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ISSN - 01689002, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001, vol. 457, p. 64-74

Spectator tagging in quasi-free proton-neutron interactions in deuterium using an internal cluster-jet target at a storage ring

Bilger R., Brodowski W., Calén H., Clement H., Dunin V., Dyring J., Ekström C., Fransson K., Greiff J., Gustafsson L., Höistad B., Johanson J., Johansson A., Johansson T., Kilian K., Koch I., Kullander S., Kupsc A., Marciniewski P., Morosov B., Neubauer T., Oelert W., Ruber R. J M Y, Shwartz B., Stepaniak J., Sukhanov A., Sundberg P., Turowiecki A., Wagner G. J., Wilhelmi Z., Wilkin C., Zabierowski J., Zlomańczuk J.

Low-energy spectator protons (ps) from quasi-free proton-neutron interactions on deuterium have been measured for the pd→dπ0ps and pd→pnπ0ps reactions at the CELSIUS storage ring of the The Svedberg Laboratory. The experiment used 320 MeV protons incident on a deuterium cluster-jet target. The spectator protons were detected inside the scattering chamber using a silicon detector system which is compatible with a high vacuum. The low target density allows the spectator proton emerge without undergoing significant secondary scattering. Its measurement is therefore a useful tag upon such reactions, allowing cross-sections for quasi-free reactions to be deduced at well-defined centre-of-mass energies. The comparison with the simulation for the pd→dπ0ps reaction shows that the energy dependence of the pn→dπ0 cross-section can be extracted near the threshold. The method greatly improves the experimental resolution achievable in quasi-free p-n reaction studies.