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ISSN - 05562813, EISSN - 1089490X, Physical Review C - Nuclear Physics, 1998, vol. 58, p. 2667-2670

Measurement of the quasifree pn → pn η reaction

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

The first measurement of the cross section of the quasifree pn→pn η reaction has been carried out at the CELSIUS storage ring using a deuterium internal cluster jet target. The energy dependence of the cross section is extracted using a fixed incident proton energy of Tp, = 1350 MeV and exploiting the Fermi momentum of the struck neutron. The data cover a range of center-of-mass excess energies from 16 to 109 MeV. The shape of the excitation function is broadly similar to that of the pp→pp η reaction, though with a cross section about a factor of 6.5 larger.