucentini, J. Segal, H. Xiang, D. V. Boykin, W. U. Boeglin, C. Glashausser, E. Cisbani, A. Leone, R. D. Ransomez, Gordon D. Cates, Sonja Dieterich, H. Voskanyan, C. Jutier, R. L.J. van der Meer, Olivier Gayou, James A. Miller, L. Van Hoorebeke, Sebastien Incerti, J. Jardillier, L. Cardman, James J. Kelly, F. Xiong, S. Jaminion, I. K. Kominis, K. McCormick, P. Vernin, P. M. Rutt, A. Petrosyan, David L. Prout, Nilanga Liyanage, L. Lagamba, X. Zheng, S. L. Spiegel, Branislav Vlahovic, Leonid Levchuk, Mauro Iodice, Larry Weinstein, F. Marie, D. G. Ireland, N. S. Chant, David Manley, V. A. Punjabi, C. E. Jones, J. Gomez, Wolfgang Korsch, W. Xu, J. W. Watson, M. Roedelbronn, F. T. Baker, Z. E. Meziani, T. Saito, S. Frullani, H. Ueno, E. J. Brash, R. Roche, E. Hovhannisyan, C. E. Hyde-Wright, N. d'Hose, L. Bimbot, G. Laveissière, R. Madey, Kazushige Maeda, A. Gavalya, W. Miller, D. Neyret, T. P. Smith, B. Diederich, E. Burtin, M. Holtrop, L. Todor, G. Dezern, Z. L. Zhou, K. Livingston, D. S. Dale, V. Zeps, S. Mayilyan, E. Folts, B. D. Milbrath, Haiyan Gao, J. M. Finn, O. Rondon-Aramayo, R. A. Lindgren, V. Gorbenko, A. V. Glamazdin, Z. Chai, E. A.J.M. Offermann, S. Malov, J. Alcorn, S. Strauch, A. Shahinyan, G. Rosner, H. Fonvieille, P. G. Roos, E. W. Hughes, K. Joo, D. S. Brown, P. Brindza, G. G. Petratos, S. van Verst, M. Khayat, S. Colilli, Douglas Higinbotham, M. K. Jones, D. J. Margaziotis, M. Kuss, Seonho Choi, Ronald Gilman, Thomas Jefferson National Accelerator Facility (Jefferson Lab), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), HALL A, 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), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Cryogenics, Scintillator, 7. Clean energy, 01 natural sciences, Particle identification, Magnetic field, Nuclear physics, Cardinal point, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Nucleon, Instrumentation, Cherenkov radiation
Abstract

The instrumentation in Hall A at the Thomas Jefferson National Accelerator Facility was designed to study electro-and photo-induced reactions at very high luminosity and good momentum and angular resolution for at least one of the reaction products. The central components of Hall A are two identical high resolution spectrometers, which allow the vertical drift chambers in the focal plane to provide a momentum resolution of better than 2 x 10(-4). A variety of Cherenkov counters, scintillators and lead-glass calorimeters provide excellent particle identification. The facility has been operated successfully at a luminosity well in excess of 10(38) CM-2 s(-1). The research program is aimed at a variety of subjects, including nucleon structure functions, nucleon form factors and properties of the nuclear medium. (C) 2003 Elsevier B.V. All rights reserved.

Published
2004
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16. Polarization transfer in the16O(e→,e′p→)15Nreaction

