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12 results on '"Y. Perrin"'

1. A Radial Time Projection Chamber for $\alpha$ detection in CLAS at JLab

Author

S. Minutoli, A. El Alaoui, Paolo Musico, S. E. Kuhn, M. Battaglieri, B. Torayev, R. De Vita, R. Dupre, K. Hafidi, S. Stepanyan, S. Bueltmann, N. A. Baltzell, Y. Perrin, E. Voutier, A. Celentano, Katya Kosheleva, M. Hattawy, M. Oliver, L. El Fassi, H. C. Fenker, 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), 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), 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)-Université Grenoble Alpes (UGA), 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 ), 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 ) -Université Grenoble Alpes ( UGA )

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Meson production, Physics - Instrumentation and Detectors, Nuclear Theory, Measure (physics), Nuclear physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, time projection chamber: design, 010305 fluids & plasmas, Gas electron multipliers, High Energy Physics - Experiment, helium: nucleus, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], CLAS, 0103 physical sciences, Calibration, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], meson: production, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation, Alpha particles, nucleus: recoil, Physics, deeply virtual Compton scattering: coherence, Time projection chamber, Spectrometer, Compton scattering, Alpha particle, calibration, sensitivity, DVCS, performance
Abstract

A new Radial Time Projection Chamber (RTPC) was developed at the Jefferson Laboratory to track low-energy nuclear recoils for the purpose of measuring exclusive nuclear reactions, such as coherent Deeply Virtual Compton Scattering and coherent meson production off $^4$He. In such processes, the $^4$He nucleus remains intact in the final state, however the CEBAF Large Acceptance Spectrometer (CLAS) cannot track the low energy $\alpha$ particles. In 2009, we carried out measurements using the CLAS spectrometer supplemented by the RTPC positioned directly around a gaseous $^4$He target, allowing a detection threshold as low as 12$\sim$MeV for $^4$He. This article discusses the design, principle of operation, calibration methods and the performances of this RTPC.

Published
2017

2. Differential cross section of γn→K+Σ− on bound neutrons with incident photons from 1.1 to 3.6 GeV

Author

A. I. Ostrovidov, K. Park, M. E. McCracken, D. G. Ireland, Michael Dugger, Volker D. Burkert, A. S. Biselli, V. P. Kubarovsky, Lorenzo Zana, Sergey Kuleshov, H. S. Jo, C. Salgado, K. A. Griffioen, O. Pogorelko, D. Protopopescu, L. Guo, P. Nadel-Turonski, S. Fegan, R. De Vita, M. Osipenko, S. S. Stepanyan, S. Pozdniakov, W. Gohn, S. Procureur, C. Bookwalter, S. Anefalos Pereira, K. Mikhailov, F. Sabatié, M. Guidal, S. Dhamija, V. Crede, N. Dashyan, W. J. Briscoe, E. Pasyuk, Y. Perrin, T. Mineeva, R. W. Gothe, E. De Sanctis, S. L. Careccia, R. Dupre, M. Holtrop, A. Daniel, Gerard Gilfoyle, G. Ricco, M. Aghasyan, P. Eugenio, M. Battaglieri, J. Salamanca, Friedrich Klein, Brian Raue, K. Joo, D. Sokhan, E. Munevar, D. I. Sober, S. Pisano, B. S. Ishkhanov, B. Morrison, G. Gavalian, S. Tkachenko, W. Kim, B. Zhao, H. Baghdasaryan, M. Ripani, P. L. Cole, B. McKinnon, C. Djalali, G. Niculescu, A. El Alaoui, F. X. Girod, Y. Ilieva, K. L. Giovanetti, Michael Wood, D. Branford, P. Collins, D. Keller, M. Mirazita, E. Voutier, P. Khetarpal, G. Rosner, B. L. Berman, A. D'Angelo, S. S. Jawalkar, I. Niculescu, J. P. Ball, Y. Prok, M. Khandaker, C. Hanretty, D. S. Carman, J. W. Price, N. Hassall, R. A. Schumacher, S. Park, V. Mokeev, P. Rossi, T. A. Forest, S. Stepanyan, H. Moutarde, S. Strauch, P. Stoler, D. P. Watts, B. Dey, B. Moreno, K. Hicks, B. Vernarsky, K. Livingston, J. Zhang, R. Dickson, N. Guler, M. Y. Gabrielyan, H. Hakobyan, D. J. Tedeschi, V. Kuznetsov, S. Niccolai, E. Seder, M. Anghinolfi, H. Seraydaryan, Y. G. Sharabian, Martin K. Mayer, M. S. Saini, Barry Ritchie, J. T. Goetz, I. I. Strakovsky, A. Deur, W. K. Brooks, Kei Moriya, C. A. Meyer, K. P. Adhikari, Michael Vineyard, D. P. Weygand, and D. Doughty

