Study of two-photon decay in He-like gold

S. Trotsenko, D.Banas, A.Gumberidze, C.Kozhuharov, R. Zhang, A. Ananyeva, H.Beyer, K.-H. Blumenhagen, C. Brandau, A.Bräuning-Demian, W. Chen, B. Gao, T. Gassner, S.Hagmann, P.-M. Hillenbrand, M. Lestinsky, Y. Litvinov, N. Petridis, S. Schippers, D. Schury, U.Spillmann, C. Trageser, M. Trassinelli, X. Tu, D. Winters, X. Zhu, and Th. Stöhlker Helmholtz-Institut Jena, D-07743 Jena, Germany; GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany; University of Kielce, Kielce, Poland; Justus-Liebig-Universität Giessen, Germany, University of Frankfurt, Frankfurt a.M., Germany; INSP, CNRS and UMPC, Paris, France; Friedrich-Schiller-Universität Jena, D07743 Jena, Germany