Light-heavy ion focal plane detector system for Q3D spectrometer

摘要

A light-heavy ion focal plane detector system (500 mm in length) has been developed for the Beijing Q3D magnetic spectrometer. It has passed in-beam test and is already in use in nuclear physical experiments. The telescope of this detector system consists of 4 rectangular proportional counters and an ionization chamber. The working gas is 70% Ar + 30% CH(sub 4). The desk experiment shows that the intrinsic resolution of the position-sensitive detector is about 0.95 mm and the integrated nonlinearity is better than 0.2%. The HI-13 tandem accelerator of China Institute of Atomic Energy experiment shows under the pressure of 0.33 x 10(sup 5) Pa with 66 MeV (sup 12)C beam, the intrinsic position resolution has been measured to be about 1.3 mm, and the energy resolutions for the energy loss (Delta)E, the residual energy E(sub r) and the total energy E have been measured to be 5.6%, 7.1% and 3.7%, respectively. (sup 27)Al ((sup 12)C, X) reaction is used to study particle identification and it is found that (sup 13)C and (sup 12)C can be separated completely. (7 figs., 2 tabs.). (Atomindex citation 27:063217)