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描述了一种用于RIBLL粒子鉴别的阳极分别在X、Y方向分条 ,共用阴极 ,纵向场双叠层气体电离室的结构和工作原理。用 3组分α源对电离室进行能量刻度得到其相对能量分辨对2 4 1Amα源约为 3.4 9%。通过在RIBLL上测量 80MeV/u2 0Ne +58Ni反应次级产物碎片 ,得到ΔE与TOF两维分布图 ,并根据粒子鉴别原理测得A/Z =2时的Z分布和Ne、O、N、C的同位素分布。
The structure and working principle of a gas ionization chamber with a double cathode and a vertical field stacked in the X and Y directions are described respectively for an anode for RIBLL particle identification. The relative energy resolution of the ionization chamber with the 3-component α source was about 3.4 9% for the 2 4 1Amα source. The two-dimensional distributions of ΔE and TOF were obtained by measuring 80MeV / u 2 0Ne + 58Ni reaction secondary product fragments on RIBLL, and Z distribution and Ne, O, N, C at A / Z = 2 were measured according to particle identification theory Isotope distribution.