分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2017-11-10
摘要: The radioactive noble gas 222Rn, which can be dissolved in water, is an important background source for JUNO. In this paper, based on the water system of JUNO prototype, two kinds of high sensitivity radon detectors have been proposed and validated. The sensitivity of Si-PIN Rn detector, which uses Si-PIN photodiode to detect the -214Po, is 4.2 mBq/m3 and the sensitivity of LS Rn detector, which uses liquid scintillator to detect the coincident signals of -214Bi and -214Po, is 34.4 mBq/m3. Both of the two kinds of Rn detector have the potential to be developped into an online Rn concentration monitoring equipment for JUNO veto detector.
分类: 物理学 >> 核物理学 提交时间: 2016-08-31
摘要: In recent decades, inorganic crystals have been widely used in dark matter direct search experiments. To contribute to the understanding of the capabilities of CsI(Na) and CaF2(Eu) crystals, a mono-energetic neutron beam is utilized to study the properties of nuclear recoils, which are expected to be similar to signals of dark matter direct detection. The quenching factor of nuclear recoils in CsI(Na) and CaF2(Eu), as well as an improved discrimination factor between nuclear recoils and γ backgrounds in CsI(Na), are reported.