Categoria: Fisica Nucleare

The preliminary results obtained by the GRAAL collaboration for the π0π+ photoproduction on the free and quasi-free proton (deuteron) at Eγ = 0.7-1.5 GeV are presented.

The γp → η‧p reaction was studied near the threshold, in the 1.44 GeV> Eγ < 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.