Author

Nilanga Liyanage, Pierre Bertin, Richard Wilson, Branislav Vlahovic, Ronald Ransome, R. Suleiman, E. Cisbani, W. U. Boeglin, J. Gomez, Laird Kramer, E. J. Brash, K. Wijesooriya, D. M. Manley, O. Ravel, J. A. Templon, P. Djawotho, J. Marroncle, J. Domingo, A. Gasparian, A. V. Glamazdin, Gordon D. Cates, K. A. Griffioen, C. Cavata, J. Berthot, B. Frois, A. Soldi, A. J. Sarty, R. I. Pomatsalyuk, Y. Roblin, G. Kumbartzki, R. Roche, T. P. Smith, S. Nanda, C. F. Perdrisat, D. J. Margaziotis, J. Fleniken, T. Terasawa, Vincent Breton, Z. L. Zhou, R. A. Lindgren, J. J. LeRose, Shalev Gilad, C. W. de Jager, Charles Glashausser, V. Gorbenko, K. A. Aniol, M. K. Jones, D. S. Dale, E. A.J.M. Offermann, K. Kino, F. Garibaldi, D. G. Zainea, C. C. Chang, J. S. McCarthy, K. S. Kumar, V. Zeps, A. Serdarevic-Offermann, S. van Verst, Pavel Sorokin, R. W. Lourie, A. Deur, Jian-Ping Chen, Ch. Hyde-Wright, M. Khayat, M. Khandaker, W. Kahl, G. M. Urciuoli, N. d'Hose, Z. Papandreou, Bogdan Wojtsekhowski, G. G. Petratos, Z. E. Meziani, H. Breuer, R. Holmes, B. D. Anderson, G. J. Lolos, M. B. Epstein, Hiroaki Tsubota, F. W. Hersman, R. L.J. van der Meer, L. A. Ewell, Ronald Gilman, K. McCormick, Wolfgang Korsch, L. Cardman, S. Jaminion, Leonid Levchuk, V. A. Punjabi, James J. Kelly, K. Joo, C. R. Howell, P. E. Ulmer, J. W. Watson, S. Kerhoas, J. R. Calarco, S. Frullani, F. T. Baker, P. Vernin, D. Neyret, B. Diederich, T. Saito, G. Rutledge, Mauro Iodice, J. Hines, Larry Weinstein, William Bertozzi, H. Fonvieille, L. Todor, A. Leone, Pete Markowitz, G. Laveissière, R. Madey, Roberto Perrino, R. De Leo, T. P. Gorringe, Paul Souder, Jing Zhao, A. Saha, R. Michaels, G. M. Huber, Justin I. McIntyre, L. Auerbach, M. Liang, G. Quéméner, D. Rowntree, J. Gao, Kevin Fissum, S. Platchkov, J. Martino, J. E. Ducret, T. Pussieux, L. Bimbot, Kazushige Maeda, Seigo Kato, J. M. Finn, J. Mougey, H. Voskanyan, C. Jutier, S. Malov, E. Burtin, M. Holtrop, B. Doyle, P. M. Rutt, David L. Prout, and H. Ueno

Subjects
Physics, Nuclear and High Energy Physics, Mathematics::Probability, Deuterium, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Polarization (waves), 7. Clean energy, 01 natural sciences
Abstract

The first $(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{p})$ polarization transfer measurements on a nucleus heavier than deuterium have been carried out at Jefferson Laboratory. Transverse and longitudinal components of the polarization of protons ejected in the reaction ${}^{16}\mathrm{O}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{p})$ were measured in quasielastic perpendicular kinematics at a ${Q}^{2}$ of 0.8 $(\mathrm{GeV}{/c)}^{2}.$ The data are in good agreement with state of the art calculations.

Published
2000
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17. Virtual Compton Scattering and polarizabilities

Author

P.Y. Bertin, Ch. Hyde-Wright, J.E. Ducret, P. Vernin, S. Kerhoas, M. Weiss, D. Lhuillier, P. Merle, S. Derber, J. Van de Wiele, Daniela Rohe, O. Ravel, Vincent Breton, M. Ding, G. Tamas, J. Mougey, D. Baumann, C. Marchand, A. Wagner, N. D'Hose, K. W. Krygier, Th. Walcher, P. Jennewein, N. Degrande, M. Kahrau, Th. Pospischil, Marc Vanderhaeghen, U. Müller, H. Holvoet, B. Lannoy, P. Bartsch, W.U. Boeglin, P.A.M. Guichon, M. O. Distler, I. Ewald, Y. Roblin, J. Martino, G. Quemener, H. Schmieden, J. Berthot, Michael Tytgat, R. Van de Vyver, G. De Meyer, J.M. Friedrich, D. Marchand, Harald Merkel, G. Rosner, H. Fonvieille, R. Neuhausen, L. Van Hoorebeke, Dirk Ryckbosch, R. Böhm, A. Liesenfeld, J. Marroncle, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and 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)

