First results from subthreshold K+ production measurements with ANKE
First results from subthreshold K+ production measurements with ANKE
Barsov, S.; Bechstedt, U.; Borchert, G.; Borgs, W.; Büscher, M.; Debowski, M.; Drochner, M.; Erven, W.; Eüer, R.; Fedorets, P.; Gotta, D.; Hartmann, M.; Junghans, H.; Kacharava, A.; Kamys, B.; Klehr, F.; Koch, H. R.; Komarov, V. I.; Koptev, V.; Kulessa, P.; Kulikov, A.; Kurbatov, V.; Macharashvili, G.; Maier, R.; Mikirtichyants, S.; Merzliakov, S.; Müller, H.; Mussgiler, A.; Nioradze, M.; Ohm, H.; Petrus, A.; Prasuhn, D.; Pysz, K.; Rathmann, F.; Rimarzig, B.; Rudy, Z.; Schleichert, R.; Schneider, C.; Schult, O. W. B.; Seyfahrt, H.; Sistemich, K.; Stein, H. J.; Ströher, H.; Wüstner, P.
The new spectrometer ANKE has been put into operation at the accelerator COSY of the Forschungszentrum Jfilich. 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 π+ and μ+ is exploited as well as the track information from the wire chambers.
- Nucl. Phys. A675 (2000) 230c-233c
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