Freiburg 1999 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 28: Instrumentation und Anwendungen IV
HK 28.4: Talk
Tuesday, March 23, 1999, 18:00–18:15, F
Procedure of K+-identification at ANKE — •H. Junghans — Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich
First experiments at the spectrometer ANKE, which has recently been installed
in the COSY-accelerator ring, investigated
the subthreshold production of K+-mesons in proton-carbon collisions at
projectile energies below the free NN threshold. The subthreshold K+
production is a rare process which occurs in the presence of an up to 106
times more intense background of protons and pions. Therefore a rapid data acquisition
system which allows to store data with a speed of 2 MByte/s and a very
efficient data analysis based on Linux-PCs have been developed.
The suppression of the background is achieved in two steps:
first the time and amplitude information of the scintillation detectors is used for
a rough separation between kaons and background stemming from the
target. In the second step the position information of
the multiwire proportional chambers is applied to reject the particles which
do not originate from the target and to determine the momentum of the
ejectiles stemming from the target.
Supported by: BMBF, DFG, Verbundforschung, WTZ, State of North Rhine-Westphalia, INTAS, Polish Committee for Scientific Research, RFFI, RFNP, Russian Academy of Sciences, Russian Ministry of Sciences