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14 results on '"Hourany E"'

1. Measurement of beam-recoil observables Ox , Oz and target asymmetry T for the reaction $ \gamma$ p → K+ $ \Lambda$

Author

Lleres, A., Bartalini, O., Bellini, V., Bocquet, J.P., Calvat, P., Capogni, M., Casano, L., Castoldi, M., D'Angelo, A., Didelez, J.-P., Di Salvo, R., Fantini, A., Franco, D., Gaulard, C., Gervino, G., Ghio, F., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kunne, R., Kuznetsov, Andrei, Lapik, A., Levi Sandri, P., Mammoliti, F., Mandaglio, G., Moricciani, D., Mushkarenkov, A.N., Nedorezov, V., Nicoletti, L., Perrin, C., Randieri, C., Rebreyend, D., Renard, F., Rudnev, N., Russew, T., Russo, G., Schaerf, C., Sperduto, M.-L., Sutera, M.-C., Turinge, A., Vegna, V., 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), 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), and GRAAL

Subjects
Nuclear and High Energy Physics, ENERGIES, media_common.quotation_subject, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], PROTON, K+, Lambda, 01 natural sciences, Asymmetry, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Recoil, 0103 physical sciences, SIGMA(0), Nuclear Experiment, 010306 general physics, media_common, Physics, 010308 nuclear & particles physics, Linear polarization, Observable, Polarization (waves), LAMBDA, BARYON RESONANCES, PHOTOPRODUCTION, Isobar, HYPERON, Physics::Accelerator Physics
Abstract

The double polarization (beam-recoil) observables Ox and Oz have been measured for the reaction gamma p -> K Lambda from threshold production to Egamma = 1500 MeV. The data were obtained with the linearly polarized beam of the GRAAL facility. Values for the target asymmetry T could also be extracted despite the use of an unpolarized target. Analyses of our results by two isobar models tend to confirm the necessity to include new or poorly known resonances in the 1900 MeV mass region., Comment: 19 pages, 15 figures, 3 tables

Published
2009
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2. BEAM ASYMMETRY IN MESON PHOTOPRODUCTION ON DEUTERON TARGETS AT GRAAL

Author

DI SALVO, R., Bartalini, O., Bellini, Vincenzo, Bocquet, J. P., Castoldi, M., D'Angelo, A., Didelez, J. P., Fantini, A., Gervino, G., Ghio, F., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kunne, R., Kuznetsov, V., Lapik, A., LEVI SANDRI, P., Lleres, A., Moricciani, D., Moushkarenko, A., Nedorezov, D. V., Rebreyend, D., Rudnev, N. V., Russo, Giuseppe, Schaerf, C., Sperduto, M. L., Sutera, CONCETTA MARIA, Turinge, A., and Zabrodin, A.

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, Meson, media_common.quotation_subject, Astronomy and Astrophysics, Asymmetry, Atomic and Molecular Physics, and Optics, Nuclear physics, Deuterium, Neutron, Beam (structure), media_common
Abstract

Preliminary results on the beam asymmetry Σ for η and π0 photoproduction on the proton and the neutron in the deuteron in a quasi free kinematics regime have been obtained. Very preliminary results will be presented on the status of art of the GRAAL search for the two members of the exotic penta-quarks anti-decuplet, the P11 and the Θ+.

Published
2005
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3. Recent results from the GRAAL and LEGS beams

Author

Bellini, V, Bocquet, Jp, Casano, L, Castoldi, M, D'Angelo, A, Didelez, Jp, Di Salvo, R, Fantini, A, Franco, D, Gervino, G, Ghio, F, Giardina, G, Girolami, B, Giusa, A, Guidal, M, Hourany, E, Kunne, R, Lapik, A, Sandri, Pl, Lleres, A, Mammoliti, F, Mandaglio, G, Manganaro, M, Moricciani, D, Mushkarenkov, A, Nedorezov, V, Nicoletti, L, Randieri, C, Rebreyend, D, Rudnev, N, Russo, G, Schaerf, C, Sperduto, Ml, Sutera, M, Turinge, A, Vegna, V, Ardashev, K, Bade, C, Blecher, M, Caracappa, A, Gibson, C, Gluckler, H, Hicks, K, Hoblit, S, Kageya, T, Khandaker, M, Kistner, Oc, Kizigul, S, Kucuker, S, Lehmann, A, Lincoln, F, Lindgren, R, Lowry, M, Lucas, M, Mahon, J, Miceli, L, Pap, M, Preedom, B, Sandorfi, Am, Seyfarth, H, Stroher, H, Thornl, Cf, Whisnant, Cs, Wang, K, and Wei, X

Subjects
Physics, Meson, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Compton scattering, Electron, Baryon, Nuclear physics, Physics::Accelerator Physics, ADONE, Nuclear Experiment, Nucleon, Beam (structure), Storage ring
Abstract

The polarized and tagged Graal gamma‐ray beam is obtained by backward Compton scattering of laser light on the high‐energy electrons circulating in the ESRF storage ring. This technique, first developed for the Ladon beam on the storage ring Adone at LNF [1], provides gamma‐ray beams with linear or circular polarizations close to one and well known. The Graal beam covers the energy region between 600 and 1500 MeV thus allowing the study of baryon resonances up to an energy of 1916 MeV, in large part by precision measurements of beam polarization asymmetries in meson photoproduction on the nucleons.

