Liquid-noble Bubble Chambers for Dark Matter and CEvNS Detection
用于暗物质和 CEvNS 检测的液态惰性气泡室
基本信息
- 批准号:2310112
- 负责人:
- 金额:$ 54.99万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2023
- 资助国家:美国
- 起止时间:2023-09-01 至 2026-08-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
The identity of dark matter, which makes up nearly 85% of the matter in the Universe, and the origin of the matter/anti-matter asymmetry are two of the current fundamental unknowns in modern physics. Novel instrumentation is under development aimed at resolving both challenges via searches for GeV-scale dark matter and precision measurements of neutrino properties via coherent elastic scattering (CEvNS) of reactor neutrinos. Scalable background-discriminating techniques, like Scintillating Bubble Chambers (SBC), hold the potential to revolutionize the sensitivity in these searches. This award supports personnel at Northwestern University and Northeastern Illinois University in operating, and analyzing the data from, a 10kg liquid-argon SBC located at the Fermi National Accelerator Laboratory located near Batavia IL USA. The team will characterize response of the SBC to determine the low-threshold reach of this technology to distinguish electron and nuclear recoils below approximately 1 keV. The award provides unique opportunities for hands-on instrumentation experiences for undergraduate researchers, with a directed effort to broaden access to, and participation within, the physics community for local low-income and first-generation students. Nuclear recoils in liquid-noble gas bubble chambers simultaneously create a flash of scintillation light and nucleate a single bubble in a superheated liquid target. By combining the electron-recoil insensitivity of the instrument and the position reconstruction of a bubble chamber with the event-by-event energy resolution of a scintillator, the SBC technique holds the potential to eliminate all known backgrounds to dark matter and CEvNS signals. In addition, superheated noble liquids maintain electron-recoil insensitivity at far higher degrees of superheat than can be achieved in existing molecular-fluid bubble chamber, potentially extending the quasi-background-free operation of the SBC to thresholds as low as 100 eV. The SBC ability to discriminate the electron- and nuclear-recoils at low-energy may suppress background event levels to that needed to reach the solar neutrino coherent scattering flow in a dark matter search, and to achieve signal-to-noise of better than 1 in reactor CEvNS studies.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
暗物质的身份占宇宙中物质的近85%,而物质/反物质不对称的起源是现代物理学中当前的两个基本未知数。新的仪器正在开发中,旨在通过搜索GEV规模的暗物质和通过反应堆中微子的相干弹性散射(CEVN)来解决中微子性质的精确测量。可扩展的背景歧视技术,例如闪烁的气泡室(SBC),具有彻底改变这些搜索敏感性的潜力。 该奖项为西北大学和伊利诺伊州西北大学的人员提供了支持,并分析了位于美国巴达维亚IL附近的Fermi National Accelerator实验室的10kg液体 - 阿尔贡SBC。 该团队将表征SBC的响应,以确定该技术的低阈值范围,以区分大约1 KEV的电子和核后坐力。该奖项为本科研究人员提供了独特的机会,为本科研究人员提供了努力,以扩大对当地低收入和第一代学生的物理社区的访问和参与。液体液体气泡室中的核后坐力同时产生了闪烁光的闪光,并在过热的液体靶标中构成了单个气泡。 通过将仪器的电子回收不敏感性和气泡室的位置与闪烁体的逐个事件分辨率相结合,SBC技术具有消除所有已知背景到暗物质和CEVNS信号的潜力。 此外,超热的贵族液体在现有的分子流体泡泡室中维持电子回导的不敏感性,而超热则可以实现,这可能会将SBC的准背景运行扩展到低至100 eV的阈值。 SBC在低能量下区分电子和核循环的SBC能力可能会抑制背景事件水平,即在暗物质搜索中达到太阳中微子相干散射流所需的能力,并实现比1更好的信噪比。该奖项在反应堆CEVNS研究中反映了NSF的法定使命,并被认为是值得通过基金会的知识分子优点和更广泛影响的评论标准来评估的。
项目成果
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