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Now showing items 17 - 21 of 21

  • BEAM ASYMMETRY Sigma OF THE pi(-) PHOTOPRODUCTION OFF NEUTRON RID B-1239-2012 RID A-2439-2012

    Mandaglio, G.   Bellini, V.   Bocquet, J. P.   Casano, L.   D'Angelo, A.   Di Salvo, R.   Fantini, A.   Franco, D.   Gervino, G.   Ghio, F.   Giardina, G.   Girolami, B.   Giusa, A.   Ignatov, A. S.   Lapik, A. M.   Sandri, P. Levi   Lleres, A.   Mammoliti, F.   Manganaro, M.   Moricciani, D.   Mushkarenkov, A. N.   Nedorezov, V. G.   Randieri, C.   Rebreyend, D.   Rudnev, N. V.   Russo, G.   Schaerf, C.   Sperduto, M. L.   Sutera, M. C.   Turinge, A.   Vegna, V.  

    We present the analysis of data performed in order to identify the events of the gamma + n -> pi(-) + p reaction obtained by bombarding a liquid Deuterium target with a polarised. beam of 0.55-1.5 GeV at the Graal-experiment. We show the effect of different kinematic and hardware constraints used to reduce the contamination coming from the concurrent reaction channels. By the simulation we estimate the contamination degree due to the other reaction channels so we can test the reliability of our method. We describe a new three-dimensional cut based on the Fermi momentum reconstruction and its effect on the suppression of the concurrent double charged pion photoproduction. We present the preliminary beam asymmetry Sigma of the pi(-) fotoproduction off quasi-free neutron up to about theta(c.m.), (pi-) = 165 degrees together with some theoretical multipolar analysis. For a comparison we also report the data present in literature on the same reaction for E(gamma) -850-1740 MeV and theta(c.m.), (pi-) <= 105 degrees.
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  • Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins

    Altarev, I.   Ban, G.   Bison, G.   Bodek, K.   Daum, M.   Fertl, M.   Fierlinger, P.   Franke, B.   Gutsmiedl, E.   Heil, W.   Henneck, R.   Horras, M.   Khomutov, N.   Kirch, K.   Kistryn, S.   Kraft, A.   Knecht, A.   Knowles, P.   Kozela, A.   Lauer, T.   Lauss, B.   Lefort, T.   Lemiere, Y.   Mtchedlishvili, A.   Naviliat-Cuncic, O.   Pazgalev, A.   Petzoldt, G.   Piegsa, F. M.   Pierre, E.   Pignol, G.   Quemener, G.   Rebetez, M.   Rebreyend, D.   Roccia, S.   Schmidt-Wellenburg, P.   Severijns, N.   Sobolev, Yu   Weis, A.   Zejma, J.   Zenner, J.   Zsigmond, G.  

    Physics at the Planck scale could be revealed by looking for tiny violations of fundamental symmetries in low energy experiments. In 2008, a sensitive test of the isotropy of the universe has been performed with stored ultracold neutrons (UCN), this is the first clock-comparison experiment performed with free neutrons. During several days we monitored the Larmor frequency of neutron spins in a weak magnetic field using the Ramsey resonance technique. A nonzero cosmic axial field, violating rotational symmetry, would induce a daily variation of the precession frequency. Our null result constitutes one of the most stringent tests of Lorentz invariance to date. (C) 2010 Elsevier B.V. All rights reserved.
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  • Magnetic-field uniformity in neutron electric-dipole-moment experiments