Published
2008

4. Eta photoproduction on the neutron at GRAAL : Measurement of the differential cross section

Author

Rebreyend, D., Bartalini, O., Bellini, V., Bocquet, J.P., Castoldi, M., D'Angelo, A., Didelez, J.-P., Di Salvo, R., Fantini, A., Gervino, G., Ghio, F., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kouznetsov, V., Kunne, R., Lapik, A., Levi Sandri, P., Lleres, A., Moricciani, D., Nedorezov, V., Russo, G., Rudnev, N., Schaerf, C., Sperduto, M.-L., Sutera, M.C., Turinge, A., 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), 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), and GRAAL

Subjects
Scattering cross-section, Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, FOS: Physical sciences, Astronomy and Astrophysics, respiratory system, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], PROTON, 01 natural sciences, Atomic and Molecular Physics, and Optics, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, 0103 physical sciences, cardiovascular system, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, circulatory and respiratory physiology
Abstract

In this contribution, we will present our first preliminary measurement of the differential cross section for the reaction gamma+n->eta+n. Comparison of the reactions gamma+p->eta+p for free and bound proton (D2 target) will also be discussed., 6 pages, 4 figures, Proceedings of the 10th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, August 29-September 4 2004, Beijing, China

Published
2004
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5. $\eta$ photoproduction off the neutron at GRAAL: Evidence for a resonant structure at W=1.67 GeV

Author

Kuznetsov, V., Bartalini, O., Bellini, V., Castoldi, M., D'Angelo, A., Didelez, J. -P., Di Salvo, R., Fantini, A., Franco, D., Gervino, G., Ghio, F., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kunne, R., Lapik, A., Sandri, P. Levi, Moricciani, D., Nicoletti, L., Randalieri, C., Rudnev, N., Russo, G., Schaerf, C., Sperduto, M. -L., Sutera, M. -C., Turinge, A., 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), J.P.Bocquet, V. Kuznetsov, and D. Rebreyend

Subjects
Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Structure (category theory), FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutron, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

New (preliminary) data on eta photoproduction off the neutron are presented. These data reveal a resonant structure at W=1.67 GeV., Comment: 8 pages, 4 figures. Published in Proceedings of Workshop on the Physics of Excited Nucleons NSTAR2004, Grenoble, France, March 24 - 27, pg.197

Published
2004

6. Photoexcitation of N* resonances

Author

D'Angelo, A, Bartalini, O, Bellini, V, Bocquet, J, Castoldi, M, Didelez, J, Di Salvo, R, Fantini, A, Gervino, G, Ghio, F, Girolami, B, Giusa, A, Guidal, M, Hourany, E, Kouznetsov, V, Kunne, R, Lapik, A, Sandi, P, Lleres, A, Moricciani, D, Nedorezov, V, Nicoletti, L, Randieri, C, Rebreyend, D, Renard, F, Rudnev, N, Schaerf, C, Sperduto, M, Sutera, C, Turinge, A, Zabrodin, A, and Zucchiatti, A

Subjects
Physics, Polarization observables, Resonance, PION-PHOTOPRODUCTION, Key issues, PROTON, SUM-RULE, Polarized target, THRESHOLD, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Photoexcitation, MODEL, ETA-PHOTOPRODUCTION, PHOTON, SIGMA BEAM ASYMMETRY, NUCLEON, Nuclear Experiment, Energy (signal processing)
Abstract

We present an overview of most recent experimental results of photonuclear reactions in the resonance energy region. High precision and polarization observables are the key issues in the study of N* resonance properties.

Published
2003

7. Differential cross section measurement of η photoproduction on the proton from threshold to 1100 MeV

Author

GRAAL collaboration, Renard, F., Anghinolfi, M., Bartalini, O., Bellini, V., Bocquet, J. -P., Capogni, M., Castoldi, M., Corvisiero, P., D'Angelo, A., Didelez, J. -P., Di Salvo, R., Gaulard, C., Gervino, G., Ghio, F., Girolami, B., Guidal, M., Hourany, E., Kouznetsov, V., Kunne, R., Lapik, A., Sandri, P. Levi, Lleres, A., Moricciani, D., Nedorezov, V., Nicoletti, L., Rebreyend, D., Rudnev, N., Sanzone, M., Schaerf, C., Sperduto, M. -L., Sutera, M. -C., Taiuti, M., Turinge, A., Zhao, Q., Zucchiatti, A., 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), 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), and GRAAL

Subjects
Scattering cross-section, Polarization observables, Particle physics, Nuclear and High Energy Physics, EXTRACTION, Photon, Proton, Baryon resonances, media_common.quotation_subject, Nuclear Theory, FOS: Physical sciences, PION-PHOTOPRODUCTION, 01 natural sciences, 7. Clean energy, Asymmetry, SIGMA-BEAM ASYMMETRY, DECAYS, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Eta photoproduction, 010306 general physics, Nuclear Experiment, media_common, Physics, BARYONS, 010308 nuclear & particles physics, Eta meson, Resonance, ELECTROPRODUCTION, RESONANCE, MODEL, Baryon, Differential cross section, Photon beam asymmetry, Particle Physics - Experiment, Beam (structure)
Abstract

