Scientific Article

Terahertz (THz) plasma oscillation in n+nn+ InGaAs vertical diodes is studied by using a numerical approach based on the hydrodynamic (HD) equations. The 1D HD model is coupled to 1D Poisson equation. We simulate the diode response to the…
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An analysis of generated Terahertz (THz) current oscillations taking place in one dimensional n+nn+ InGaAs diodes due to an optical photoexcitation and due to a dc operating bias are presented at room temperature. These oscillations have…
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We use a hydrodynamic model self-consistently coupled to a 1D Poisson solver to simulate the excitation by optical beating as well as by electrical perturbation of plasma waves in n+nn+ InGaAs diodes at room temperature. We calculate the…
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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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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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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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