مقال مُحكّم

This article tackles the interest rates’ convergence issue within 27 European countries. In this context, a series of data related to the interest rates within the aforementioned countries was used in order to test the rates’ convergence…
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The analysis of the γp→ηπ0p 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…
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J. Ajaka et al., 2008, Simultaneous photoproduction of eta and pi0 mesons on the proton, Phys. Rev. Lett. 100 (2008) 052003, DOI: 10.1103/PhysRevLett.100.052003, Cited by 46 articles…
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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…
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The photoproduction of the ω meson has been studied at GRAAL from threshold up to a photon energy of 1.5 GeV. The differential cross sections and beam asymmetries have been measured precisely at all angles. The total cross section is also…
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Since 1996 the GRAAL experiment is running at the ESRF, using a linearly polarized photon beam produced by backscattering a laser beam on the electron beam in the storage ring. A liquid hydrogen target and a large acceptance detector are…
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Since 1996 the GRAAL experiment is running at the ESRF, using a linearly polarized photon beam produced by backscattering a laser beam on the electron beam in the storage ring. A liquid hydrogen target and a large acceptance detector are…
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Precise measurement of Sigma beam asymmetry for positive pion photoproduction on the proton from 550-MeV to 1100-MeV, J. Ajaka et al., 2000, Phys.Lett. B475 (2000) 372-377, DOI: 10.1016/S0370-2693(99)01396-9, Abstract Σ beam…
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Ajaka, J., et al. “Beam Asymmetry Measurements at GRAAL.” Acta Physica Hungarica A 11.3-4 (2000): 3-4
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  Author links open overlay panelJ. Ajaka, et al., 1999, Beam asymmetry Sigma in meson photoproduction at GRAAL, Published in Nuclear Physics A vol. 654 issue 1 July 26, 1999. p. 531c-534c Volume 654, Issue 1, Supplement 1,…
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The GRAAL tagged and polarized γ beam has been operating with a maximum energy of 1100 MeV. For the first time asymmetry results in ν photoproduction were obtained and will be shown. Interesting results have also been obtained for π0 and π+…
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Beam Polarisation Asymmetries in Meson Photoproduction at Graal J. Ajaka, et al., 1999, Beam polarization asymmetries in meson photoproduction at Graal, Published in Few Body Syst.Suppl. 11 (1999) 216-221, Given at the Joint ECT* /…
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We present new Σ beam asymmetry data for η meson photoproduction on the proton, using a novel tagged, laser backscattered, linearly polarized photon beam up to 1.1 GeV. The data show large, positive asymmetries, at all incident photon…
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J. Ajaka et al., 1998, New measurement of Sigma beam asymmetry for eta meson photoproduction on the proton, Published in Phys. Rev. Lett. 81 (1998) 1797-1800, DOI: 10.1103/PhysRevLett.81.1797, Cited by 224 articles.…
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The photoproduction of η meson on hydrogen has been measured from threshold to 1100 MeV in GRAAL experiment performed in 1996-1997 at the ESRF in Grenoble by a Collaboration of Italian, French and Russian groups.
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The general nodal structure approach is applied to the recent γp⃗→ηp T-asymmetry data from ELSA. The reaction mechanism is found to require, in addition to the dominant S11 and D13 resonances, contributions from P13 and D15 resonances. This…
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The GRAAL facility produces a highly polarized gamma-ray beam by Compton scattering of laser photons on the electrons of the European Synchrotron Radiation Facility (ESRF) at Grenoble. Preliminary results have been obtained with the…
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We present new break-up and coherent data for η meson photoproduction on the deuteron, using a deuterium target and tagged bremsstrahlung photons up to 1 GeV. The differential cross sections for the coherent process were measured from…
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All sixteen observables for the reaction gamma + p --> eta + p have been investigated from threshold up to 1.2 GeV. The formalism is based on an isobar model. In this approach electric and magnetic multipole amplitudes are expressed in…
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