arXiv 2602.221552026-02-25nucl-exhep-ex

利用ReD和ReD+将氩核 recoil 直接测量扩展至亚keV范围

Extending direct measurements of argon nuclear recoils into the sub-keV regime with ReD and ReD+

INFN, Laboratori Nazionali del Sud（意大利国家核物理研究所，南方实验室）

Noemi Pino

备注：: 7 pages, 2 figures, conference proceedings

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AI总结：

ReD和ReD+实验通过测量氩核 recoil 离子化产率，将直接测量扩展至亚keV范围，为低质量WIMP暗物质搜索提供关键数据。

摘要：

直接搜索以WIMPs形式存在的暗物质的氩基探测器需要精确测量低能核 recoil 的离子化产率\Qy\\。在本工作之前，直接实验数据仅在6.7 keV以上可用，留下了一个对低质量WIMP搜索最相关的能量区域的关键空白。Recoil Directionality（ReD）实验通过使用中子源的双相TPC照射，测量了2至10 keV范围内的氩\Qy\\，以解决这一限制。结果将现有直接测量扩展到更低的能量，显示出与7 keV以上数据的一致性，并表明在低 recoil 能量下离子化产率增强。这些测量为下一代氩基暗物质搜索提供了必要的输入，并直接推动了升级版ReD+阶段的设计，旨在进一步将灵敏度扩展至亚keV recoil 能量范围。

英文摘要：

Direct searches for dark matter in the form of WIMPs with argon-based detectors require precise measurements of the ionization yield \Qy\ for nuclear recoils at low energies. Prior to this work, direct experimental data were available only above 6.7 keV, leaving a critical gap in the energy region most relevant for low-mass WIMP searches. The Recoil Directionality (ReD) experiment addressed this limitation by measuring the argon \Qy\ for nuclear recoils between 2 and 10 keV using a dual-phase TPC irradiated with neutrons from a \Cf\ fission source. The results extend existing direct measurements to lower energies, show consistency with previous data above 7 keV, and indicate an enhanced ionization yield at low recoil energies. These measurements provide essential input for next-generation argon-based dark matter searches and directly motivate the upgraded ReD+ phase, designed to further extend sensitivity into the sub-keV recoil-energy regime.

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摘要：

英文摘要：

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