Abstract
The spectrometer ANKE has been put into operation at the accelerator COSY of the Forschungszentrum Jülich in spring 1998. An initial scientific goal is to study K +-production in pA collisions at subthreshold energies far below the free NN-threshold at T p=1.58 GeV. This requires the identification of K +-mesons in a background of pions and protons, about 10 6 times more intense. In this paper the sophisticated detection system and the software procedures for kaon identification are described. With the help of TOF, energy-loss and range measurements as well as the track information from wire chambers, it is possible to measure d 2σ/ dΩ dp for deep subthreshold K + production at beam energies down to T p=1.0 GeV.
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