    Abel, C.   Ayres, N. J.   Baker, T.   Ban, G.   Bison, G.   Bodek, K.   Bondar, V.   Crawford, C. B.   Chiu, P.-J.   Chanel, E.   Chowdhuri, Z.   Daum, M.   Dechenaux, B.   Emmenegger, S.   Ferraris-Bouchez, L.   Flaux, P.   Geltenbort, P.   Green, K.   Griffith, W. C.   van der Grinten, M.   Harris, P. G.   Henneck, R.   Hild, N.   Iaydjiev, P.   Ivanov, S. N.   Kasprzak, M.   Kermaidic, Y.   Kirch, K.   Koch, H.-C.   Komposch, S.   Koss, P. A.   Kozela, A.   Krempel, J.   Lauss, B.   Lefort, T.   Lemiere, Y.   Leredde, A.   Mohanmurthy, P.   Pais, D.   Piegsa, F. M.   Pignol, G.   Quéméner, G.   Rawlik, M.   Rebreyend, D.   Ries, D.   Roccia, S.   Rozpedzik, D.   Schmidt-Wellenburg, P.   Schnabel, A.   Severijns, N.   Virot, R.   Weis, A.   Wursten, E.   Wyszynski, G.   Zejma, J.   Zsigmond, G.  

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  • Measurement of a false electric dipole moment signal from Hg-199 atoms exposed to an inhomogeneous magnetic field

    Afach, S.   Baker, C. A.   Ban, G.   Bison, G.   Bodek, K.   Chowdhuri, Z.   Daum, M.   Fertl, M.   Franke, B.   Geltenbort, P.   Green, K.   van der Grinten, M. G. D.   Grujic, Z.   Harris, P. G.   Heil, W.   Helaine, V.   Henneck, R.   Horras, M.   Iaydjiev, P.   Ivanovf, S. N.   Kasprzak, M.   Kermaidic, Y.   Kirch, K.   Knowles, P.   Koch, H. -C.   Komposch, S.   Kozela, A.   Krempel, J.   Lauss, B.   Lefort, T.   Lemiere, Y.   Mtchedlishvili, A.   Naviliat-Cuncic, O.   Pendlebury, J. M.   Piegsa, F. M.   Pignol, G.   Prashant, P. N.   Quemener, G.   Rebreyend, D.   Ries, D.   Roccia, S.   Schmidt-Wellenburg, P.   Severijns, N.   Weis, A.   Wursten, E.   Wyszynski, G.   Zejma, J.   Zenner, J.   Zsigmond, G.  

    We report on the measurement of a Larmor frequency shift proportional to the electric-field strength for Hg-199 atoms contained in a volume permeated with aligned magnetic and electric fields. This shift arises from the interplay between the inevitable magnetic field gradients and the motional magnetic field. The proportionality to electric-field strength makes it apparently similar to an electric dipole moment (EDM) signal, although unlike an EDM this effect is P- and T-conserving. We have used a neutron magnetic resonance EDM spectrometer, featuring a mercury co-magnetometer and an array of external cesium magnetometers, to measure the shift as a function of the applied magnetic field gradient. Our results are in good agreement with theoretical expectations.
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  • New experimental and simulated results on nuclear media effects in meson photoproduction off nuclei RID B-1239-2012 RID A-2439-2012

    Ignatov, A.   Bartalini, O.   Bellini, V.   Bocquet, J. P.   Calvat, P.   Capogni, M.   Casano, M.   Castoldi, M.   D'Angelo, A.   Didelez, J. -P.   Di Salvo, R.   Fantini, A.   Gervino, G.   Ghio, F.   Girolami, B.   Giusa, A.   Guidal, M.   Hourany, E.   Kouznetsov, V.   Kunne, R.   Lapik, A.   Sandri, P. Levi   Lleres, A.   Moricciani, D.   Mushkarenkov, A.   Nedorezov, V.   Nicoletti, L.   Perrin, C.   Rebreyend, D.   Renard, F.   Rudnev, N.   Russew, T.   Russo, G.   Schaerf, C.   Sperduto, M. -L.   Sutera, M. -C.   Turinge, A.  

    New experimental approach to study meson photoproduction in nuclei is discussed. It is based on the measurement of the recoil nucleon as a tagger for identification of the initial step of reaction. Propagation of mesons and nucleons within a nucleus is described by the Intra-Nuclear Cascade (INC) model. Simulations and preliminary experimental data for the deuteron target obtained at GRAAL are presented. (c) 2008 Elsevier B.V. All rights reserved.
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