Abstract
Central collisions of 32S and 16O with Pb at 200 GeV amu have been studied by the emulsion spectrometer in the CERN-EMU05 experiment. The emission angles, momenta and charge signs of the secondary particles are measured. The position of a track in an emulsion plate should be measured by using a microscope to determine the momenta of more than 500 charged secondaries in an event. A new coordinate measurement system has been developed by using a video image processor connected to the microscope. In this system, the position, direction and length of a track in a coated emulsion are expressed as a vector which is linked with the motion of micro X- Y stage and is superimposed on an emulsion image on a TV monitor. By using this system, the data acquisition rate has become about ten times faster than that by using only an emulsion image and the momentum resolution has become higher than that. Moreover, this system is effective for identifying tracks emitted in more than 45°.
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