Author/Authors :
S. Barsov، نويسنده , , U Bechstedt، نويسنده , , G Borchert، نويسنده , , W. Borgs، نويسنده , , M Büscher، نويسنده , , M Debowski، نويسنده , , M Drochner، نويسنده , , W Erven، نويسنده , , R E?er، نويسنده , , P. Fedorets، نويسنده , , D Gotta، نويسنده , , M Hartmann، نويسنده , , H Junghans، نويسنده , , A Kacharava، نويسنده , , B. Kamys، نويسنده , , F Klehr، نويسنده , , H.R. Koch، نويسنده , , V.I. Komarov، نويسنده , , V Koptev، نويسنده , , P Kulessa، نويسنده , , et al.، نويسنده ,
Abstract :
The new spectrometer ANKE has been put into operation at the accelerator COSY of the Forschungszentrum Jülich. An initial scientific goal is to study K+-production in pA collisions at subthreshold energies below the free NN-threshold of T = 1.58 GeV. First measurements of double differential cross sections in p12C collisions at emission angles around 0° have been performed at T = 1.0, 1.2 and 2.0 GeV. The challenge is to identify the kaons in a huge background of pions and protons, since the signal to background ratio decreases to about 10−6 at T = 1.0 GeV. For background suppression detectors and a trigger system based on energy-loss and time-of-flight measurements have been developed. In the analysis the decay of kaons (τ = 12.4 ns) stopped in the detection system into μ+ and π+ is exploited as well as the track information from the wire chambers.
