A ΔE-E Telescope with lonization Chamber Used in Excitation Function Measurement

查看全文 作　　者：Li Songlin, Wang Qi, Dong Yuchuan, Xu Huagen and Chen Ruofu 出　　处：《近代物理研究所和兰州重离子加速器实验室年报:英文版》索引2003年第1期,共1页 摘　　要：A thorough study of excitation function in dissipative heavy ion collision requires the identification of the nuclear charge number Z of the reaction products. For this purpose, a special designed ΔE-E telescope is employed, which consists of a gas filled ionization chamber to detect the energy loss and a position sensitive semiconductor Si detector (300μm in thickness and 8 mm×45 mm in active area) as the residual energy detector. The ionization chamber with a sensitive length of about 60 mm, is divided into two parts of ΔE1 and ΔE2, each with length of 30 mm. The trajectory of the incident particles is parallel to the direction of the electric field in the ionization chamber. The anodes of ΔE1 and ΔE2 are realized through the rectangular empty metallic frames. In order to collect ionized charge produced by the incident particle inside the ionization chamber effectively, two equipotential frame-shape electrodes were placed on both sides of each anode, to form a strong electric focused field toward the anode. The advantages of this type of the detector arc as follows: (1)lower energy detection threshold; (2) wide dynamical range both for the light particles and the heavy fragments;(3) larger solid angle coverage with a relatively smaller detector size based on the position information from the Si detector. 关 键 词：离子膛 望远镜 激发函数 测量方法 能量损失 硅半导体 原子碰撞