Measurements of the pn -> p_spec dK^+K^- reaction, where p_spec is a spectator proton, have been undertaken at the Cooler Synchrotron COSY-Juelich 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 non-resonant quasi-free pn -> dK^+K^- total cross section to be deduced up to an excess energy epsilon ~ 100 MeV. Evidence is found for the effects of K^-d and KKbar final state interactions. The comparison of these data with those of pp -> ppK^+K^- and pp -> dK^+Kbar shows that all the total cross sections are very similar in magnitude.
@article{arxiv.0811.4303,
title = {Measurement of the pn -> dK^+K^- total cross section close to threshold},
author = {Y. Maeda and M. Hartmann and I. Keshelashvili and S. Barsov and M. Buescher and A. Dzyuba and S. Dymov and V. Hejny and A. Kacharava and V. Kleber and V. Koptev and P. Kulessa and T. Mersmann and S. Mikirtytchiants and A. Mussgiller and M. Nekipelov and H. Ohm and K. Pysz and H. J. Stein and H. Stroeher and Yu. Valdau and C. Wilkin and P. Wuestner},
journal= {arXiv preprint arXiv:0811.4303},
year = {2009}
}