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16 results on '"Hourany E"'

1. Simultaneous Photoproduction of eta and pi0 Mesons on the Proton

Author

Ajaka, J., Assafiri, Y., Bartalini, O., Bellini, Vincenzo, Bouchigny, S., Castoldi, M., D'Angelo, A., Didelez, J. P., DI SALVO, R., Doring, M., Fantini, A., Fichen, L., Gervino, G., Ghio, F., Girolami, B., Giusa, A, Guidal, M., Hourany, E., Kunne, R., Lapik, A., LEVI SANDRI, P., Moricciani, D., Mushkarenkov, A., Nedorezov, V., Oset, E., Randieri, C., Rudnev, N., Russo, Giuseppe, Schaerf, C., Sperduto, M., Sutera, CONCETTA MARIA, and Turinge, A.

Subjects
interaction [photon p], Beam energy, Resonance, (1)) [< 1.5 GeV], Settore FIS/04 - Fisica Nucleare e Subnucleare, energy dependence, Grenoble ESRF [interpretation of experiments], Photochemical reactions, ddc:550, Chirality, Protons, Beam asymmetry, Mesons, Photoproduction, Bosons, Nuclear Experiment, numerical calculations, associated production [pi0], photoproduction [eta], cross section, N(1535), polarized beam [photon], +p+eta+pi0%22">photon p --> p eta pi0, intermediate boson [nucleon resonance], Delta(1700), asymmetry [polarization], High Energy Physics::Experiment, chiral [effective Lagrangian]
Abstract

The analysis of the gamma p ->eta pi(0)p reaction has been performed using data from the GRAAL experiment. The total and differential cross sections and the beam asymmetry have been obtained from threshold up to 1.5 GeV of beam energy. The two resonances S-11(1535) and Delta(1700) are expected to be excited in the intermediate states of this reaction. The results are used to test predictions based on the assumption that both resonances are dynamically generated from the meson-baryon interaction provided by chiral Lagrangians. The term involving the Delta(1700) excitation, followed by the decay into eta Delta(1232), is found to be dominant.

Published
2008
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2. GENERALIZED PARTON DISTRIBUTIONS AND NUCLEON RESONANCES.

Author

GUIDAL, M., BOUCHIGNY, S., DIDELEZ, J.-P., HADJIDAKIS, C., HOURANY, E., and VANDERHAEGHEN, M.

Subjects
PARTICLES (Nuclear physics), QUANTUM chromodynamics, PARTONS, PROTONS, NUCLEON-nucleon scattering
Published
2003

3. COMPTON SCATTERING AT GRAAL.

Author

BARTALINI, O., BELLINI, V., BOCQUET, J. P., CAPOGNI, M., CASTOLDI, M., D'ANGELO, A., D'ANGELO, ANNELISA, DIDELEZ, J. P., DI SALVO, R., FANTINI, A., GERVINO, G., GHIO, F., GIROLAMI, B., GUIDAL, M., HOURANY, E., KILVINGTON, I., KUNNE, R., KUZNETSOV, V., LAPIK, A., and SANDRI, P. LEVI

Subjects
COMPTON scattering, POLARIZATION (Nuclear physics), PROTONS, PHOTON scattering, ELECTRONS
Published
2003

4. OMEGA PHOTOPRODUCTION AT GRAAL.

Author

BARTALINI, O., BELLINI, V., BOCQUET, J. P., CASTOLDI, M., D'ANGELO, ANNALISA, d'ANGELO, ANNELISA, 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., SANDRI, P. LEVI, and LLERES, A.

Subjects
COMPTON scattering, PHOTON beams, POLARIZATION (Nuclear physics), PROTONS, HADRONS
Published
2003

5. GDH AT GRAAL WITH POLARIZED HD TARGET.

Author

BOUCHIGNY, S., COMMEAUX, C., DIDELEZ, J.-P., GUIDAL, M., HOURANY, E., KUNNE, R., ROUILLE, G., BASSAN, M., D'ANGELO, A., DI SALVO, R., FANTINI, A., MORICCIANI, D., SCHAERF, C., BOCQUET, J.-P., LLERES, A., REBREYEND, D., KUZNETSOV, V., LAPIK, A., NEDOREZOV, V., and ROUDNEV, N. V.

