Castoldi, M.
Di Salvo, R.
Ghio, F.
Girolami, B.
Zucchiatti, A.
Bellini, V.
Capogni, M.
Casano, L.
et. al.
The temperature variations of a BGO crystal ball were monitored with a set of 177 platinum probes and followed in their evolution with time. This allowed the control of the temperature dependence of the calibration parameters of the calorimeter and the evaluation of its contribution to the energy resolution.
Bocquet, J.P.
Ajaka, J.
Anghinolfi, M.
Bellini, V.
Berrier, G.
Calvat, P.
Capogni, M.
Casano, L.
Castoldi, M.
Corvisiero, P.
D'Angelo, A.
Didelez, J.P.
Di Salvo, R.
Djalali, C.
Duval, M.A.
Frascaria, R.
Gervino, G.
Ghio, F.
Girard, P.
Girolami, B.
Guinault, E.
Hourani, E.
Kuznetsov, V.
Lapik, A.
Levi Sandri, P.
Lo Nigro, S.
Moricciani, D.
Morlet, M.
Muccifora, V.
Nedorezov, V.
Perrin, C.
Rebreyend, D.
Renard, F.
Ricco, G.
Rigney, M.
Ripani, M.
Rosier, L.
Rossi, P.
Russew, T.
Sanzone, M.
Schaerf, C.
Scire, A.
Sperduto, M.L.
Sudov, A.
Taiuti, M.
Turinge, A.
Van de Wiele, J.
Vinciguerra, D.
Zucchiatti, A.
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
Bassan, M.
Bouchigny, S.
Commeaux, C.
Didelez, J.-P.
Rouille, G.
Schaerf, C.
Bellini, V.
Bocquet, J.-P.
Castoldi, M.
D'Angelo, A.
Di Salvo, R.
Fantini, A.
Ghio, F.
Girolami, B.
Guidal, M.
Hourany, E.
Kunne, R.
Sandri, P.L.
Lleres, A.
Moricciani, D.
Rebreyend, D.
The static polarization of HD samples has been achieved using "brute force", for HD samples purified by double distillation. Proton polarization in excess of 60% and deuteron vector polarization higher than 14% have been reached. It has been demonstrated that the ageing technique allows to get relaxation times at 1.5 K and 1 T larger than a week. It is advocated that the conventional dynamic polarization of HD should be feasible for the proton and the deuteron contained in the HD molecule. This would simplify considerably the machinery presently necessary to perform nuclear physics experiments with HD targets polarized by the static method
Bartalini, O.
Bellini, V.
Bocquet, J. P.
Calvat, P.
Capogni, M.
Casano, L.
Castoldi, M.
D'Angelo, A.
Didelez, J.-P.
Di Salvo, R.
Fantini, A.
Franco, D.
Gaulard, C.
Gervino, G.
Ghio, F.
Giardina, G.
Girolami, B.
Giusa, A.
Guidal, M.
Hourany, E.
Kunne, R.
Lapik, A.
Sandri, P. Levi
Lleres, A.
Mammoliti, F.
Mandaglio, G.
Moricciani, D.
Mushkarenkov, A. N.
Nedorezov, V.
Nicoletti, L.
Perrin, C.
Randieri, C.
Rebreyend, D.
Renard, F.
Rudnev, N.
Russew, T.
Russo, G.
Schaerf, C.
Sperduto, M.-L.
Sutera, M.-C.
Turinge, A.
Vegna, V.
Beam asymmetry and differential cross-section for the reaction gamma p -> eta p were measured from production threshold to 1500MeV photon laboratory energy. The two dominant neutral decay modes of the eta-meson, eta -> 2 gamma and eta -> 3 pi(0) , were analyzed. The full set of measurements is in good agreement with previously published results. Our data were compared with three models. They all fit satisfactorily the results but their respective resonance contributions are quite different. The possible photoexcitation of a narrow state N(1670) was investigated and no evidence was found.
D'Angelo, A.
Ardashev, K.
Bade, C.
Bartalini, O.
Bellini, V.
Blecher, M.
Bocquet, J. -P.
Capogni, M.
Caracappa, A.
