ISSN - 05874254, Acta Physica Polonica, Series B., 1998, vol. 29, p. 3141-3148
Near-threshold pion production inpN collisions at CELSIUS
The pp → ppπ0 and pn → ppπ- reactions have been measured at 310, 320 and 340 MeV using the CELSIUS proton beam and 1E and 2H internal cluster-jet targets. The π0 production at 310 MeV has been fully analyzed and a significant deviation from isotropy found in the pion angular distributions. This increases at small excitation energies of the final proton pair, suggesting that d-wave pion production is important even close to threshold. Evidence is also found for some P-wave excitation in the final p-p system.