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arXiv 2401.09262physics.ins-dethep-ex
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气态氙中红外闪烁时间响应慢成分的研究

Investigating the slow component of the infrared scintillation time response in gaseous xenon

Robert Hammann, Kai Böse, Luisa Hötzsch, Florian Jörg, Teresa Marrodán Undagoitia

AI总结:

本文通过延长测量时间窗口至约3 μs,研究了常压室温气态氙中α粒子红外闪烁的慢成分,确定其衰减时间约850 ns,并测得光产额(6347 ± 22 (stat) ± 400 (syst)) ph/MeV,同时排除电子漂移或复合发光的贡献。

摘要:

氙是若干稀有事件搜寻中的首选靶材料。在常用的真空紫外(VUV)光之外,利用红外(IR)闪烁光有可能提高这些实验的灵敏度。理解氙的红外闪烁响应对于评估改进潜力至关重要。本研究重点表征常压和室温下气态氙中α粒子红外闪烁的时间响应和光产额(LY)。我们此前已观察到时间响应可由两个成分描述:一个具有O(ns)量级的快时间常数,另一个具有O(μs)量级的慢时间常数。本工作给出了新的测量结果,增进了我们对慢成分的理解。实验装置经过改进,使得红外闪烁时间响应能够在约3 μs的十倍更长的时间窗口内进行测量,从而有效降低了光产额测量中占主导地位的系统不确定度。我们发现约1 bar气压下的慢成分可以用衰减时间约为850 ns的单一指数函数描述。测得光产额为(6347 ± 22 (stat) ± 400 (syst)) ph/MeV,与我们先前的测量结果一致。此外,还进行了沿α粒子径迹零电场条件下的测量,以排除慢成分主要由漂移电子发光或电子与离子复合发光所主导的可能性。

英文摘要:

Xenon is the target material of choice in several rare event searches. The use of infrared (IR) scintillation light, in addition to the commonly used vacuum ultraviolet (VUV) light, could increase the sensitivity of these experiments. Understanding the IR scintillation response of xenon is essential in assessing the potential for improvement. This study focuses on characterizing the time response and light yield (LY) of IR scintillation in gaseous xenon for alpha particles at atmospheric pressure and room temperature. We have previously observed that the time response can be described by two components: one with a fast time constant of O(ns) and one with a slow time constant of O($\mathrmμ$s). This work presents new measurements that improve our understanding of the slow component. The experimental setup was modified to allow for a measurement of the IR scintillation time response with a ten times longer time window of about 3 $\mathrmμ$s, effectively mitigating the dominant systematic uncertainty of the LY measurement. We find that the slow component at about 1 bar pressure can be described by a single exponential function with a decay time of about 850 ns. The LY is found to be (6347 $\pm$ 22 (stat) $\pm$ 400 (syst)) ph / MeV, consistent with our previous measurement. In addition, a measurement with zero electric field along the alpha particle tracks was conducted to rule out the possibility that the slow component is dominated by light emission from drifting electrons or the recombination of electrons and ions.

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