Subjects
Electromagnetic field, Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Compton scattering, Measure (physics), Observable, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nucleon, Nuclear Experiment, Microtron
Abstract

Virtual Compton Scattering (VCS) off the proton below pion threshold allows access to generalized polarizabilities of the proton. These observables measure the response of the nucleon to low energy electromagnetic field perturbations. This paper presents a comparison with Real Compton Scattering and also results for the first dedicated VCS experiment performed at the Mainz Microtron MAMI with high resolution spectrometers at Q2 = 0.33 GeV2.

Published
1999

18. The first dedicated Virtual Compton Scattering experiment at MAMI

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Photon, Proton, Spectrometer, 010308 nuclear & particles physics, Momentum transfer, Compton scattering, 01 natural sciences, Nuclear physics, Momentum, Amplitude, 0103 physical sciences, Photon polarization, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics
Abstract

We measured the absolute cross sections for photon electro-production off the proton, ep to ep gamma , with the high resolution spectrometers at MAMI at momentum transfer q=600 MeV/c and photon polarization epsilon =0.62. We covered the momentum range for the outgoing real photon q'=33/111 MeV/c. From the extracted virtual Compton scattering amplitude we deduce values for two structure functions related to the generalized polarizabilities of the proton.

Published
1999

19. The first Virtual Compton Scattering experiment at MAMI

Author

V. Kunde, Y. Roblin, A. Liesenfeld, P. Sauer, J. Berthot, P. Merle, P.Y. Bertin, J. Martino, Marc Vanderhaeghen, J. Roche, K. Merle, H. Schmieden, J.M. Friedrich, T. Caprano, S. Kerhoas, S. Schardt, R. Böhm, Daniela Rohe, G. Tamas, M. O. Distler, G. Quéméner, R. Van de Vyver, A. Wagner, O. Ravel, Harald Merkel, Th. Pospischil, Th. Gousset, J.E. Ducret, J. Y. Mougey, I. Ewald, N. d'Hose, P. Jennewein, N. Degrande, Th. Walcher, Michael Tytgat, D. Lhuillier, Ch. Hyde-Wright, R. Edelhoff, G. Rosner, G. De Meyer, H. Fonvieille, D. Marchand, P. Vernin, S. Derber, M. Kahrau, H. Kramer, J. Van de Wiele, Vincent Breton, P. Bartsch, W.U. Boeglin, M. Ding, P.A.M. Guichon, H. Holvoet, R. Geiges, C. Marchand, B. Lannoy, L. Van Hoorebeke, K. W. Krygier, Dirk Ryckbosch, R. Neuhausen, M. Korn, 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), 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), De Sanctis E. Bianchi N. Muccifora V., VCS, Chadelas, Michèle, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Proton, Spectrometer, 010308 nuclear & particles physics, Compton scattering, Virtual particle, Observable, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics, Microtron
Abstract

Virtual Compton scattering, i.e. the exclusive reaction γ ∗ p → γ′p′ with γ ∗ denoting a virtual photon, provides new insights on the internal structure of the proton. Below π 0 production threshold, this experiment measures the generalized polarizabilities of the proton as defined by Guichon et al [1], [2] and Drechsel et al [3]. These new electromagnetic observables, functions of Q 2 , enlarge the concept of electric (α0 and magnetic (β) polarizabilities in Real Compton Scattering ( Q 2 =0) [4]. The first VCS experiment [5] of this kind was measured at the three spectrometer facility at the Mainz Microtron MAMI for Q 2 =0.33 GeV 2 and we present in this paper the preliminary results.

