Measurement of the liquid argon energy response to nuclear and electronic recoils
Measurement of the liquid argon energy response to nuclear and electronic recoils
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DOI：
10.1103/physrevd.97.112005
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发表时间：
2018-06-19
影响因子：
5
通讯作者：
Wilson, J. N.
中科院分区：
文献类型：
--
作者：
Agnes, P.;Dawson, J.;Wilson, J. N.
奥赛核物理研究所 (IPNO) 为氩电离和闪烁响应 (ARIS) 实验建造的液氩时间投影室暴露在高度准直和准单能独角兽中子束下，以研究对核和电子反冲的闪烁响应。布置在设备周围的液体闪烁体探测器阵列标记散射中子并选择 [7, 120] keV 能量范围内的核反冲能量。在零场下高精度测量核反冲的相对闪烁效率，并提取一系列施加电场的离子-电子复合概率。由与束脉冲同时发生的 Li-7* 去激发发射的伽马产生的单散射康普顿电子以及校准伽马源，用于提取作为能量和电子漂移场的函数的复合概率。将 ARIS 结果与三种重组概率参数化（Thomas-Imel、Doke-Birks 和 PARIS）进行比较，从而可以定义液氩对低至几 keV 范围的核和电子反冲响应的全面综合模型。 ARIS 对低能量液氩响应提供的约束可以减少影响基于液氩的暗物质搜索实验灵敏度的系统性。
A liquid argon time projection chamber, constructed for the Argon Response to Ionization and Scintillation (ARIS) experiment, is exposed to the highly collimated and quasimonoenergetic LICORNE neutron beam at the Institut de Physique Nucleaire d'Orsay (IPNO) in order to study the scintillation response to nuclear and electronic recoils. An array of liquid scintillator detectors, arranged around the apparatus, tag scattered neutrons and select nuclear recoil energies in the [7, 120] keV energy range. The relative scintillation efficiency of nuclear recoils is measured to high precision at null field, and the ion-electron recombination probability is extracted for a range of applied electric fields. Single-scattered Compton electrons, produced by gammas emitted from the deexcitation of Li-7* in coincidence with the beam pulse, along with calibration gamma sources, are used to extract the recombination probability as a function of energy and electron drift field. The ARIS results are compared with three recombination probability parametrizations (Thomas-Imel, Doke-Birks, and PARIS), allowing for the definition of a fully comprehensive model of the liquid argon response to nuclear and electronic recoils down to the few-keV range. The constraints provided by ARIS to the liquid argon response at low energy allow the reduction of systematics affecting the sensitivity of dark matter search experiments based on liquid argon.