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Doroshkevich, E. Perez del Rio, F. Goldenbaum, F. Hinterberger, F. Kren, F.S. Bergmann, G.J. Wagner, G. Kemmerling, G. Sterzenbach, H. Bhatt, H. Calen, H. Clement, H. Kleines, H. Ohm, H.-P. Morsch, H. Stockhorst, H. Stroeher, J. Hampe, J. Jaus, J. Klaja, J. Ritman, J. Smyrski, J. Stepaniak, J. Zabierowski, J. Zlomanczuk, K. Foehl, K. Fransson, K. Grigoryev, K. Lalwani, K. Pysz, K.-T. Brinkmann, L. Heijkenskj, L. Jarczyk, L. Yurev, M. Bashkanov, M. Berlowski, M. Buescher, M. Hodana, M. Jacewicz, M. Janusz, M.J. Zielinski, M. Mikirtychiants, M. Siemaszko, M. Skurzok, M. Wolke, N. Piskunov, N. Shah, O. Khakimova, P. Adlarson, P. Fedorets, P. Goslawski, P. Kulessa, P. Marciniewski, P. Moskal, P. Plucinski, P. Podkopal, P. Vlasov, P. Wuestner, P. Wurm, P. Zupranski, R. Engels, R.J.M.Y. Ruber, R. Maier, R. Siudak, R. Stassen, R. Varma, S. Kistryn, S. Kullander, S. Schadmand, T. Johansson, T. Rausmann, T. Sefzick, T. Skorodko, T. Tolba, V. Baru, V. Grishina, V. Hejny, V. Serdyuk, V. Sopov, W. Augustyniak, W. Erven, W. Eyrich, W. Krzemien, W. Schroeder, W. Weglorz, W. Zipper, Y. Petukhov, Z. Rudy","submitted_at":"2011-04-01T09:53:49Z","abstract_excerpt":"We report on a high-statistics measurement of the basic double pionic fusion reaction $pn \\to d\\pi^0\\pi^0$ over the energy region of the so-called ABC effect, a pronounced low-mass enhancement in the $\\pi\\pi$-invariant mass spectrum. The measurements were performed with the WASA detector setup at COSY. The data reveal the ABC effect to be associated with a Lorentzian shaped energy dependence in the integral cross section. The observables are consistent with a resonance with $I(J^P) =0(3^+)$ in both $pn$ and $\\Delta\\Delta$ systems. 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