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Experimental Study on Quenching Factor of Recoiled Nucleus of Low Energy Threshold HPGe Detector

Author: FangBinBin
Tutor: LiYuanJing
School: Tsinghua University
Course: Nuclear Science and Technology
Keywords: WIMP Inhibitory factor VME bus VxWorks
CLC: O572.212
Type: Master's thesis
Year: 2008
Downloads: 89
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Abstract

The study of dark matter is one of the hot spots of the physics community today. Now we know that dark matter is an important part of the universe. Dark matter dominated the formation of the structure of the universe. The nature of dark matter remains a mystery, but in many theoretical models, the weak interaction The WIMP of heavy particles is one of the most likely candidate particles. WIMP particles can be detected by scattering effect occurs with a particular target nucleus, but the determination of some important physical parameters, such as the incident energy, the recoil nuclei energy interaction cross section, etc., need to measure and study detector for recoil weight nuclear stories and examples of recoil electron response, that recoil measuring nuclear inhibitor (Quenching Factor). Germanium nuclear recoil generated by the incident dark matter particles of this paper the use of neutron induced recoil germanium nuclear bombardment of high-purity germanium detector simulation to study the low-energy threshold germanium nuclear recoil in high-purity germanium detector inhibitory factor important parameters, and that will be carried out by the use of very low energy threshold of high-purity germanium detector to measure energy less than the the 1keV case recoil nuclear suppression factor experimental feasibility analysis assessment. This work was applied to the core of high-speed Motorola VME bus controller of the Company MVME5100 VME bus data acquisition system. MVME5100 running on the embedded real-time operating system VxWorks, each task is responsible for hardware programming, real-time scheduling. MVME5100 hardware high-speed, coupled with the outstanding performance of VxWorks embedded real-time operating system, to ensure that the data acquisition time response, the demand for data transmission speed. This article details the MVME5100 and VxWorks operating system to establish data acquisition software platform. In this study, the completion of the China Institute of Atomic Energy, HI-13 tandem accelerator neutron beam. Using ~~ 1H (to 7Li, n) to 7Be reaction produce the pulsed neutron beam incident on the high-purity germanium detectors, these neutrons by elastic scattering interactions with germanium nucleus is scattered to different angles on the neutron detectors are detected. Neutron scattering angle can be screened out of the bottom and the noise signal and the flight time, and determine the energy of the recoil germanium core. The data acquisition system neutron detectors and high-purity germanium detector signal is recorded for off-line data analysis and physical analysis. In the last part of the thesis, given the experimental recoil nucleus inhibitory factor experimental measurements and calculated results were compared with the other results of the existing international and TRIM98 theory. The results show that: the success of the experiment measured recoil energy 3keV more energy interval germanium nuclear inhibitor, and the next step will be to lower energy range recoil germanium nuclear suppression factor measurement experimental design provides a very valuable experimental data and experience. 1keV energy range of recoil Next lower than germanium nuclear suppression factor measurement experiment based on experimental data and experience, recommendations and outlook.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle physics > Experiments and determination > Detector and detection method
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