探测丰中子核弱γ活性的符合反符合系统  

A coincidence-anticoincidence system for detecting γ rays from weak activity neutron-rich nuclei

作　　者：张立[1] 王积成[1] 赵进华[1] 杨永峰[1] 郑继文[1] 秦芝[1] 张纯[1] 郭天瑞[1] 胡青元[1] 

机构地区：[1]中国科学院近代物理研究所,兰州730000

出　　处：《核技术》2002年第3期173-178,共6页Nuclear Techniques

基　　金：国家自然科学基金 (19975 0 5 8;195 75 0 6 5 );中国科学院重大课题(KJ95T - 0 3)资助

摘　　要：HPGeγ探测器的γ射线能量信号与 4πΔEβ 探测器的 β射线能损信号相符合 ,再与大的BGO探测的正电子湮灭 5 11keVγ射线信号作反符合 ,由此构成的特殊探测系统在新丰中子核素2 0 9Hg的首次观察中起到了重要作用 。ray signals detected by a HPGe detector were coincided with β-ray signals detected by a 4πΔ E β detector, and anticoincided with 511keV γ-ray from positron annihilation detected by a large BGO detector. This special coincident-anticoincident system was proved to be very successful in suppressing interfering γ- and β- rays emitted from β-deficient siotpes, and has played an important role in the obervation of the new neutron-rich nuclide 209 Hg.

关 键 词：同位素 特征γ射线 Β衰变 γ活性 EC衰 变 正电子湮灭 符合 反符合 康普顿本底 探测效率 丰中子核 HPGer探测器 

分 类 号：O571.3[理学—粒子物理与原子核物理] O571.1[理学—物理]