The differential cross section for the reaction p(gamma, eta p) has been measured from threshold to 1100 MeV photon laboratory energy. For the first time, the region of the S11(1535) resonance is fully covered in a photoproduction experiment and allows a precise extraction of its parameters at the photon point. Above 1000 MeV, S-wave dominance vanishes while a P-wave contribution is observed whose nature will have to be clarified. These high precision data together with the already measured beam asymmetry data will provide stringent constraints on the extraction of new couplings of baryon resonances to the eta meson., 10 pages, 5 figures, submitted to Phys. Letters B. Typos corrected. Some more information on the S11(1535) parameters

Published
2002
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8. Meson photoproduction on the proton at GRAAL

Author

Boquet, Jp, Bartalini, O., Bellini, V., Castoldi, M., D’Angelo, A., Didelez, J. P., Di Salvo, R., Gervino, Gianpiero, Ghio, F., Girolami, B., Guidal, M., Hourany, E., Kouznetsov, V., Kunne, R., Lapik, A., Levi Sandri, P., Moricciani, D., Nedorezov, V., Nicoletti, M. L., Rebreyend, D., Renard, F., Rudnev, N., Sanzone, M., Schaerf, C., Sperduto, M. L., Sutera, M. C., Turinge, A., and Zucchiatti, A.

Subjects
Physics, Nuclear
Published
2001

9. Compton scattering at GRAAL

Author

Moricciani, D., Bartalini, O., Bellini, V., Bouquet, Jp, Capogni, M., Castoldi, M., D’Angelo, A., Didelez, J. P., Di Salvo, R., Fantini, A., Fichen, L., Gervino, Gianpiero, Girolami, B., Ghio, . F., Giusa, F., Guidal, M., Hourany, E., Kouznetsov, V., Lapik, A., Levi Sandri, P., Nedorezov, V., Nicoletti, Ml, Randieri, C., Rudnev, N., Russo, G., Schaerf, C., Sperduto, M. L., Sutera, M. C., Turinge, A., Zabrodin, A., and Zucchiatti, A.

Subjects
Physics, Nuclear
Published
2001

10. MESON PHOTOPRODUCTION ON THE NEUTRON AT GRAAL.

Author

Levi Sandri, P., Bellini, V., Bocquet, J. P., Casano, L., Castoldi, M., D'Angelo, A., Didelez, J.-P., Di Salvo, R., Fantini, A., Franco, D., Ghio, F., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kunne, R., Kuznetsov, V., Lapik, A., Lleres, A., and Moricciani, D.

Subjects
MESONS, NEUTRONS, DEUTERIUM, PROTONS, PHYSICS
Abstract

Using a Deuterium target, the GRAAL experiment has collected meson photoproduction data. The data have been analysed in the quasi free regime. The results of the quasi free process on the proton reproduce quite well the results previously obtained with a Hydrogen target. The preliminary results on the quasi free neutron for π0 and η photoproduction are presented and discussed. [ABSTRACT FROM AUTHOR]

Published
2007

11. ETA PHOTOPRODUCTION ON THE NEUTRON AT GRAAL: MEASUREMENT OF THE DIFFERENTIAL CROSS SECTION.

Author

Rebreyend, D., Bartalini, O., Bellini, V., Bocquet, J. P., Castoldi, M., D'Angelo, A., Didelez, J.-P., Di Salvo, R., Fantini, A., Gervino, G., Ghio, F., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kouznetsov, V., Kunne, A., Lapik, A., Levi Sandre, P., and Lleres, A.

Subjects
PHOTONS, EXCITON theory, LIGHT, PARTICLES (Nuclear physics), NUCLEAR physics, PHYSICS
Abstract

In this contribution, we will present our first preliminary measurement of the differential cross section for the reaction γn → ηn. Comparison of the reactions γ → ηp for free and bound proton (D2 target) will also be discussed. [ABSTRACT FROM AUTHOR]

Published
2005

12. New experimental and simulated results on nuclear media effects in meson photoproduction off nuclei

Author

Ignatov, A., Bartalini, O., Bellini, V., Bocquet, J.P., Calvat, P., Capogni, M., Casano, M., Castoldi, M., D’Angelo, A., Didelez, J.-P., Di Salvo, R., Fantini, A., Gervino, G., Ghio, F., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kouznetsov, V., and Kunne, R.

Subjects
*PARTICLES (Nuclear physics), *PHYSICS, *NUCLEAR energy, *ANALOG resonance
Abstract

Abstract: New experimental approach to study meson photoproduction in nuclei is discussed. It is based on the measurement of the recoil nucleon as a tagger for identification of the initial step of reaction. Propagation of mesons and nucleons within a nucleus is described by the Intra-Nuclear Cascade (INC) model. Simulations and preliminary experimental data for the deuteron target obtained at GRAAL are presented. [Copyright &y& Elsevier]

Published
2008
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