用~（252）Cf中子测量DRIFT-II探测器的距离分量方向特征

Demonstration of ThGEM-Multiwire Hybrid Charge Readout for Directional Dark Matter Searches

Sensitivities of current directional dark matter search detectors using gas time projection chambers are now constrained by target mass. A ton-scale gas TPC detector will require large charge readout areas. We present a first demonstration of a novel ThGEM-Multiwire hybrid charge readout technology which combines the robust nature and high gas gain of Thick Gaseous Electron Multipliers with lower capacitive noise of a one-plane multiwire charge readout in SF$_6$ target gas. Measurements performed with this hybrid detector show an ion drift velocity of $139~\pm~12~\text{ms}^{-1}$ in a reduced d…

与定向暗物质散射有关的气体中核反冲头-尾特征的模拟

Simulations of the Nuclear Recoil Head-Tail Signature in Gases Relevant to Directional Dark Matter Searches

我们提出了第一个详细的模拟头尾效应相关的定向暗物质搜索。大多数的电离电荷的位置的调查，无论是在开始的一半（尾部）或在结束的一半（头部）的核反冲轨道进行碳和硫反冲在40托负离子二硫化碳和氟反冲在100托四氟化碳。SRIM模拟程序，连同一个专门编写的蒙特卡罗发生器，用于模拟生产的电离对，扩散和基本读出几何相关的潜在的真实探测器的情况下，如正在开发的漂移实验。结果清楚地表明存在的头-尾轨道不对称性，但严重影响的幅度由两个竞争因素：性质的阻止能力和细节的范围离散。前者往往导致尾部大于头部，后者则相反。

SF$_6$用于方向性暗物质实验的新特性

The novel properties of SF$_6$ for directional dark matter experiments

本研究展示SF$_6$作为低压TPC主要气体的测量结果，发现其多物种漂移特性，证实其高氟含量、低扩散和可完全定标，是方向性暗物质探测的理想气体。

基于Micromegas的μTPC-MIMAC探测器的暗物质方向性探测性能

Dark Matter Directionality Detection performance of the Micromegas-based $μ$TPC-MIMAC detector

本文研究了基于Micromegas的μTPC-MIMAC探测器的暗物质方向性探测性能，通过低能离子束和单能中子场实验测量了核反冲径迹的角分布，发现其角分辨率优于15度，并证明质子是探测轻WIMPs的更优靶材。

Demonstrating a directional detector based on neon for characterizing high energy neutrons

MITPC is a gas-based time projection chamber used for detecting fast, MeV-scale neutrons. The standard version of the detector relies on a mixture of 600~torr gas composed of 87.5% $^4$He and 12.5% CF$_4$ for precisely measuring the energy and direction of neutron-induced nuclear recoils. We describe studies performed with a prototype detector investigating the use of Ne, as a replacement for $^4$He, in the gas mixture. Our discussion focuses on the advantages of Ne as the fast neutron target for high energy neutron events ($\lesssim$100 MeV) and a demonstration that the mixture will be effect…

氢化碳结构作为方向性亚GeV暗物质探测器

Hydrogenated carbon structures as directional sub-GeV dark matter detectors

利用氢化碳结构作为方向性亚GeV暗物质探测器，通过高灵敏度和低能量阈值实现高效的暗物质检测与背景抑制。

DRIFT-IIa暗物质探测器的初步结果

First Results from the DRIFT-IIa Dark Matter Detector

从DRIFT-IIa定向暗物质实验的数据，收集在近连续6个月的运行期间。详细的校准分析比较了来自伽马射线、X射线和中子源的数据与GEANT 4蒙特卡罗模拟的数据，揭示了94+/-2（stat.）+/-的中子感应反冲的探测效率。5（系统）%。基于软件的切割，旨在消除非核反冲事件，被证明拒绝60钴伽马射线与拒绝因子优于8x 10 -6的所有能量以上的阈值。一个意想不到的事件人口已被发现，并显示在这里是由于α衰变的222 Rn子核已连接到中央阴极。通过对非屏蔽和屏蔽数据的分析，得出了博尔比地下实验室中子通量的限制。

Rock Neutron Backgrounds from FNAL Neutrino Beamlines in the $ν$BDX-DRIFT Detector

The $ν$BDX-DRIFT collaboration seeks to detect low-energy nuclear recoils from CE$ν$NS or BSM interactions at FNAL. Backgrounds due to rock neutrons are an important concern. We present a~\texttt{GENIE} and~\texttt{GEANT4} based model to estimate backgrounds from rock neutrons produced in neutrino-nucleus interactions within the rock walls surrounding the underground halls. This model was bench-marked against the $2009$ COUPP experiment performed in the MINOS hall in the NuMI neutrino beam, and agreement is found between experimental results and the modeled result to within $30\%$. Working fro…

来自银河系中心方向的宇宙线向上散射的轻暗物质的方向性直接探测

Directional direct detection of light dark matter up-scattered by cosmic rays from direction of the Galactic center

本研究针对 MeV 尺度暗物质难以直接探测的问题，提出利用宇宙线向上散射机制，模拟核反冲并定量揭示大量暗物质来自银河系中心方向，证明未来方向性探测器能以超过 5σ 置信度验证该特征。

Obtaining supernova directional information using the neutrino matter oscillation pattern

A nearby core collapse supernova will produce a burst of neutrinos in several detectors worldwide. With reasonably high probability, the Earth will shadow the neutrino flux in one or more detectors. In such a case, for allowed oscillation parameter scenarios, the observed neutrino energy spectrum will bear the signature of oscillations in Earth matter. Because the frequency of the oscillations in energy depends on the pathlength traveled by the neutrinos in the Earth, an observed spectrum contains also information about the direction to the supernova. We explore here the possibility of constra…

暗物质激发的DRIFT-II负离子TPC中的低能电子和核反冲

Low Energy Electron and Nuclear Recoil Thresholds in the DRIFT-II Negative Ion TPC for Dark Matter Searches

了解在尽可能低的能量下测量和区分粒子事件的能力是开发新实验以寻找弱相互作用大质量粒子（WIMP）暗物质的基本要求。在本文中，我们详细评估了1 m^3 DRIFT-II定向灵敏、低压负离子时间投影室（NITPC）中低于10 keV的潜在灵敏度，该评估基于多丝正比室（MWPC）读出中的逐事件径迹重建和量热法。通过应用一个数字平滑多项式，它表明，探测器是敏感的硫和碳反冲分别下降到2.9和1.9 keV，和1.2 keV的电子感生事件。通过5.9 keV的γ谱的55 Fe，其中的能量分辨率是足够的，以确定逃逸峰的能量灵敏度证明。较低的能量灵敏度对WIMP排斥极限的影响被证明。除了反冲方向重建的WIMP搜索，这种灵敏度表明新的应用前景也在KK轴子搜索。

Background Assay and Rejection in DRIFT

The DRIFT-IId dark matter detector is a m$^3$-scale low-pressure TPC with directional sensitivity to WIMP-induced nuclear recoils. Its primary backgrounds were due to alpha decays from contamination on the central cathode. Efforts to reduce these backgrounds led to replacing the 20 μm wire central cathode with one constructed from 0.9 μm aluminized mylar, which is almost totally transparent to alpha particles. Detailed modeling of the nature and origin of the remaining backgrounds led to an in-situ, ppt-sensitive assay of alpha decay backgrounds from the central cathode. This led to further im…