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Meson, 010308 nuclear & particles physics, Hadron, Photon energy, Strangeness, 7. Clean energy, 01 natural sciences, Nuclear physics, Baryon, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Differential cross sections of the reaction γd → K+Σ–(p) have been measured with the CLAS detector at Jefferson Lab using incident photons with energies between 1.1 and 3.6 GeV. This is the first complete set of strangeness photoproduction data on the neutron covering a broad angular range. At energies close to threshold and up to Eγ ~ 1.8 GeV, the shape of the angular distribution is suggestive of the presence of s -channel production mechanisms. For Eγ > 1.8 GeV, a clear forward peak appears and becomes more prominent as the photon energy increases, suggesting contributions from t-channel production mechanisms. Furthermore, these data can be used to constrain future analysis of this reaction.

Published
2010

3. Coherent photoproduction ofπ+fromHe3

Author

C. E. Hyde, H. Moutarde, K. L. Giovanetti, Larry Weinstein, William Brooks, P. Khetarpal, B. McKinnon, C. Djalali, E. S. Smith, B. Guegan, G. Rosner, K. A. Griffioen, S. Fegan, Barry Ritchie, W. J. Briscoe, E. Pasyuk, B. L. Berman, S. Park, R. W. Gothe, Y. Perrin, H. Y. Lu, D. Branford, Frank Klein, W. Gohn, Sergey Kuleshov, M. Mirazita, F. X. Girod, Dustin Keller, N. Dashyan, J. McAndrew, P. L. Cole, Z. W. Zhao, George Davey Smith, I. Niculescu, P. Collins, D. G. Ireland, V. Crede, K. Hafidi, A. Deur, Yordanka Ilieva, W. Tang, M. Taiuti, S. Strauch, C. E. Taylor, A. D'Angelo, R. A. Schumacher, M. Osipenko, B. Morrison, D. P. Weygand, L. Casey, V. Batourine, L. Graham, D. Adikaram, L. El Fassi, P. Stoler, G. Niculescu, I. J. D. MacGregor, V. P. Kubarovsky, A. M. Micherdzinska, F. Sabatié, B. Zhao, M. Holtrop, J. P. Ball, R. Dupre, M. Battaglieri, B. Dey, S. Stepanyan, A. Daniel, D. S. Carman, C. Hanretty, Diane Schott, E. Voutier, R. Suleiman, A. Kim, D. J. Tedeschi, A. I. Ostrovidov, I. Bedlinskiy, P. Konczykowski, Andreas Klein, S. Procureur, D. P. Watts, V. Kuznetsov, H. Egiyan, K. Park, E. Munevar, Pawel Nadel-Turonski, S. Niccolai, Rakhsha Nasseripour, M. H. Wood, R. Paremuzyan, A. Ni, Gerard Gilfoyle, Volker D. Burkert, A. S. Biselli, D. Sokhan, A. El Alaoui, B. Vernarsky, B. Moreno, K. Livingston, R. Dickson, A. Fradi, S. Pisano, D. Protopopescu, S. Pozdniakov, Nicholas Kvaltine, D. Doughty, D. Heddle, M. Khandaker, M. Gabrielyan, M. Anghinolfi, H. Seraydaryan, S. Tkachenko, Y. G. Sharabian, M. Ripani, Carlos A. Salgado, Paolo Rossi, Martin K. Mayer, Michael Paolone, M. S. Saini, J. T. Goetz, S. E. Kuhn, E. De Sanctis, D. I. Sober, R. De Vita, S. Anefalos Pereira, M. Ungaro, S. S. Stepanyan, J. W. Price, K. P. Adhikari, H. Hakobyan, K. Moriya, E. L. Isupov, Michael Vineyard, and W. Kim

