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  • Investigation of the dd -> 3He n \pi 0 reaction with the FZ Jülich WASA-at-COSY facility
    WASA-at-COSY Collaboration; Adlarson, P; Augustyniak, W; Bardan, W; Bashkanov, M; Bergmann, F S; Berłowski, M; Bhatt, H; Büscher, M; Calén, H; Ciepał, I; Clement, H; Coderre, D; Czerwiński, E; Demmich, K; Doroshkevich, E; Engels, R; Erven, W; Eyrich, W; Föhl, K; Fransson, K; Goldenbaum, F; Goswami, A; Grigoryev, K; C --O Gullström; Hanhart, C; Hauenstein, F; Hejny, V; Hinterberger, F; Hodana, M; Höistad, B; Jany, A; Jany, B R; Jarczyk, L; Johansson, T; Kemmerling, G; Khan, F A; Khoukaz, A; Kirillov, D A; Kistryn, S; Klaja, J; Kleines, H; Kłos, B; Krapp, M; Krzemień, W; Kulessa, P; Kupść, A; Lalwani, K; Lersch, D; L Li; Magiera, A; Maier, R; Marciniewski, P; Mariański, B; Moskal, P; Nandi, B K; Ohm, H; Perez del Rio, E; Piskunov, N M; Pluciński, P; Prasuhn, D; Pricking, A; Pszczel, D; Pysz, K; Pyszniak, A; Redmer, C F; Ritman, J; Roy, A; Rudy, Z; Sawant, S; Schmidt, A; Schadmand, S; Sefzick, T; M Siemaszko; Siudak, R; Skorodko, T; Smyrski, J; Sopov, V; Stassen, R; Stepaniak, J; Stephan, E; Stockhorst, H; Ströher, H; Szczurek, A; Tolba, T; Trzciński, A; Varma, R; Wagner, G J; Węglorz, W; Wrońska, A; Wüstner, P; Wurm, P; Yamamoto, A; Yuan, X; Zabierowski, J; Zieliński, M J; Zipper, W; Złomańczuk, J; Żuprański, P; Żurek, M

    arXiv.org, 03/2014
    Paper

    An exclusive measurement of the dd -> 3He n \pi 0 reaction was carried at a beam momentum of p = 1.2 GeV/c using the WASA-at-COSY facility. For the first time data on the total cross section as well as differential distributions were obtained. The data are described with a phenomenological approach based on a combination of a quasi-free model and a partial wave expansion for three-body reaction. The total cross section is found to be \sigma(tot) = (2.89 +- 0.01(stat) +- 0.06(sys) +- 0.29(norm)) \mu b. The contribution of the quasi-free processes (with the neutron being target or beam spectator) accounts for 38% of the total cross section and dominates the differential distributions in specific regions of the phase space. The remaining part of the cross section can be described within a partial wave decomposition indicating the significance of p-wave contributions in the final state.

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