The GRa.L experimenta. set-up consists of a.pola.ized a.d ta.ged photon bea. tha. covers a. energy ra.ge from a.minimum of 600 MeV up to a.ma.imum of 1500 MeV, of a.liquid Hydrogen or Deuterium ta.get a.d of the 4π L...
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The GRa.L experimenta. set-up consists of a.pola.ized a.d ta.ged photon bea. tha. covers a. energy ra.ge from a.minimum of 600 MeV up to a.ma.imum of 1500 MeV, of a.liquid Hydrogen or Deuterium ta.get a.d of the 4π La.ra.ge detector optimized for photon detection. It a.lows the study of pseudo-sca.a. a.d vector meson photoproduCtion on the nucleon in the energy ra.ge corresponding to the second a.d the third resona.ce regions. In the following, the ∑ bea. a.ymmetries in η a.d π0 photoproduction on qua.i-free nucleon a.e shown. a.so single a.d double pola.iza.ion observa.les in K+a.photoproduction on free proton a.e shown; they a.e importa.t to confirm the role of new or poorly known resona.ces in the 1900 MeV ma.s region.
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