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

M. Nekipelov; M. Buescher; W. Cassing; M. Hartmann; V. Hejny; V. Kleber; H. R. Koch; V. Koptev; Y. Maeda; R. Maier; S. Merzliakov; S. Mikirtychiants; H. Ohm; A. Petrus; D. Prasuhn; F. Rathmann; Z. Rudy; R. Schleichert; H. Schneider; K. Sistemich; H. J. Stein; H. Stroeher; K. -H. Watzlawik; C. Wilkin

doi:10.1016/s0370-2693(02)02176-7

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

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Abstract

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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M. Nekipelov, M. Buescher, W. Cassing, M. Hartmann, V. Hejny, V. Kleber, H. R. Koch, V. Koptev, Y. Maeda, R. Maier, S. Merzliakov, S. Mikirtychiants, H. Ohm, A. Petrus, D. Prasuhn, F. Rathmann, Z. Rudy, R. Schleichert, H. Schneider, K. Sistemich, H. J. Stein, H. Stroeher, K. -H. Watzlawik, C. Wilkin. 2002-05-17. Evidence of kaon nuclear and Coulomb potential effects on soft K+ production from nuclei. https://doi.org/10.1016/s0370-2693(02)02176-7

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