按需生产和部署 37Ar 源,用于 ReD 液氩 TPC 中的低能核反冲测量

P. Zakhary
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引用次数: 0

摘要

由于在暗物质(DM)质量较高的区域尚未发现确凿证据,寻找轻暗物质(< 10 GeV/c 2)变得越来越重要。为了探索这个轻质量范围,有必要精确模拟惰性液体时间投影室(TPC)探测器对低能量(< 1 keV)核反冲(NRs)的响应。在这方面,37Ar是低能区的理想校准源,因为它在电子俘获后会产生0.27和2.82千伏的两个低能峰,半衰期为35天。我们提出了一种利用 40Ca(n,α)37Ar 反应生产 37Ar 而无需化学或加热处理的方法。这可以通过用中子源(如 AmBe)辐照纳米氧化钙粉末,让产生的 37Ar 扩散到双相 TPC 内部使用的氩气中来实现。通过在反冲方向性(ReD)实验中测量相对于这两个低能点的 NR 产量,可以用部署的相同中子源对其他探测器进行交叉校准。本讲座将介绍 37Ar 源的生产、部署和初步结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
37Ar source on-demand production and deployment for low-energy nuclear recoil measurement in ReD liquid Argon TPC
The search for light dark matter (< 10 GeV/c 2) has become increasingly important, since no conclusive evidence has been found in the higher dark matter (DM) mass region. In order to explore this light mass range, it is necessary to accurately model the response of the noble liquid time projection chamber (TPC) detectors, used in many experiments aimed at the direct measurement of DM, to low energy (< 1 keV) nuclear recoils (NRs). In this respect,  37Ar provides an ideal calibration source in the low-energy region due to its two low-energy peaks at 0.27 and 2.82 keV following electron capture with a 35-day half-life. We propose a method to produce  37Ar without chemical or heating treatments by using the 40Ca(n,α)37Ar reaction. This can be achieved by irradiating nano-CaO powder with a neutron source (e.g. AmBe) and allowing the produced 37Ar to diffuse into the argon used inside a double-phase TPC. By measuring the NR yields relative to those two low-energy points in the Recoil Directionality (ReD) experiment, other detectors can be cross-calibrated with the same source deployed. In this talk, the 37Ar source production, its deployment, and preliminary results will be presented.
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