Published
1999

20. A photon calorimeter using lead tungstate crystals for the CEBAF Hall A Compton polarimeter

Author

D. Neyret, T. Pussieux, T. Auger, M. Baylac, E. Burtin, C. Cavata, R. Chipaux, S. Escoffier, N. Falletto, J. Jardillier, S. Kerhoas, D. Lhuillier, F. Marie, C. Veyssière, J. Ahrens, R. Beck, M. Lang, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Physique des Particules de Marseille (CPPM), and Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Particle physics, Photon, lead tungstate scintillator, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), electromagnetic calorimeter, 0103 physical sciences, Compton polarimeter, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Lead tungstate, Photon beam, 010306 general physics, Nuclear Experiment, Instrumentation, ComputingMilieux_MISCELLANEOUS, Physics, CEBAF, Calorimeter (particle physics), 010308 nuclear & particles physics, Polarimeter, Physics::Accelerator Physics
Abstract

The performances of the calorimeter of the Jlab Hall A Compton Polarimeter have been measured using the Mainz tagged photon beam., Comment: 13 pages

Published
1999
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21. Beam energy measurement at TJNAF at a level of ΔE/E=10−4 by determination of the p(e,e’p) kinematics on hydrogen

Author

O. Ravel, J. Berthot, S Kerhoas, D. Lambert, Y. Roblin, G. Savinel, M. Crouau, G. Fournier, P.Y. Bertin, J.C. Lugol, M. Brossard, F. Daudon, and J Maroncle

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Silicon, Hydrogen, Physics::Instrumentation and Detectors, Detector, chemistry.chemical_element, Kinematics, Electron, chemistry, Physics::Accelerator Physics, Atomic physics, Instrumentation, Beam energy, Beam (structure)
Abstract

A beam energy measurement based on p(e,e’p) elastic scattering kinematics is presented. It uses two determinations in coincidences, symmetrically about the beam of the (e,e’p) kinematics. The scattered electron angles and the recoil proton angles are measured in silicon strip detectors. The goal is to determine the beam energy between 0.5 and 6 GeV with an accuracy of Δ E / E =10 −4 .

Published
1998
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22. First results in the application of silicon photomultiplier matrices to small animal PET

Author

C. De La Taille, J.F. Vagnucci, S. Bondil-Blin, V. Puill, Claudio Piemonte, V. Chaumat, Nicola Belcari, M. Melchiorri, Maurizio Boscardin, Pierre Barrillon, A. Del Guerra, Maria Giuseppina Bisogni, Alessandro Tarolli, N. Dinu, Nicola Zorzi, G. Collazuol, Gabriela Llosa, Sara Marcatili, Istituto Nazionale di Fisica Nucleare [Pisa] (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), P. Bourgeois, B. Cordier, H. El Mamouni, S. Kerhoas-Cavata, O. Limousin, P. Nédélec, and V. Puill and J.-C. Vanel

Subjects
Nuclear and High Energy Physics, medicine.medical_specialty, Fabrication, Photodetector, Substrate (electronics), Silicon photomultiplier, 01 natural sciences, Lyso, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Application-specific integrated circuit, Small animal, 0103 physical sciences, medicine, Medical physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Instrumentation, Physics, Pixel, 010308 nuclear & particles physics, business.industry, 87.57.uk, 42.74.Pw, 85.60.GZ, G-APD, Small animal PET, Optoelectronics, business
Abstract

A very high resolution small animal PET scanner that employs matrices of silicon photomultipliers as photodetectors is under development at the University of Pisa and INFN Pisa. The first SiPM matrices composed of 16 ( 4 × 4 ) 1 mm × 1 mm pixel elements on a common substrate have been produced at FBK-irst, and are being evaluated for this application. The MAROC2 ASIC developed at LAL-Orsay has been employed for the readout of the SiPM matrices. The devices have been tested with pixelated and continuous LYSO crystals. The results show the good performance of the matrices and lead to the fabrication of matrices with 64 SiPM elements.

