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Phys. Rev. C 79, 018201 (2009) [4 pages]

Measurement of the pn→dK+K- total cross section close to threshold

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Y. Maeda1,*, M. Hartmann2,3,†, I. Keshelashvili4, S. Barsov5, M. Büscher2,3, A. Dzyuba5, S. Dymov6,7, V. Hejny2,3, A. Kacharava2,3, V. Kleber8, V. Koptev5, P. Kulessa9, T. Mersmann10, S. Mikirtytchiants2,3,5, A. Mussgiller7, M. Nekipelov2,3, H. Ohm2,3, K. Pysz9, H. J. Stein2,3, H. Ströher2,3, Yu. Valdau5, C. Wilkin11, and P. Wüstner12
1Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
2Institut für Kernphysik, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
3Jülich Centre for Hadron Physics, D-52425 Jülich, Germany
4Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
5High Energy Physics Department, Petersburg Nuclear Physics Institute, RU-188350 Gatchina, Russia
6Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
7Physikalisches Institut II, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
8Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany
9H. Niewodniczański Institute of Nuclear Physics PAN, PL-31342 Kraków, Poland
10Institut für Kernphysik, Universität Münster, D-48149 Münster, Germany
11Physics and Astronomy Department, UCL, Gower Street, London WC1E 6BT, United Kingdom
12Zentralinstitut für Elektronik, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

Received 26 November 2008; published 29 January 2009

Measurements of the pd→pspdK+K- reaction, where psp is a spectator proton, have been undertaken at the Cooler Synchrotron COSY-Jülich by detecting a fast deuteron in coincidence with a K+K- pair in the ANKE facility. Although the proton beam energy was fixed, the moving target neutron allowed values of the nonresonant quasifree pn→dK+K- total cross section to be deduced up to an excess energy ε≈100 MeV. Evidence is found for the effects of K-d and KK̅ final state interactions. The comparison of these data with those of pp→ppK+K- and pp→dK+K̅ 0 shows that all the total cross sections are very similar in magnitude.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.79.018201
DOI:
10.1103/PhysRevC.79.018201
PACS:
25.40.Ve, 13.75.Cs, 14.40.Cs
 
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