Study of the low-energy ER/NR discrimination and its electric-field dependence with liquid argon
Study of the low-energy ER/NR discrimination and its electric-field dependence with liquid argon
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DOI：
10.1088/1748-0221/13/02/c02026
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发表时间：
2018-02
影响因子：
1.3
通讯作者：
T. Washimi;T. Kikuchi;M. Kimura;M. Tanaka;K. Yorita
中科院分区：
文献类型：
--
作者：
T. Washimi;T. Kikuchi;M. Kimura;M. Tanaka;K. Yorita
由于两相氩探测器对电子反冲背景事件具有较高的抑制能力，因此通常适用于直接探测弱相互作用大质量粒子（WIMP）暗物质。然而，与氙相比，电离信号（S2）在低能区的基本性质和识别能力尚不清楚，因此在目前的实验中还没有有效地用于氩。本研究的范围是基于原型LAr时间投影室的结果，评估S2在约40 keVnr的低能区域的性能及其对电子后坐力和核后坐力的辨别能力。漂场变化范围为0 ~ 3kv /cm。讨论了用氩气探测低质量WIMP的可行性。
A two-phase argon detector is generally suitable for the direct detection of weakly interacting massive particle (WIMP) dark matter owing to its high rejection power against electron recoil background events. However, ionization signal (S2) has not been effectively used for argon in current experiments because its basic properties and discrimination power from S2 signal in the low-energy region are not well known, as compared with xenon. The scope of this study is evaluation of S2 properties at a low-energy region of about 40 keVnr and its discrimination power between electron recoils and nuclear recoils based on results from a prototype LAr time projection chamber. The drift-field was varied from null to 3 kV/cm. The detection feasibility for low-mass WIMP with argon is also discussed.