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2011

4. Differential cross section and recoil polarization measurements for theγp→K+Λreaction using CLAS at Jefferson Lab

Author

P. Eugenio, R. De Vita, S. Anefalos Pereira, M. Taiuti, E. Munevar, E. De Sanctis, M. Ungaro, D. I. Sober, W. Kim, Kei Moriya, D. Doughty, C. A. Meyer, S. S. Stepanyan, B. P. Quinn, S. Pisano, Y. Perrin, F. X. Girod, G. Niculescu, Martin K. Mayer, B. McKinnon, D. Protopopescu, S. Fegan, S. Strauch, J. Salamanca, S. Procureur, S. Pozdniakov, H. Hakobyanm, Friedrich Klein, P. Collins, I. Niculescu, D. P. Watts, Brian Raue, K. P. Adhikari, D. J. Tedeschi, D. P. Weygand, B. Morrison, V. P. Kubarovsky, V. Crede, T. Mineeva, D. Branford, M. Bellis, F. Sabatié, M. S. Saini, O. Pogorelko, D. Schott, R. A. Schumacher, M. Mirazita, A. El Alaoui, Y. Ilieva, J. W. Price, P. Khetarpal, P. Nadel-Turonski, H. Moutarde, A. Fradi, J. P. Ball, Y. Prok, B. Vernarsky, Michael Dugger, S. Dhamija, D. S. Carman, M. Y. Gabrielyan, N. Hassall, C. Hanretty, A. I. Ostrovidov, K. Park, S. L. Careccia, R. W. Gothe, Sergey Kuleshov, V. Kuznetsov, J. T. Goetz, H. S. Jo, E. Seder, A. D'Angelo, D. G. Ireland, W. J. Briscoe, E. Pasyuk, K. L. Giovanetti, S. Niccolai, B. Moreno, K. Livingston, M. Guidal, Larry Weinstein, C. Djalali, Volker D. Burkert, M. Battaglieri, A. S. Biselli, N. Dashyan, R. Dickson, D. Keller, K. A. Griffioen, B. L. Berman, G. Rosner, J. McAndrew, E. Voutier, Avraham Klein, Michael Wood, M. Holtrop, Barry Ritchie, A. Daniel, K. Hafidi, M. Khandaker, S. Park, G. Ricco, S. Tkachenko, D. Sokhan, P. Rossi, M. Ripani, M. Osipenko, M. E. McCracken, M. F. Vineyard, M. Anghinolfi, H. Seraydaryan, Y. G. Sharabian, V. Mokeev, P. L. Cole, P. Stoler, B. Dey, A. Deur, W. K. Brooks, K. Hicks, W. Gohn, Lorenzo Zana, M. D. Mestayer, Michael L. Williams, and R. Dupre

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Lambda baryon, Lambda, 7. Clean energy, 01 natural sciences, Baryon, Nuclear physics, Pion, Recoil, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

We present measurements of the differential cross section and Lambda recoil polarization for the gamma p to K+ Lambda reaction made using the CLAS detector at Jefferson Lab. These measurements cover the center-of-mass energy range from 1.62 to 2.84 GeV and a wide range of center-of-mass K+ production angles. Independent analyses were performed using the K+ p pi- and K+ p (missing pi -) final-state topologies; results from these analyses were found to exhibit good agreement. These differential cross section measurements show excellent agreement with previous CLAS and LEPS results and offer increased precision and a 300 MeV increase in energy coverage. The recoil polarization data agree well with previous results and offer a large increase in precision and a 500 MeV extension in energy range. The increased center-of-mass energy range that these data represent will allow for independent study of non-resonant K+ Lambda photoproduction mechanisms at all production angles.