Published
2009
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23. PMm2: large photomultipliers and innovative electronics for the next-generation neutrino experiments

Author

B. Genolini, A. Zghiche, W. Wei, L. Raux, C. Périnet, P. Rosier, T. Nguyen Trung, J. Tassan-Viol, Pierre Barrillon, R. Hermel, J. Favier, G. Martin-Chassard, F. Fouché, A.-G. Dehaine, B. Combettes, N. Dumont-Dayot, D. Duchesneau, J. Peyré, J. Pouthas, C. De La Taille, J.E. Campagne, F Dulucq, S. Conforti, S. Blin, E. Rindel, 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), Laboratoire de l'Accélérateur Linéaire (LAL), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), P. Bourgeois, B. Cordier, H. El Mamouni, S. Kerhoas-Cavata, O. Limousin, P. Nédélec, V. Puill and J.-C. Vanel, and PMm2

Subjects
Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, FOS: Physical sciences, Integrated circuit, Photodetection, Large photomultiplier tubes, 01 natural sciences, law.invention, Data acquisition, law, 0103 physical sciences, Neutrino, Electronics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 010306 general physics, Instrumentation, Physics, 010308 nuclear & particles physics, business.industry, Detector, Electrical engineering, High voltage, Front-end electronics, Proton decay, Instrumentation and Detectors (physics.ins-det), 3. Good health, Integrated electronics, business, Data transmission
Abstract

The next generation of proton decay and neutrino experiments, the post-SuperKamiokande detectors as those that will take place in megaton size water tanks, will require very large surfaces of photodetection and a large volume of data. Even with large hemispherical photomultiplier tubes, the expected number of channels should reach hundreds of thousands. A funded R&D program to implement a solution is presented here. The very large surface of photodetection is segmented in macro pixels made of 16 hemispherical (12 inches) photomultiplier tubes connected to an autonomous front-end which works on a triggerless data acquisition mode. The expected data transmission rate is 5 Mb/s per cable, which can be achieved with existing techniques. This architecture allows to reduce considerably the cost and facilitate the industrialization. This document presents the simulations and measurements which define the requirements for the photomultipliers and the electronics. A proto-type of front-end electronics was successfully tested with 16 photomultiplier tubes supplied by a single high voltage, validating the built-in gain adjustment and the calibration principle. The first tests and calculations on the photomultiplier glass led to the study of a new package optimized for a 10 bar pressure in order to sustain the high underwater pressure., 1 pdf file, 4 pages, 4 figures, NDIP08, submitted to Nucl. Instr. and Meth. Phys. Res. A

Published
2008
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24. ATLAS ALFA – Measuring absolute luminosity with scintillating fibres

Author

S. Franz, Pierre Barrillon, European Organization for Nuclear Research (CERN), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), P. Bourgeois, B. Cordier, H. El Mamouni, S. Kerhoas-Cavata, O. Limousin, P. Nédélec, V. Puill and J.-C. Vanel, and ATLAS

Subjects
Nuclear and High Energy Physics, Photomultiplier, Physics::Instrumentation and Detectors, Scintillator, 01 natural sciences, 7. Clean energy, Optics, Scintillating fibres, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 010306 general physics, Instrumentation, ComputingMilieux_MISCELLANEOUS, Physics, Large Hadron Collider, Luminosity (scattering theory), Interaction point, 010308 nuclear & particles physics, business.industry, Detector, Luminosity detector, 29.40.Mc, 85.60.Ha, 85.30.-z, DESY, Avalanche photodiode, Front end electronics, Optoelectronics, High Energy Physics::Experiment, business
Abstract

