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ISSN - 03759474, Nuclear Physics A, 1999, vol. 654, p. 479c-482c

Recent results from the CELSIUS/WASA collaboration on meson production in proton-hydrogen collisions

Bilger R., Bondar A., Brodowski W., Calen H., Clement H., Dyring J., Ekström C., Fransson K., Gustafsson L., Häggström S., Höistad B., Johanson J., Johansson A., Johansson T., Kilian K., Kullander S., Kupsc A., Kuzmin A., Marciniewski P., Morosov B., Mörtsell A., Oelert W., Povtorejko A., Ruber R. J M Y, Schuberth U., Sefzick T., Sidorov V., Shwartz B., Sopov V., Stepaniak J., Sukhanov A., Tchernychev V., Turowiecki A., Wagner G., Wilhelmi Z., Zabierowski J., Zernov A., Zlomanczuk J.

Different π and η meson production channels in proton-proton and proton-deuteron collisions have been studied at the CELSIUS storage ring using an internal cluster-jet target setup [1]. During the last years more emphasis has been put on ππ and all but one of the possible channels in proton-proton collisions have been studied. Recently also the quasi-free p+n→d+η reaction cross section has been measured at threshold using 1295 MeV protons and target deuterium. Excess energies from threshold to 10 MeV in the center of mass of the final dη system were covered. Approaching the threshold the cross section is enhanced compared to phase-space expectations. This behaviour is typical for a strong final-state interaction.