Advanced focal plane detector with improved particle identification

A focal plane detector for a magnetic spectrograph was developed, which consists of two position counters, two energy-loss counters, and large-area silicon detectors. The energy, energy-loss and time-of-flight signals from this detector system depend on the particle incident angle into the counter and the position on the focal plane. Corrections to the angle and position dependence have improved the resolutions of these signals significantly and given unambiguous particle identification for studying reactions which have very small yields under intense backgrounds. The incident angle into the focal plane detector is found to be very useful to determine the scattering angle of reaction products. (author)