101. Observation of strong final-state effects in pi+ production in pp collisions at 400 MeV
- Author
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Betsch, A., Bilger, R., Brodowski, W., Calen, H., Clement, H., Dyring, J., Ekstrom, C., Fransson, K., Gustafsson, L., Haggstrom, S., Hoistad, B., Johanson, J., Johansson, A., Johansson, T., Kilian, K., Kullander, S., Kupsc, A., Kurz, G., Marciniewski, P., Morosov, B., Mortsell, A., Oelert, W., Ruber, R. J. M. Y., Schepkin, M. G., Stepaniak, J., Sukhanov, A., Turowiecki, A., Wagner, G. J., Wilhelmi, Z., Zabierowski, J., Zernov, A., and Zlomanczuk, J.
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Nuclear Experiment - Abstract
Differential cross sections of the reactions $pp \to d\pi^+$ and $pp \to pn\pi^+$ have been measured at $T_p = 400$ MeV by detecting the charged ejectiles in the angular range $4^0 \leq \Theta_{Lab} \leq 21^\circ$. 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 $\Delta$ production and $NN$ final-state interaction. The data are well described by Monte Carlo simulations including both these effects. The ratio of $pp \to pn\pi^+$ and $pp \to d\pi^+$ cross sections also compares favourably to a recent theoretical prediction which suggests a dominance of $np$-production in the relative $^3S_1$-state., Comment: 17 pages, 5 figures
- Published
- 1998
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