The.GRAAL e.pe.ime.tal se.-up consists of a polarize. and tagge. photon be.m that cove.s an e.e.gy range.from a minimum of 600 Me. up to a maximum of 1500 Me., of a liquid Hydroge. or De.te.ium targe. and of the.4π L...
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The.GRAAL e.pe.ime.tal se.-up consists of a polarize. and tagge. photon be.m that cove.s an e.e.gy range.from a minimum of 600 Me. up to a maximum of 1500 Me., of a liquid Hydroge. or De.te.ium targe. and of the.4π Lagrange.de.e.tor optimize. for photon de.e.tion. It allows the.study of pse.do-scalar and ve.tor me.on photoproduCtion on the.nucle.n in the.e.e.gy range.corre.ponding to the.se.ond and the.third re.onance.re.ions. In the.following, the.∑ be.m asymme.rie. in η and π0 photoproduction on quasi-fre. nucle.n are.shown. Also single.and double.polarization obse.vable. in K+A photoproduction on fre. proton are.shown; the. are.important to confirm the.role.of ne. or poorly known re.onance. in the.1900 Me. mass re.ion.
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