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  • Proton-Proton Correlations in Central Collisions of Ni+Ni at 1.93 A GeV and the Space-Time Extent of the Emission Source
    Kirejczyk, M; Siwek-Wilczynska, K; Sodan, U; Schüll, D; Maazouzi, C; Vasiliev, M. A; Alard, J. P; Guillaume, G; Ritman, J. L; Kotte, Roland; Bastid, N; Hong, B; Zhilin, A; Wohlfarth, Dietrich; Best, D; Crochet, P; Neubert, W; Merlitz, H; Kuhn, C; Wagner, P; Kecskemeti, J; Biegansky, J; Korolija, M; Gobbi, A; Leifels, Y; Dzelalija, M; Dona, R; Legrand, I; Lebedev, A; Somov, A; Wienold, T; Petrovici, M; Fodor, Z; Sikora, B; Wang, G. S; Pinkenburg, C; Häfele, E; Fintz, P; Basrak, Z; Herrmann, N; Yatsunenko, Y; Göbels, G; Roy, C; Hölbling, S; Mösner, Jürgen; Belyaev, I; Seres, Z; Eskef, M; Berek, G; Rami, F; Fraysse, L; Simion, V; Pelte, D; Tizniti, L; Hildenbrand, K. D; Jundt, F; Dupieux, P; Pras, P; Buta, A; Reisdorf, W; Caplar, R; Genoux-Lubain, A; Amouroux, V; Mohren, S; Manko, V; Plettner, Christoph; Cindro, N; Trzaska, M; Coffin, J. P

    Dissertation

    Small-angle correlations of Proton pairs produced in central Ni+Ni collisions at a beam energy of 1.93 AGeV are investigated with the FOPI detector System at GSI Darmstadt. A well-defined emission source is selected by triggering on central events which comprise about 8% of the total cross section. Simultaneous comparison of longitudinal and transverse correlation functions with the predictions of the Koonin model allows to unravel the space-time ambiguity of the emission process. Taking into account the strong collactive expansion of the participant zone, which introduces a reduction of the extracted source radius of more than 30% r.m.s. radius and emission time parameters of Rrms = ( 4.2 ± 1.2) fm and trms = (11+7-5) fm/c are extracted, respectively. In contrast, the analysis of the angle-integrated correlation function gives an upper limit Rrms = (7.0 ± 1.4) fm of the source radius.

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