Evidence of kaon nuclear and Coulomb potential effects on soft K+ production from nuclei

Details Evidence of kaon nuclear and Coulomb potential effects on soft K+ production from nuclei Evidence of kaon nuclear and Coulomb potential effects on soft K+ production from nuclei

2002-02-26

arxiv.org/abs/nucl-ex/0202021v2

Phys.Lett.B540:207-212,2002

Physics

Nuclear Physics

Nuclear Experiment

9 pages, 3 figures; changed content

Scientific paper

10.1016/S0370-2693(02)02176-7

The ratio of forward K+ production on copper, silver and gold targets to that on carbon has been measured at proton beam energies between 1.5 and 2.3 GeV as a function of the kaon momentum p_K using the ANKE spectrometer at COSY-Juelich. The strong suppression in the ratios observed for p_K<200-250 MeV/c can be ascribed to a combination of Coulomb and nuclear repulsion in the K+A system. This opens a new way to investigate the interaction of K+-mesons in the nuclear medium. Our data are consistent with a K+A nuclear potential of V_K~20 MeV at low kaon momenta and normal nuclear density. Given the sensitivity of the data to the kaon potential, the current experimental precision might allow one to determine V_K to better than 3 MeV.

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