Measurement of the real part of the K-n forward scattering amplitude between 1.2 and 2.6 GeV/c

The differential cross sections of the combined elastic and break-up K-d reaction have been measured at 1.21, 1.42 and 2.61 GeV/c incident K-momentum. The measurements have been performed at the CERN PS using multiwire proportional chambers. The values of the invariant momentum transfer t explored (0.0005<mod(t)<0.1 GeV2) include the Coulomb-nuclear interference region. The differential cross sections have been analysed in the framework of the Glauber impact-parameter formalism. The observed interference effects have been used to derive the ratio of the real to imaginery part of the forward K-n nuclear amplitude. (Auth.)