中文摘要：

由28＋多气隙电阻板室（MRPC）模块组成的探测阵列-STAR／TOFr，在相对论重离子对撞机（PHIC）实验上获得了大量的数据．利用质心能量62．4GeV Au＋Au对撞的实验数据，分析了MRPC探测不同带电粒子（K介子、π介子、质子等）时的输出信号与气体中的电离能损（dE／dx）之间的关系，给出了MRPC的气体电离和雪崩放大一些新的实验结果．为了进一步解释实验结果，针对工作条件下MRPC输出信号的特点，对MRPC的气体电离和雪崩过程进行Monte Carlo模拟，深入探讨了影响MRPC输出信号幅度的原因．

英文摘要：

Based on analysis of STAR-TOFr data from RHIC 62.4GeV Au＋Au experiments, correlation between the MRPC signal amplitude （ADC） and the ionization energy loss （dE/dx） in working gas, for different particles （Pion, Kaon, Proton）, are studied. Experimental results on characteristics of particle ionization and avalanche process in MRPC are presented. In order to further understand the working mechanism of MRPC, a Monte Carlo simulation procedure is carried out. Possible factors contributing to the performance of MRPC are discussed.