Casano, L. E.
Castoldi, M.
Di Salvo, R.
Fantini, A.
Franco, D.
Gervino, G.
Ghio, F.
Giardina, G.
Gibson, C.
Girolami, B.
Giusa, A.
Gluekler, H.
Hicks, K.
Hoblit, S.
Honig, A.
Kageya, T.
Khandaker, M.
Kistner, O. C.
Kizilgul, S.
Kucuker, S.
Lapik, A.
Lehmann, A.
Sandri, P. Levi
Lieres, A.
Lowry, M.
Lucas, M.
Mahon, J.
Mammoliti, F.
Mandaglio, G.
Manganaro, M.
Miceli, L.
Moricciani, D.
Mushkarenkov, A.
Nedorezov, V.
Norum, B.
Pap, M.
Preedom, B.
Seyfarth, H.
Randieri, C.
Rebreyend, D.
Rudnev, N.
Russo, G.
Sandorfi, A.
Schaerf, C.
Sperduto, M. -L.
Stroher, H.
Sutera, M. -C.
Thorn, C. E.
Turinge, A.
Vegna, V.
Whisnant, C. S.
Wang, K.
Wei, X.
Compton backscattering gamma ray beams are characterized by a high degree of linear and circular polarization with low unpolarized backgrounds and have proven to provide very precise measurements of polarization observables. Latest results from LEGS and GRAAL experiments on proton and deuteron targets are presented. The Sigma beam asymmetry for omega photoproduction has been measured by the GRAAL collaboration for both the omega -> pi(0)gamma and the omega -> pi(+)pi(+)pi(0) decay channels on the proton target; single and double polarization asymmetries have been provided also for the K photoproduction channel. E and G double polarization asymmetries for single pion photoproduction on the proton and deuteron have been measured at LEGS using a frozen spin HD target.
Lleres, A.
Bartalini, O.
Bellini, V.
Bocquet, J. P.
Calvat, P.
Capogni, M.
Casano, L.
Castoldi, M.
D'Angelo, A.
Didelez, J. -P.
Di Salvo, R.
Fantini, A.
Gaulard, C.
Gervino, G.
Ghio, F.
Girolami, B.
Giusa, A.
Guidal, M.
Hourany, E.
Kouznetsov, V.
Kunne, R.
Lapik, A.
Sandri, P. Levi
Moricciani, D.
Mushkarenkov, A. N.
Nedorezov, V.
Nicoletti, L.
Perrin, C.
Randieri, C.
Rebreyend, D.
Renard, F.
Rudnev, N.
Russew, T.
Russo, G.
Schaerf, C.
Sperduto, M. -L.
Sutera, M. -C.
Turinge, A.
Beam asymmetries and hyperon recoil polarizations for the reactions gamma p --> K+ Lambda and gamma p --> K+ Sigma(0) have been measured from the threshold production to 1500 MeV with the GRAAL facility located at the ESRF in Grenoble. These results complement the database for the beam asymmetry, covering for the first time the production threshold region. Recent theoretical analyses are presented for which the beam asymmetry data bring interesting new information and allow to better determine some resonance parameters. Most importantly, these results strengthen the need of a new D-13 state around 1900 MeV.
Zucchiatti, A.
Castoldi, M.
Gervino, G.
Terzi, F.
Anghinolfi, M.
Bianchi, N.
Casano, L.
Corvisiero, P.
D'Angelo, A.
De Sanctis, E.
Girolami, B.
Levi Sandri, P.
Lucherini, V.
Mazzaschi, L.
Mokeev, V.
Muccifora, V.
Picozza, P.
Polli, E.
Reolon, A.R.
Ricco, G.
Ripani, M.
Rossi, P.
Sanzone, M.
Schaerf, C.
Taiuti, M.
The behaviour of BGO sectors, designed for an electromagnetic calorimeter to be operated at up to 2 GeV, is considered in relation to the different terms that contribute to the overall BGO resolution and to the techniques that can be adopted to reduce them to a minimum. In particular, the measurements of light collection uniformity and energy resolution obtained on a large number of sectors are reported, and their effect on the overall BGO resolution analyzed
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