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.
We present the first measurement of the Σ beam asymmetry in η photoproduction on the neutron in the photon energy range from threshold to 1.5 GeV.
The analysis of the γp→ηπ
0p reaction has been performed using data from the GRAAL experiment.
Beam asymmetry and differential cross section for the reaction γρ were measured from production threshold to 1500 MeV photon laboratory energy.
The photoproduction of double π
0 on the neutron is studied in the beam energy range of 0.6 up to 1.5 GeV, using a liquid deuterium target.
Meson photoproduction with polarized photons has proved to be a powerful tool to identify contributions of baryon resonances that are not evident in the differential cross-sections.
Using a Deuterium target, the GRAAL experiment has collected meson photoproduction data. The data have been analysed in the quasi free regime.
Beam asymmetries and hyperon recoil polarizations for the reactions γ p → K
+Λ and γ p → K +Σ 0 have been measured from the threshold production to 1500MeV with the GRAAL facility located at the ESRF in Grenoble.
The γn → ηn quasi-free cross section reveals a resonant structure at W ~ 1.675 GeV. This structure may be a manifestation of a baryon resonance.
New data on η photoproduction off the neutron are presented. These data reveal a resonant structure at W=1.67 GeV.