ABC Effect and Resonance Structure in the Double-Pionic Fusion to ³He
Adlarson, P. · Augustyniak, W. · Bardan, W. · Bashkanov, M. · Bergmann, F. S. · Berłowski, M. · Bhatt, H. · Bondar, A. · Büscher, M. · Calén, H. · Ciepał, I. · Clement, H. · Coderre, D. · Czerwiński, E. · Demmich, K. · Doroshkevich, E. · Engels, R. · Erven, A. · Erven, W. · Eyrich, W. · Fedorets, P. · Föhl, K. · Fransson, K. · Goldenbaum, F. · Goslawski, P. · Goswami, A. · Grigoryev, K. · Gullström, C. --O. · Hauenstein, F. · Heijkenskjöld, L. · Hejny, V. · Höistad, B. · Hüsken, N. · Jarczyk, L. · Johansson, T. · Kamys, B. · Kemmerling, G. · Khan, F. A. · Khoukaz, A. · Kirillov, D. A. · Kistryn, S. · Kleines, H. · Kłos, B. · Krzemień, W. · Kulessa, P. · Kupść, A. · Kuzmin, A. · Lalwani, K. · Lersch, D. · Lorentz, B. · Magiera, A. · Maier, R. · Marciniewski, P. · Mariański, B. · Mikirtychiants, M. · Morsch, H. -P. · Moskal, P. · Ohm, H. · Ozerianska, I. · del Rio, E. Perez · Piskunov, N. M. · Podkopał, P. · Prasuhn, D. · Pricking, A. · Pszczel, D. · Pysz, K. · Pyszniak, A. · Ritman, J. · Roy, A. · Rudy, Z. · Sawant, S. · Schadmand, S. · Sefzick, T. · Serdyuk, V. · Shwartz, B. · Siudak, R. · Skorodko, T. · Skurzok, M. · Smyrski, J. · Sopov, V. · Stassen, R. · Stepaniak, J. · Stephan, E. · Sterzenbach, G. · Stockhorst, H. · Ströher, H. · Szczurek, A. · Täschner, A. · Trzciński, A. · Varma, R. · Wagner, G. J. · Wolke, M. · Wrońska, A. · Wüstner, P. · Wurm, P. · Yamamoto, A. · Yurev, L. · Zabierowski, J. · Zieliński, M. J. · Zink, A. · Złomańczuk, J. · Żuprański, P. · Żurek, M.
الأصل · EN
Exclusive and kinematically complete measurements of the double pionic fusion to ³He have been performed in the energy region of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the ππ-invariant mass spectrum. The experiments were carried out with the WASA detector setup at COSY. Similar to the observations in the basic pn → d π⁰π⁰ reaction and in the dd → ⁴Heπ⁰π⁰ reaction, the data reveal a correlation between the ABC effect and a resonance-like energy dependence in the total cross section. Differential cross sections are well described by the hypothesis of d* resonance formation during the reaction process in addition to the conventional t-channel ΔΔ mechanism. The deduced d* resonance width can be understood from collision broadening due to Fermi motion of the nucleons in initial and final nuclei.
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