Subjects
POLARIZATION (Nuclear physics), PROTONS, NEUTRONS, DEUTERONS, PHOTON beams
Published
2003

6. Meson photoproduction on the proton at GRAAL.

Author

Bocquet, J.-P., Bartalini, O., Bellini, V., Castoldi, M., Corvisiero, P., D’Angelo, A., Didelez, J.-P., Di Salvo, R., Gervino, G., Ghio, F., Girolami, B., Guidal, M., Hourany, E., Kouznetsov, V., Kunne, R., Lapik, A., Sandri, P. Levi, Lleres, A., Moricciani, D., and Nedorozov, V.

Subjects
MESONS, PROTONS, LIGHT scattering, ELECTRON beams
Abstract

The GRAAL (Grenoble Anneau Acc&ecute;lérateur Laser) facility provides a polarized and tagged photon beam (from 500 to 1500 MeV) obtained by Compton scattering of laser light on the electron beam of ESRF (European Synchrotron Radiation Facility) in Grenoble. Mesons photoproduction off the nucleon allows to investigate the excited states of the nucleon. The p(γ,ηp) channel has been analysed and the cross-sections are given up to 1100 MeV. [ABSTRACT FROM AUTHOR]

Published
2001

7. Compton scattering at GRAAL.

Author

Moricciani, D., Bartalini, O., Bellini, V., Bocquet, J.-P., Capogni, M., Castoldi, M., D’Angelo, Annalisa, d’Angelo, Annelisa, Didelez, J. P., Di Salvo, R., Fantini, A., Gervino, G., Ghio, F., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kouznetsov, V., Lapik, A., and Levi, P.

Subjects
SCATTERING (Physics), PROTONS
Abstract

Preliminary results on the Compton scattering on the proton are presented in energy region around 1 GeV. Data are from the GRAAL facility: where a polarised γ-beam in the energy range of 500-1600 MeV is combined with a 4π detector having a very good energy resolution for photons. [ABSTRACT FROM AUTHOR]

Published
2001

8. π AND η PHOTOPRODUCTION OFF THE PROTON AT GRAAL.

Author

BARTALINI, O., CAPOGNI, M., D'ANGELO, A., DI SALVO, R., MORICCIANI, D., SCHAERF, C., BELLINI, V., SPERDUTO, M. L., BOCQUET, J. P., LLERES, A., NICOLETTI, L., REBREYEND, D., RENARD, F., CASTOLDI, M., ZUCCHIATTI, A., DIDELEZ, J. P., GUIDAL, M., HOURANY, E., KUNNE, R., and GERVINO, G.

Subjects
HYDROGEN, PROTONS, BARYON spectra, PION-nucleon interactions, NUCLEAR reactions
Published
2001

9. POLARIZED TARGET DEVELOPMENTS FOR GRAAL AND PROSPECTS.

Author

COMMEAUX, C., DIDELEZ, J.-P., ROUILLE, G., GUIDAL, M., HOURANY, E., KUNNE, R., ZHAO, Q., BASSAN, M., D'ANGELO, A., MORICCIANI, D., SCHAERF, C., BELLINI, V., BOCQUET, J.-P., LLERES, A., REBREYEND, D., CASTOLDI, M., ZUCCHIATTI, A., GERVINO, G., GHIO, F., and GIROLAMI, B.

Subjects
POLARIZATION (Nuclear physics), SPECTRUM analysis, PROTONS, POLARIMETRY, HYDROGEN
Published
2001

10. Measurement of $ \Sigma$ beam asymmetry in $ \pi^{0}_{}$ photoproduction off the neutron in the second and third resonances region⋆.

Author

Di Salvo, R., Fantini, A., Mandaglio, G., Mammoliti, F., Bartalini, O., Bellini, V., Bocquet, J. P., Casano, L., D’angelo, A., Didelez, J. P., Franco, D., Gervino, G., Ghio, F., Giardina, G., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kunne, R., and Lapik, A.

