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Budzanowski, A. Khoukaz, A. Kozela, A. Strza{\\l}kowski, C. Goodman, C. Hanhart, C. Quentmeier, C. Thomas, D. Grzonka, D. Wyrwa, G. Schepers, H. Dombrowski, J. Haidenbauer, J. Smyrski, J. T. Balewski, K. Kilian, L. Jarczyk, M. Jochmann, M. K\\\"ohler, M. Soko{\\l}owski, M. Wolke, N. Nikolaev, P. Moskal, P. W\\\"ustner, R. Santo, T. Lister, T. Sefzick, U.-G. Mei{\\ss}ner, U. Seddik, W. Oelert","submitted_at":"1998-03-04T17:48:01Z","abstract_excerpt":"The $pp \\to pp \\eta^{\\prime}$ (958) reaction has been measured at COSY using the internal beam and the COSY-11 facility. The total cross sections at the four different excess energies \\mbox{$ Q = ~1.5 ~MeV, ~1.7 ~MeV, ~2.9 ~MeV,$ and $ ~4.1 MeV$} have been evaluated to be \\mbox{$ \\sigma = 2.5 \\pm 0.5~nb$, $~~~ 2.9 \\pm 1.1~nb$, $~~~ 12.7 \\pm 3.2~nb$, ~ and $~~~ 25.2 \\pm 3.6 ~nb $}, respectively. 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