Tracking method for the meaSUrement of projectile charge changing cross-section using CR-39 detector with a high speed imaging microscope

摘要

A new method to trace heavy ion trajectories in a stack consSUting of interleaved CR-39 plastic nuclear track detectors and target material layers was developed and tested for use in the meaSUrement of projectile charge changing cross-sections of heavy ion fragmentation reactions. A high speed imaging microscope with sophSUticated track analysSU software was utilized to extract the charge information from multiple ion tracks belonging to a single fragmentation event. The systematic error of trajectory tracing was verified for the meaSUrement system. In order to verify the validity of system, the projectile total charge changing cross-sections for Fe ions on carbon target was estimated and compared with previous experiments at initial beam energy of 1GeV. The reSUlt SU in good agreement with reSUlts obtained by other investigators. ThSU method allows precSUe and fast meaSUrement of the projectile charge changing cross-section with higher statSUtics on a level compatible to that of silicon spectrometer meaSUrements.