ALFA is a high-precision scintillating fibre tracking detector under construction for the absolute determination of the LHC luminosity at the ATLAS interaction point. This detector, mounted in so-called Roman Pots, will track protons elastically scattered under μrad angles at IP1.In total there are four pairs of vertically arranged detector modules which approach the LHC beam axis to mm distance. Each detector module consists of ten layers of two times 64 scintillating fibres each (U and V planes). The fibres are coupled to 64 channels Multi-Anodes PhotoMultipliers Tubes read out by compact front-end electronics. Each detector module is complemented by so-called overlap detectors: Three layers of two times 30 scintillating fibres which will be used to measure the relative positioning of two vertically arranged main detectors. The total number of channels is about 15000. Conventional plastic scintillator tiles are mounted in front of the fibre detectors and will serve as trigger counter. The extremely restricted space inside the pots makes the coupling to the read out devices very challenging. Several technologies have been tested in a beam at DESY and a cosmic-ray setup at CERN. A possible upgrade of the photo detection could consist in the replacement of the PMT by Geiger-mode avalanche photodiodes. Preliminary tests are being performed comparing the performance of these devices with the ones of the PMTs.

Published
2008
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25. Characterization of a prototype matrix of Silicon Photomultipliers (SiPMs)

Author

Nicola Zorzi, G. Collazuol, V. Chaumat, C. Bazin, S. Bondil-Blin, Alessandro Tarolli, J.F. Vagnucci, Pierre Barrillon, Gabriela Llosa, Maurizio Boscardin, N. Dinu, Maria Giuseppina Bisogni, Claudio Piemonte, A. Del Guerra, Sara Marcatili, Nicola Belcari, M. Melchiorri, C. De La Taille, V. Puill, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), P. Bourgeois, B. Cordier, H. El Mamouni, S. Kerhoas-Cavata, O. Limousin, P. Nédélec, and V. Puill and J.-C. Vanel

Subjects
Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Photodetector, 01 natural sciences, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, Matrix (mathematics), 0302 clinical medicine, Silicon photomultiplier, 0103 physical sciences, Breakdown voltage, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation, Silicon photo multipliers (SiPM), Physics, Quenching, 010308 nuclear & particles physics, business.industry, FBK-IRST, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Photodetection Efficiency, Wavelength, Optoelectronics, business, Dark current, Voltage
Abstract

This work reports on the electrical as well as the optical characterizations of a prototype matrix of Silicon PhotoMultipliers (SiPM). The electrical test consists of the measurement of the static (breakdown voltage, quenching resistance, post-breakdown dark current) as well as the dynamic characteristics (gain, dark count rate). The optical test consists of the estimation of the photon detection efficiency as a function of wavelength as well as operation voltage.

Published
2008
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26. Electro-optical characterization of SiPM: a comparative study

Author

G. Guilhem, N. Dinu, J.F. Vagnucci, C. Sylvia, V. Chaumat, C. Cheikali, C. Bazin, Z. Amara, V. Puill, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), P. Bourgeois, B. Cordier, H. El Mamouni, S. Kerhoas-Cavata, O. Limousin, P. Nédélec, and V. Puill and J.-C. Vanel

Subjects
010302 applied physics, Physics, Nuclear and High Energy Physics, Photon detection efficiency, 010308 nuclear & particles physics, business.industry, Photodetectors, Photodetector, 01 natural sciences, 7. Clean energy, Particle detector, Semiconductor detector, Silicon PhotoMultiplier, Silicon photomultiplier, Overvoltage, 0103 physical sciences, Measuring instrument, Dark count rate, Optoelectronics, Breakdown voltage, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Gain, business, Instrumentation, Voltage
Abstract

This work reports on the development of an electro-optical set-up for the characterization of the Silicon PhotoMultiplier (SiPM) devices as well as on the comparative study of the characteristics of different SiPM prototypes. The electrical set-up allows the measurement of the static (breakdown voltage, overvoltage quenching resistance) and dynamic (gain, dark count rate) characteristics. The optical set-up allows the estimation of the photon detection efficiency as a function of the wavelength and the operation voltage. The comparative study has been performed on SiPM devices covering an area of 1×1 mm2 and supplied during 2007 by Photonique S.A. (Switzerland), FBK-irst (Italy), SensL (Ireland) and Hamamatsu (Japan).

Published
2008
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