A Monte Carlo study for the shielding of <EM>γ</EM> backgrounds induced by radionuclides for CDEX

LI Lei; YUE Qian; TANG Chang-Jian; CHENG Jian-Ping; KANG Ke-Jun; LI Jian-Min; LI Jin; LI Yu-Lan; LI Yuan-Jing; MA Hao; XUE Tao; ZENG Zhi

doi:10.1088/1674-1137/35/3/013

Chinese Physics C> 2011, Vol. 35> Issue(3) : 282-287 DOI: 10.1088/1674-1137/35/3/013

A Monte Carlo study for the shielding of γ backgrounds induced by radionuclides for CDEX

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Abstract：
The CDEX (China Dark matter EXperiment) Collaboration will carry out a direct search for WIMPs (Weakly Interacting Massive Particles) using an Ultra-Low Energy Threshold High Purity Germanium (ULE-HPGe) detector at the CJPL (China JinPing deep underground Laboratory). A complex shielding system was designed to reduce backgrounds and a detailed GEANT4 Monte Carlo simulation was performed to study the achievable reduction of γ rays induced by radionuclides and neutron backgrounds by D(γ,n)p reaction. Furthermore, the upper level of allowed radiopurity of shielding materials was estimated under the constraint of the expected goal. Compared with the radiopurity reported by other low-background rare-event experiments, it indicates that the shielding used in the CDEX can be made out of materials with obtainable radiopurity.

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LI Lei, YUE Qian, TANG Chang-Jian, CHENG Jian-Ping, KANG Ke-Jun, LI Jian-Min, LI Jin, LI Yu-Lan, LI Yuan-Jing, MA Hao, XUE Tao, ZENG Zhi and A Monte Carlo study for the shielding of γ backgrounds induced by radionuclides for CDEX[J]. Chinese Physics C, 2011, 35(3): 282-287. doi: 10.1088/1674-1137/35/3/013

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Received: 2010-06-21
Revised: 2010-11-05

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沈阳化工大学材料科学与工程学院沈阳 110142

A Monte Carlo study for the shielding of γ backgrounds induced by radionuclides for CDEX

Received Date: 2010-06-21
Accepted Date: 2010-11-05
Available Online: 2011-03-05

Abstract: The CDEX (China Dark matter EXperiment) Collaboration will carry out a direct search for WIMPs (Weakly Interacting Massive Particles) using an Ultra-Low Energy Threshold High Purity Germanium (ULE-HPGe) detector at the CJPL (China JinPing deep underground Laboratory). A complex shielding system was designed to reduce backgrounds and a detailed GEANT4 Monte Carlo simulation was performed to study the achievable reduction of γ rays induced by radionuclides and neutron backgrounds by D(γ,n)p reaction. Furthermore, the upper level of allowed radiopurity of shielding materials was estimated under the constraint of the expected goal. Compared with the radiopurity reported by other low-background rare-event experiments, it indicates that the shielding used in the CDEX can be made out of materials with obtainable radiopurity.