Ionization yield measurement in a germanium CDMSlite detector using photo-neutron sources

Ionization yield measurement in a germanium CDMSlite detector using photo-neutron sources
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使用光中子源测量锗 CDMSlite 探测器中的电离产额

DOI：
10.1103/physrevd.105.122002
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发表时间：
2022
期刊：
Physical Review D
影响因子：
5
通讯作者：
Bathurst, C.
Bathurst, C.
中科院分区：
物理与天体物理2区
文献类型：
--
作者：
Albakry, M. F.;Alkhatib, I.;Amaral, D. W. P.;Aralis, T.;Aramaki, T.;Arnquist, I. J.;Ataee Langroudy, I.;Azadbakht, E.;Banik, S.;Bathurst, C.

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在SuperCDMS合作项目中，两个光中子源和两个中子源被用来研究CDMSlite锗探测器中核反冲的电离产率。这项工作评估了在温度为的情况下，核反冲能在1到7千电子伏特之间的产率。我们使用ageant4模拟来模拟中子谱，假设电荷产率模型是标准Lindhard模型的推广，由两个能量相关参数组成。我们使用模拟的中子谱、模拟的背景和实验数据进行似然分析，以获得产率模型的最佳拟合值。反冲能在1和7 keV之间的电离产率明显低于标准林德模型对锗的预测。使用各种技术研究核反冲产率的低能量范围的不同实验之间普遍缺乏一致性，这对于解释直接暗物质搜索是最关键的。这表明许多直接检测实验用于模拟其主要信号检测机制的物理过程的复杂性，并强调需要进一步研究以澄清迄今为止尚未得到很好理解的潜在系统效应。
Two photo-neutron sources,and, have been used to investigate the ionization yield of nuclear recoils in the CDMSlite germanium detectors by the SuperCDMS collaboration. This work evaluates the yield for nuclear recoil energies between 1 and 7 keV at a temperature of. We use ageant4 simulation to model the neutron spectrum assuming a charge yield model that is a generalization of the standard Lindhard model and consists of two energy dependent parameters. We perform a likelihood analysis using the simulated neutron spectrum, modeled background, and experimental data to obtain the best fit values of the yield model. The ionization yield between recoil energies of 1 and 7 keV is shown to be significantly lower than predicted by the standard Lindhard model for germanium. There is a general lack of agreement among different experiments using a variety of techniques studying the low energy range of the nuclear recoil yield, which is most critical for interpretation of direct dark matter searches. This suggests complexity in the physical process that many direct detection experiments use to model their primary signal detection mechanism and highlights the need for further studies to clarify underlying systematic effects that have not been well understood up to this point.
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