Published
2010

5. Partial wave analysis of the reactionγp→pωand the search for nucleon resonances

Author

Martin K. Mayer, S. Dhamija, R. W. Gothe, M. S. Saini, D. Keller, V. Mokeev, J. Zhang, Michael Vineyard, B. Zhao, M. Guidal, G. E. Dodge, H. Y. Lu, B. L. Berman, S. S. Jawalkar, M. Mirazita, S. Tkachenko, S. Park, M. Khandaker, K. A. Griffioen, M. Holtrop, Elton Smith, A. Daniel, P. Eugenio, M. Taiuti, V. Kuznetsov, K. Livingston, C. Hanretty, M. Anghinolfi, I. Niculescu, R. A. Niyazov, H. Seraydaryan, D. Applegate, J. Salamanca, Y. G. Sharabian, Friedrich Klein, V. Crede, S. L. Careccia, P. L. Cole, J. R. Johnstone, Paolo Rossi, M. Osipenko, B. Morrison, R. Dickson, P. Stoler, E. Munevar, B. S. Ishkhanov, S. S. Stepanyan, A. D'Angelo, P. Collins, Barry Ritchie, B. Dey, S. Procureur, P. Nadel-Turonski, D. Schott, K. L. Giovanetti, L. Guo, M. Ungaro, F. X. Girod, E. L. Isupov, Michael L. Williams, Mark W. Paris, K. Hicks, Marco Ripani, F. Sabatié, Latifa Elouadrhiri, W. Kim, D. Doughty, J. P. Ball, Kei Moriya, C. A. Meyer, G. Niculescu, S. Niccolai, G. V. Fedotov, M. R. Niroula, Y. Perrin, Michael Dugger, M. Bellis, Giovanni Ricco, N. Guler, P. Khetarpal, K. P. Adhikari, S. Strauch, D. S. Carman, D. P. Weygand, J. W. Price, C. S. Nepali, K. Joo, D. P. Watts, H. Hakobyan, N. Hassall, M. E. McCracken, Sergey Kuleshov, C. Djalali, D. J. Tedeschi, H. S. Jo, R. A. Schumacher, M. Y. Gabrielyan, R. Dupre, M. Battaglieri, I. Bedlinskiy, E. Voutier, C. Salgado, D. Protopopescu, S. Pozdniakov, M. Garçon, G. Rosner, W. J. Briscoe, E. Pasyuk, Avraham Klein, Y. Ilieva, V. P. Kubarovsky, R. De Vita, O. Pogorelko, A. El Alaoui, B. Moreno, J. McAndrew, Michael Wood, K. Hafidi, S. Anefalos Pereira, E. De Sanctis, H. Baghdasaryan, D. I. Sober, S. Fegan, A. Fradi, S. Pisano, A. I. Ostrovidov, K. Park, D. G. Ireland, Volker D. Burkert, A. S. Biselli, Z. Krahn, B. McKinnon, Gerard Gilfoyle, D. Sokhan, E. Golovatch, W. Gohn, I. I. Strakovsky, A. Deur, and W. K. Brooks

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Omega baryon, 01 natural sciences, Omega, Baryon, Pion, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon
Abstract

An event-based partial wave analysis (PWA) of the reaction {gamma}p{yields}p{omega} has been performed on a high-statistics dataset obtained using the CLAS at Jefferson Lab for center-of-mass energies from threshold up to 2.4 GeV. This analysis benefits from access to the world's first high-precision spin-density matrix element measurements, available to the event-based PWA through the decay distribution of {omega}{yields}{pi}{sup +}{pi}{sup -}{pi}{sup 0}. The data confirm the dominance of the t-channel {pi}{sup 0} exchange amplitude in the forward direction. The dominant resonance contributions are consistent with the previously identified states F{sub 15}(1680) and D{sub 13}(1700) near threshold, as well as the G{sub 17}(2190) at higher energies. Suggestive evidence for the presence of a J{sup P}=5/2{sup +} state around 2 GeV, a ''missing'' state, has also been found. Evidence for other states is inconclusive.

