Background rejection in the DMTPC dark matter search using charge signals
Background rejection in the DMTPC dark matter search using charge signals
复制标题
使用电荷信号进行 DMTPC 暗物质搜索中的背景抑制
DOI:
10.1016/j.nima.2012.08.073
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
Lopez J
中科院分区:
文献类型:
--
作者:
Lopez J
The Dark Matter Time Projection Chamber (DMTPC) collaboration is developing a low pressure gas TPC for detecting Weakly Interacting Massive Particle (WIMP)-nucleon interactions. Optical readout with CCD cameras allows for the detection of the daily modulation of the direction of the dark matter wind. In order to reach sensitivities required for WIMP detection, the detector needs to minimize backgrounds from electron recoils. This paper demonstrates that a simplified CCD analysis achieves 7.3×10−5rejection of electron recoils while a charge analysis yields an electron rejection factor of 3.3×10−4for events with241Am-equivalent ionization energy loss between 40keV and 200keV. A combined charge and CCD analysis yields a background-limited upper limit of 1.1×10−5(90% confidence level) for the rejection of γ and electron events. Backgrounds from alpha decays from the field cage are eliminated by introducing a veto electrode that surrounds the sensitive region in the TPC. CCD-specific backgrounds are reduced more than two orders of magnitude when requiring a coincidence with the charge readout.
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发表时间:
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