Measurement of the dead layer thickness in a p-type point contact germanium detector  

作　　者：江灏 岳骞 李玉兰 康克军 李元景 李金 林兴德 刘书魁 马豪 马菁露 苏健 王子敬 杨丽桃 赵伟 曾志 

机构地区：[1]Dept.of Engineering Physics, Tsinghua University [2]Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education [3]College of Physical Science and Technology, Sichuan University [4]Institute of Physics,Academia Sinica

出　　处：《Chinese Physics C》2016年第9期82-88,共7页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(10935005,10945002,11275107,11175099)

摘　　要：A 994 g mass p-type PCGe detector has been deployed during the first phase of the China Dark matter EXperiment, aiming at direct searches for light weakly interacting massive particles. Measuring the thickness of the dead layer of a p-type germanium detector is an issue of major importance since it determines the fiducial mass of the detector. This work reports a method using an uncollimated ^133Ba source to determine the dead layer thickness. The experimental design, data analysis and Monte Carlo simulation processes, as well as the statistical and systematic uncertainties are described. A dead layer thickness of 1.02 mm was obtained based on a comparison between the experimental data and the simulated results.A 994 g mass p-type PCGe detector has been deployed during the first phase of the China Dark matter EXperiment, aiming at direct searches for light weakly interacting massive particles. Measuring the thickness of the dead layer of a p-type germanium detector is an issue of major importance since it determines the fiducial mass of the detector. This work reports a method using an uncollimated ^133Ba source to determine the dead layer thickness. The experimental design, data analysis and Monte Carlo simulation processes, as well as the statistical and systematic uncertainties are described. A dead layer thickness of 1.02 mm was obtained based on a comparison between the experimental data and the simulated results.

关 键 词：dead layer CDEX PPCGe Monte Carlo 

分 类 号：O572.212[理学—粒子物理与原子核物理]