Published
2009

6. Differential cross sections and spin density matrix elements for the reactionγp→pω

Author

V. Crede, Gerard Gilfoyle, K. Park, H. Hakobyan, D. Sokhan, S. S. Stepanyan, D. J. Tedeschi, B. McKinnon, I. Bedlinskiy, Barry Ritchie, Y. Perrin, W. Gohn, V. Kuznetsov, S. Niccolai, C. Djalali, M. Mirazita, S. Fegan, N. Gevorgyan, C. Bookwalter, S. Strauch, D. Applegate, S. L. Careccia, P. Nadel-Turonski, I. I. Strakovsky, A. Deur, M. Guidal, M. Holtrop, F. Sabatié, Y. Ilieva, E. Voutier, S. Procureur, Michael Dugger, K. A. Griffioen, W. K. Brooks, A. Daniel, K. L. Giovanetti, Latifa Elouadrhiri, Kei Moriya, C. A. Meyer, E. De Sanctis, Larry Weinstein, S. Park, G. V. Fedotov, D. Doughty, H. S. Jo, Z. Krahn, E. Golovatch, D. I. Sober, G. Ricco, B. L. Berman, K. P. Adhikari, B. Zhao, D. P. Weygand, H. Baghdasaryan, P. Rossi, A. I. Ostrovidov, C. Salgado, Sergey Kuleshov, F. X. Girod, J. Salamanca, D. G. Ireland, B. Moreno, M. Y. Gabrielyan, S. S. Jawalkar, K. Livingston, Volker D. Burkert, B. Morrison, Elton Smith, A. S. Biselli, R. Dickson, J. P. Ball, D. S. Carman, P. Eugenio, Friedrich Klein, M. Anghinolfi, M. Taiuti, N. Hassall, M. Bellis, Brian Raue, J. W. Price, H. Seraydaryan, A. Fradi, D. Keller, S. Dhamija, S. Tkachenko, Y. G. Sharabian, R. W. Gothe, P. Collins, M. Ripani, S. Pisano, E. Munevar, M. Khandaker, Martin K. Mayer, B. S. Ishkhanov, M. S. Saini, R. Dupre, M. Battaglieri, D. Protopopescu, R. De Vita, S. Pozdniakov, M. Garçon, M. R. Niroula, Michael Vineyard, M. Paris, R. A. Schumacher, S. Anefalos Pereira, E. L. Isupov, Avraham Klein, Michael L. Williams, G. E. Dodge, H. Y. Lu, H. Moutarde, I. Niculescu, R. A. Niyazov, D. Schott, L. Guo, D. P. Watts, M. Ungaro, K. Joo, J. Zhang, C. Hanretty, J. R. Johnstone, V. P. Kubarovsky, O. Pogorelko, W. J. Briscoe, E. Pasyuk, G. Rosner, A. El Alaoui, J. McAndrew, Michael Wood, K. Hafidi, P. Stoler, A. D'Angelo, B. Dey, M. E. McCracken, K. Hicks, K. Mikhailov, W. Kim, P. L. Cole, G. Niculescu, P. Khetarpal, C. S. Nepali, V. Mokeev, and M. Osipenko

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Elementary particle, Omega baryon, 01 natural sciences, Omega, Nuclear physics, Baryon, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Energy (signal processing)
Abstract

High-statistics differential cross sections and spin-density matrix elements for the reaction {gamma}p{yields}p{omega} have been measured using the CEBAF large acceptance spectrometer (CLAS) at Jefferson Lab for center-of-mass (c.m.) energies from threshold up to 2.84 GeV. Results are reported in 112 10-MeV wide c.m. energy bins, each subdivided into cos{theta}{sub c.m.}{sup {omega}} bins of width 0.1. These are the most precise and extensive {omega} photoproduction measurements to date. A number of prominent structures are clearly present in the data. Many of these have not previously been observed due to limited statistics in earlier measurements.

