ELSEVIER Nuclear Physics A622 (1997) 124c-129c NUCLEAR PHYSICS A GRAAL " a polarized T-ray beam at ESRF* J.P. Bocquet a, j. Ajaka b, M. Anghinolfi c V. Bellini a, G. Berrier b P. Calvat a, M. Capogni f, L. Casano f, M. Castoldi c, p. Corvisiero c, A. D'Angelo f, J.P. Didelez b, R. Di Salvo g, Ch. Djalali b, M.A. Duval b R. Frascaria b, G. Gervino g, F. Ghio h, p. Girard b, B. Girolami h, E. Guinault b, E. Hourani b, V. Kuznetsov i, A. Lapik i, p. Levi Sandri e, S. Lo Nigro d, D. Moricciani f, M. Morlet b, V. Muccifora e, V. Nedorezov i C. Perrin ~, D. Rebreyend a, F. Renard ~, G. Ricco ¢, M. Rigney b, M. Ripani e, L. Rosier b, P. Rossi e, Th. Russew a, M. Sanzone c, C. Schaerf f, A. Scire d, M. L. Sperduto d, A. Sudov i M. Taiuti e, A. TuringeJ, J. Van de Wiele b, D. Vinciguerra d and A. Zucchiatti ~: Institut des Sciences Nucldaires de Grenoble, France b Institut de Physique Nucldairc d'Orsay, France c INFN sezione di Genova and Universith di Genova, Italy d INFN Laboratori Nazionali del Sud and Universitfi di Catania, Italy e Laboratori Nazionali di Frascati, Italy f INFN sezione di Roma II and Universita di Tot Vergata, Italy g INFN sezione di Torino and Universitd di Torino, Italy h INFN sezione Sanith and Instituto Superiore di Sanitit, Roma, Italy i Institute for Nuclear Research, Moscow, Russia J Kurchatov Institute of Atomic Energy, Moscow, Russia Abstract The GRAAL facility produces a highly polarized gamma-ray beam by Compton scattering of laser photons on the electrons of the European Synchrotron Radiation Facility (ESRF) at Grenoble. Preliminary results have been obtained with the LAGRANGE detector showing its excellent performances. 0375-9474/97/$17.00 1997 - Elsevier Science B.V. PII: S0375-9474(97)00337-0