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        CAST search for sub-eV mass solar axions with 3He buffer gas

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        Author
        Arik, M.
        Aune, S.
        Barth, K.
        Belov, A.
        Borghi, S.
        Bräuninger, H.
        Cantatore, G.
        Carmona, J.M.
        Cetin, S.A.
        Collar, J.I.
        Dafni, T.
        Davenport, M.
        Eleftheriadis, C.
        Elias, N.
        Ezer, C.
        Fanourakis, G.
        Ferrer-Ribas, E.
        Friedrich, P.
        Galán, J.
        García, J.A.
        Gardikiotis, A.
        Gazis, E.N.
        Geralis, T.
        Giomataris, I.
        Gninenko, S.
        Gómez, H.
        Gruber, E.
        Guthörl, T.
        Hartmann, R.
        Haug, F.
        Hasinoff, M.D.
        Hoffmann, D.H.H.
        Iguaz, F.J.
        Irastorza, I.G.
        Jacoby, J.
        Jakovčić, K.
        Karuza, M.
        Königsmann, K.
        Kotthaus, R.
        Krčmar, M.
        Kuster, M.
        Lakić, B.
        Laurent, J.M.
        Liolios, A.
        Ljubičić, A.
        Lozza, V.
        Lutz, G.
        Luzón, G.
        Morales, J.
        Niinikoski, T.
        Nordt, A.
        Papaevangelou, T.
        Pivovaroff, M.J.
        Raffelt, G.
        Rashba, T.
        Riege, H.
        Rodríguez, A.
        Rosu, M.
        Ruz, J.
        Savvidis, I.
        Silva, P.S.
        Solanki, S.K.
        Stewart, L.
        Tomás, A.
        Tsagri, M.
        van Bibber, K.
        Vafeiadis, T.
        Villar, J.
        Vogel, J.K.
        Yildiz, S.C.
        Zioutas, K.(CAST Collaboration)
        Date
        2012
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        Abstract
        The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows for larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each of 252 different pressure settings we have scanned the axion mass range 0.39 eV < m_a < 0.64 eV. From the absence of excess X-rays when the magnet was pointing to the Sun we set a typical upper limit on the axion-photon coupling of g_ag < 2.3 x 10^{-10} GeV^{-1} at 95% CL, the exact value depending on the pressure setting. KSVZ axions are excluded at the upper end of our mass range, the first time ever for any solar axion search. In future we will extend our search to m_a < 1.15 eV, comfortably overlapping with cosmological hot dark matter bounds.
        Description
        The article of record as published may be located at http://dx.doi.org/10.1103/PhysRevLett.107.261302
        URI
        http://hdl.handle.net/10945/35446
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