Published
2009

7. Differential cross sections for the reactionsγp→pηandγp→pη'

Author

G. E. Dodge, H. Y. Lu, J. Salamanca, R. De Vita, B. Morrison, E. Munevar, A. I. Ostrovidov, K. Park, B. S. Ishkhanov, I. Niculescu, R. A. Niyazov, G. Rosner, D. Applegate, D. G. Ireland, Volker D. Burkert, V. Kuznetsov, S. Anefalos Pereira, D. Schott, A. S. Biselli, D. Keller, Z. Krahn, Michael Vineyard, F. X. Girod, W. Kim, P. L. Cole, M. R. Niroula, G. Niculescu, J. McAndrew, N. Hassall, M. Bellis, V. Crede, M. Guidal, C. Djalali, Michael Wood, K. Hafidi, M. Khandaker, K. Mikhailov, M. E. McCracken, P. Khetarpal, A. Fradi, S. Niccolai, C. S. Nepali, S. Strauch, M. Holtrop, Gerard Gilfoyle, J. W. Price, F. Sabatié, E. De Sanctis, D. Sokhan, D. P. Watts, V. P. Kubarovsky, D. Doughty, I. I. Strakovsky, D. I. Sober, H. Hakobyan, A. Deur, O. Pogorelko, P. Stoler, H. S. Jo, Barry Ritchie, A. Daniel, A. D'Angelo, J. Zhang, B. Dey, P. Nadel-Turonski, C. Salgado, B. McKinnon, W. K. Brooks, S. Pisano, R. A. Schumacher, K. Hicks, L. Guo, M. Ungaro, Y. Perrin, M. Osipenko, D. J. Tedeschi, P. Eugenio, M. Y. Gabrielyan, W. J. Briscoe, E. Pasyuk, M. Mirazita, M. Taiuti, B. L. Berman, K. A. Griffioen, G. Ricco, E. Golovatch, I. Bedlinskiy, S. Park, S. L. Careccia, K. Livingston, Sergey Kuleshov, K. Joo, R. Dickson, P. Rossi, K. L. Giovanetti, Larry Weinstein, Avraham Klein, P. Collins, N. Guler, Friedrich Klein, D. Pieschacon, T. Mineeva, Brian Raue, W. Gohn, S. S. Stepanyan, V. Mokeev, S. Dhamija, Latifa Elouadrhiri, Kei Moriya, C. Hanretty, A. El Alaoui, C. A. Meyer, Y. Ilieva, R. W. Gothe, J. R. Johnstone, R. Dupre, M. Battaglieri, K. P. Adhikari, D. P. Weygand, E. L. Isupov, Michael L. Williams, B. Zhao, D. Protopopescu, S. Pozdniakov, M. Garçon, S. S. Jawalkar, S. Procureur, J. P. Ball, Y. Prok, D. S. Carman, E. Voutier, H. Baghdasaryan, S. Fegan, C. Bookwalter, Michael Dugger, S. Tkachenko, M. Ripani, Elton Smith, M. Anghinolfi, H. Seraydaryan, Y. G. Sharabian, Martin K. Mayer, and M. S. Saini

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Elementary particle, 7. Clean energy, 01 natural sciences, Baryon, Nuclear physics, Isospin, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Boson
Abstract

High-statistics differential cross sections for the reactions gamma p -> p eta and gamma p -> p eta-prime have been measured using the CLAS at Jefferson Lab for center-of-mass energies from near threshold up to 2.84 GeV. The eta-prime results are the most precise to date and provide the largest energy and angular coverage. The eta measurements extend the energy range of the world's large-angle results by approximately 300 MeV. These new data, in particular the eta-prime measurements, are likely to help constrain the analyses being performed to search for new baryon resonance states.

Published
2009

8. Rejuvenation of a data acquisition system for fixed target experiments in a large multiuser spectrometer at CERN

Author

W. Bozzoli, H. Matthews, Y. Perrin, P. Vande Vyvre, F. Bourgeois, M. Weymann, Federico Antinori, J.-P. Dufey, and E. Lamanna

Subjects
Nuclear and High Energy Physics, Engineering, Large Hadron Collider, Spectrometer, business.industry, Data acquisition, Nuclear Energy and Engineering, Nuclear electronics, Electronic engineering, Detectors and Experimental Techniques, Electrical and Electronic Engineering, business, Throughput (business), Host (network), Computer hardware, Computer Automated Measurement and Control, VMEbus
Abstract

The new multiuser data acquisition system in operation at the CERN Omega spectrometer since July 1989 is described. Data are buffered from CAMAC, Fastbus, or VME front-ends during the beam spill while processing and event building take place off-spill under the control of standard processors in VME. The host is a VAX 6310, and data are stored on 3480-compatible cartridges. Standard software packages are used throughout, and the maximum throughput is about 1 MB/s (13 MB of data per spill). >

Published
1990

9. Some Further Results in Nuclear Scattering Radiography

Author

J. Saudinos, J Vinciarelli, Georges Charpak, David W. Townsend, L. Dubal, S. Majewski, Fabio Sauli, and Y. Perrin

Subjects
Physics, Nuclear scattering, Nuclear and High Energy Physics, Human head, business.industry, Scattering, Radiography, Resolution (electron density), Particle detector, Nuclear physics, Optics, Nuclear Energy and Engineering, Electrical and Electronic Engineering, business, Intensity (heat transfer), Beam (structure)
Abstract

