arXiv · nucl-ex/9810009
Observation of strong final-state effects in pi+ production in pp collisions at 400 MeV
Abstract
Differential cross sections of the reactions $pp \to dπ^+$ and $pp \to pnπ^+$ have been measured at $T_p = 400$ MeV by detecting the charged ejectiles in the angular range $4^0 \leq Θ_{Lab} \leq 21^\circ$. The deduced total cross sections agree well with those published previously for neighbouring energies. The invariant mass spectra are observed to be strongly affected by $Δ$ production and $NN$ final-state interaction. The data are well described by Monte Carlo simulations including both these effects. The ratio of $pp \to pnπ^+$ and $pp \to dπ^+$ cross sections also compares favourably to a recent theoretical prediction which suggests a dominance of $np$-production in the relative $^3S_1$-state.
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A. Betsch, R. Bilger, W. Brodowski, H. Calen, H. Clement, J. Dyring, C. Ekstrom, K. Fransson, L. Gustafsson, S. Haggstrom, B. Hoistad, J. Johanson, A. Johansson, T. Johansson, K. Kilian, S. Kullander, A. Kupsc, G. Kurz, P. Marciniewski, B. Morosov, A. Mortsell, W. Oelert, R. J. M. Y. Ruber, M. G. Schepkin, J. Stepaniak, A. Sukhanov, A. Turowiecki, G. J. Wagner, Z. Wilhelmi, J. Zabierowski, A. Zernov, J. Zlomanczuk. 1998-10-13. Observation of strong final-state effects in pi+ production in pp collisions at 400 MeV. https://doi.org/10.1016/s0370-2693(98)01524-x
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