Subjects
PIONS, PARTICLES (Nuclear physics), DEUTERONS, PHOTON beams, PROTONS
Abstract

The $ \Sigma$ beam asymmetry in the photoproduction of neutral pions from quasi-free nucleons in a deuteron target was measured for the first time between 0.60 and 1.50GeV, with the GRAAL polarized and tagged photon beam. The asymmetry values from the quasi-free proton were found equal to the ones extracted from a pure proton target. The asymmetries from quasi-free proton and quasi-free neutron were found equal up to 0.82GeV and substantially different at higher energies. The results are compared with recent partial-wave analyses. [ABSTRACT FROM AUTHOR]

Published
2009
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11. Measurement of the total photoabsorption cross section on a proton in the energy range 600–1500 MeV at the GRAAL.

Author

Bartalini, O., Bellini, V., Bocquet, J. P., Calvat, P., D'Angelo, A., Didelez, J.-P., Di Salvo, R., Fantini, A., Ghio, F., Girolami, B., Guidal, M., Giusa, A., Hourany, E., Ignatov, A. S., Kunne, R., Lapik, A. M., Sandri, P.Levi, Lleres, A., Moricciani, D., and Mushkarenkov, A. N.

Subjects
PROTONS, LIGHT absorption, LIQUID hydrogen, PARTICLES (Nuclear physics), COMPTON effect
Abstract

The total photoabsorption cross section on a free proton was measured at the GRAAL facility in the energy range E γ = 600−1500 MeV. The large-aperture LAGRANγE detector and a liquid hydrogen target were used in the experiment performed with a back-scattered Compton gamma beam. To improve the accuracy, two alternative methods were employed. First, a subtraction method of using empty-target measurements allowed the cross section σ tot to be evaluated directly because of a low level of the electromagnetic background. Second, an algorithm for evaluating σ tot on the basis of summing the dominating partial cross sections was developed. Experimental results obtained for σ tot by the two methods are compared with existing data. [ABSTRACT FROM AUTHOR]

Published
2008
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12. 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

13. Measurement of $ \Sigma$ beam asymmetry in $ \pi^{0}_{}$ photoproduction off the neutron in the second and third resonances region⋆.

Author

Di Salvo, R., Fantini, A., Mandaglio, G., Mammoliti, F., Bartalini, O., Bellini, V., Bocquet, J. P., Casano, L., D’angelo, A., Didelez, J. P., Franco, D., Gervino, G., Ghio, F., Giardina, G., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kunne, R., and Lapik, A.

Subjects
*PIONS, *PARTICLES (Nuclear physics), *DEUTERONS, *PHOTON beams, *PROTONS
Abstract

The $ \Sigma$ beam asymmetry in the photoproduction of neutral pions from quasi-free nucleons in a deuteron target was measured for the first time between 0.60 and 1.50GeV, with the GRAAL polarized and tagged photon beam. The asymmetry values from the quasi-free proton were found equal to the ones extracted from a pure proton target. The asymmetries from quasi-free proton and quasi-free neutron were found equal up to 0.82GeV and substantially different at higher energies. The results are compared with recent partial-wave analyses. [ABSTRACT FROM AUTHOR]

Published
2009
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14. Double photoproduction on the neutron at GRAAL

Author

Ajaka, J., Assafiri, Y., Bartalini, O., Bellini, V., Bouchigny, S., Castoldi, M., D'Angelo, A., Didelez, J.P., Di Salvo, R., Fantini, A., Fichen, L., Gervino, G., Ghio, F., Girolami, B., Giusa, A., Guidal, M., Hourany, E., Kunne, R., Lapik, A., and Levi Sandri, P.

Subjects
*NEUTRONS, *HYDROGEN isotopes, *DEUTERIUM, *PROTONS
Abstract

Abstract: The photoproduction of double on the neutron is studied in the beam energy range of 0.6 up to 1.5 GeV, using a liquid deuterium target. The cross section and the beam asymmetry are extracted and compared to those previously obtained on a proton target. The theoretical interpretation of these results is given using different models. [Copyright &y& Elsevier]

Published
2007
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