联合在束γ装置的实验测量

EXPERIMENTS OF JOINED IN-BEAM γ EQUIPMENT

构成联合在束γ实验装置的四套带有对称型和六套带有非对称型BGO康普顿抑制的高纯锗探测器装置,已分别在北京中国原子能科学研究院和兰州中国科学院近代物理研究所完成研制测试.用该联合装置最近进行了首批在束实验.本文着重对实验装置、实验测量的一般情况以及康普顿抑制性能做了讨论.对^(121)Cs测到的25/2^+是目前Cs各同位素中带头为9/2^+(1g9/2质子空穴态),△J=1级联中自旋最高的能级.

4 symmetric and 6 asymmetric BGO Compton shielded HpGe detectors which constitute the Joined In-Beam Gamma Equipment have been completed and measured at the Institute of Atomic Energy (Beijing) and Institute of Modern Physics (Lanzhou) respectively. The first set of experiments has been carried out by using the equipment. This paper describes the experimental set up and the general case of the measurements. A discussion about the Compton suppression is given. The observed 25/2^+ of the △J=1 band built on the 9/2^+ (lg 9/2 proton hole) state of ^(121)Cs is the highest level among the similar bands of other Cs isotopes.