横向场电离室在RIBLL实验中的应用

A Transverse Field Gas Ionization Chamber Performed at RIBLL

描述一种可用于兰州放射性束流线(RIBLL)上的ΔE探测器——横向场气体电离室．对其性能进行了测试,包括它的坪曲线、探测效率和能量分辨．测试结果显示,在混合气Ar(80％)+CO2(20％)的不同气压下,此电离室具有较长的工作坪区,较小的坪斜．相对于Si的探测效率为99．31％．在118mbar的气压下,对能损为4．94MeV的α粒子,其能量分辨率为3．25％．并在RIBLL上利用50MeV／u的58Ni轰击Ta靶的实验中进行了在束应用．

A transverse field gas ionization chamber as △E detector at the Radioactive Ion Beam Line in Lanzhou （RIBLL） is described. A high detection efficiency and long plateau ave achieved with the mixed gas Ar（80%）＋CO2 （20%）. The energy resolution is 3.25% for 4.94MeV α particle. This ionization chamber has been tested in the experiment with 50MeV/u 5SNi bombarding Ta at RIBLL. All the fragments can be identified clearly by the ionization chamber.