The preliminary results obtained by the GRAAL collaboration for the π
0π + photoproduction on the free and quasi-free proton (deuteron) at E γ = 0.7-1.5 GeV are presented.
The γp → η‧p reaction was studied near the threshold, in the 1.44 GeV> E
γ < 1.55GeV energy range with the tagged photons of the former GRAAL experiment.
The study of meson photoproduction on the nucleon is a very important tool to complete the puzzle of baryon excited states.
The GRAAL experimental set-up consists of a polarized and tagged photon beam that covers an energy range from a minimum of 600 MeV up to a maximum of 1500 MeV
The Σ 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
Experimental results on proton and charged pion detection obtained from a study of the γ+n→p+π
− reaction are reported in detail.
In the framework of investigation of meson photo-production on proton and neutron in a deuterium target at the GRAAL experiment, we present a method to identify the vertex of interaction
We are proposing a comprehensive program to study transverse momentum dependence of valence quark transverse and longitudinal spin distributions
The double polarization (beam-recoil) observables Ox and Oz have been measured for the reaction γp → K+Λ from threshold production to E ∼ 1500MeV.
We present recent Graal results on beam-polarization asymmetries in the photoproduction of
η meson on protons and neutrons in Hydrogen and Deuterium for the incoming photon energy range from threshold to 1.5 GeV.