Construction of an ''intelligent'' trigger system for kaons and study of the K+ production in the system Ne+NaF at 1.0 GeV/u

The technical part of this thesis describes the construction, the properties, and the experience from the application of an intelligent software trigger for the experiments on the production of positive kaons at the kaon spectrometer. The software trigger was applied in several beam-times. An essiential improvement in the yield of the registrated kaons was reached. The realization ensued by the application of standard components and represents a flexible and cost-efficient solution. The physical part of this thesis deals with the measurement of the double-differential cross section for positive kaons, positive pions, and protons in the system Ne+NaF at 1.0 GeV/u beam energy in the laboratory-angle range ofΘlab=44 ±4 . the beam energy of 1.0 GeV/u lies below the threshold energy for the production of positive kaons in the collision of two free nucleons of Ebeamthreshold=1.58 GeV. The momentum spectra of kaons and pions in the laboratory-momentum range from 270 MeV/c to 1140 MeV/c can be well described by a Boltzmann distribution in the c. m. system. The steepness parameter of the Boltzmann distributions amount to 64 MeV for kaons and 58 MeV for pions. The momentum-integrates cross section were determined from the extrapolation of the fitted Boltzmann distributions to: (dσ/dΩlab)ΔΩlabK+=58.6±9.2 μb/sr and (dσ/dΩlab)ΔΩlabπ+=169±17 mb/sr. The total cross sections were calculated under the assumption of the isotropy in the c. m. system from the fitted distributions: σ0K+=335±52 μb and σ0π+=939±96 mb. The mass dependence of the meson production cross sections in the symmetrc collisional system Ne+NaF was studied and compared with the results of the study of the heavy collisional system Au+Au