The work has shown that nuclear scattering radiography (NSR), is capable of a three-dimensional measurement of density distributions with a volume resolution of about 2 mm$sup 3$ in objects of a size similar to that of a human head. Hydrogen radiographies are possible in addition to radiographies sensitive to density or atomic distribution. It is planned to make experiments under conditions of beam intensity and data rates compatible with full use of the potential advantages of the method for radiographies of living bodies.

Published
1976

10. Progress in Nuclear Scattering Radiography

Author

J.C. Duchazeaubeneix, G. Salamon, Georges Charpak, M. Leopold, Y. Perrin, J. Saudinos, G. Melchart, G. Odyniec, C. Raybaud, B. Guillerminet, M. Rouget, J. C. Faivre, Fabio Sauli, and D. Garreta

Subjects
Physics, Nuclear scattering, Nuclear and High Energy Physics, Human head, Image quality, business.industry, Radiography, Iterative reconstruction, Charged particle, Vertex (geometry), Optics, Nuclear Energy and Engineering, Tomography, Electrical and Electronic Engineering, business
Abstract

using conventional techniques of high energy physics, density distributions inside thick bodies can be mapped reconstructing the interaction vertex of charged particles in the GeV region. As compared to X-ray computer assisted tomography, nuclear scattering radiography offers the advantages of being fully three-dimensional and of reducing the overall radiation dose for a comparable image quality; furthermore, a subset of the data that corresponds to elastic interactions allows to measure the hydrogen density distribution in the object which is a unique feature of this method. Preliminary results obtained on a preserved human head are here presented.

Published
1979

11. The integration of VAX and VALET-plus data acquisition software

Author

Y. Perrin, J. Petersen, Roberto Divia, B W Wessels, Roberto Bagnara, W. Carena, L. Tremblet, G. Heyes, C Parkman, and T.J. Berners-Lee

Subjects
Nuclear and High Energy Physics, ComputerSystemsOrganization_COMPUTERSYSTEMIMPLEMENTATION, business.industry, Computer science, Suite, Modular design, computer.software_genre, Data flow diagram, Software, Data acquisition, Nuclear Energy and Engineering, Computer engineering, Microcode, Operating system, Electrical and Electronic Engineering, User interface, business, computer, VMEbus
Abstract

The VALET-plus is a CERN-developed modular microcomputer system that is based on the Motorola 68K family of microprocessors in a VME environment and has had wide success as a stand-alone test and data-acquisition system. Recently, several experiments at CERN have started to use multiple VALET-plus systems controlled from VAXes or VAXstations. These are used as stand-alone systems in the early phases of the experiment and are later integrated into the final readout and online system. Facilities developed to allow the integration of such VALET-plus systems with the CERN VAX online environment, and in particular with MODEL (a suite of modular data-acquisition software packages for VAXes), are described. This has involved adapting VALET-plus software to the embedded environment, and extending MODEL services to include data flow between VALET-plus and VAX, control of VALET-plus from the VAX, error reporting, and human-interface facilities. >

Published
1989

12. The VALET-Plus, a VMEbus based microcomputer for physics applications

Author

Y. Perrin, L. Tremblet, Tim Berners-Lee, J. Petersen, and Christopher Parkman

Subjects
Nuclear and High Energy Physics, business.industry, System testing, Modular design, Application software, computer.software_genre, Data acquisition, Nuclear Energy and Engineering, Computer engineering, Microcomputer, Control system, Operating system, Electronics, Electrical and Electronic Engineering, Detectors and Experimental Techniques, business, computer, VMEbus
Abstract

The VALET-Plus is a modular VMEbus based microcomputer system developed at CERN for use in applications such as the development and testing of electronics, equipment control and data acquisition. First released in 1985, more than 100 VALET-Plus systems are used today in 14 countries. The system will be described with particular emphasis on the SPIDER data acquisition package which offers both real time programming, using an interactive language, and fast data collection at rates of more than 1000 formatted events per second.

Published
1987

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