Silicon Photomultipliers (SiPMs) have emerged as a compelling photosensor solution for detecting single photons in applications ranging from particle physics to medical imaging and beyond. SiPMs consist of an array of tightly packaged Single Photon Avalanche Diodes (SPADs) operated above the breakdown voltage so that they generate self sustaining charge avalanches upon absorbing an incident...
The quest for detecting Weakly Interacting Massive Particles (WIMPs), considered as prominent candidates for dark matter, has been ongoing for several decades. This presentation will provide an overview of the current progress in major searches conducted using experiments aimed at detecting both high-mass and low-mass (<10 GeV) WIMPs. The discussion will also cover existing technological...
Liquid phase xenon electroluminescence allows us to achieve a perfect extraction efficiency by eliminating the liquid-gas interface, at the cost of having a low single-electron gain. For low-energy searches, we are concerned with the discrimination between electronic and nuclear recoils (ER and NR), as well as the single-electron background. In this talk, we shall show evidence that ER/NR...
Considering the fundamental role of the electric drift field in the formation and collection of the signals produced in the active volume of a dual-phase time projection chamber (TPC), significant effort was dedicated to the design and simulation of the field cage of the XENONnT TPC. The outcome of this work is an innovative double-array structure connected by an easily accessible voltage...
NEXT-100 is a high-pressure gaseous time projection chamber searching for neutrinoless double beta decay with enriched xenon-136. Ionisation electrons are amplified in the detector through the use of electroluminescent (EL) amplification which enables proportional gain with minimal fluctuations enabling sub-percent energy resolution. The experiment is in the final stages of construction...
Present the status of the LZ experiment searches for new physics via low-energy electron recoils using first science run data, focusing on two monoenergetic signals: axion-like particles (ALPs) and hidden photons (HP).
The Xe-based dark matter search experiment XENONnT searches for rare events such as dark matter recoil and solar pp neutrino signals. It requires accurate estimates of the background. The radioactive isotope 85Kr in Xe is one of the background sources in these searches. To reduce the uncertainty of its abundance, 85Kr abundance estimation using delayed coincidence counting has been introduced....
We are investigating the use of field emission arrays (FEAs) made of silicon to purify a liquid xenon detector. It is known that electronegative contaminants can be drifted by attaching electrons to them and using an external field. Our main objective is to see if either electrons or holes can be used to drift Rn in LXe, with the ultimate goal being to use this to remove Rn from LXe. We are...
Radon is a key background consideration in experiments that search for rare events such as dark matter interactions and neutrinoless double-beta decay. For future noble-liquid and -gas detectors, radon emanated into the detection medium will need to be tightly controlled through radon emanation screening of the wetted materials. I will present systems for low-level measurement of radon...
Dust particulate fallout on materials in use for rare-event searches is a concerning source of radioactive backgrounds due to the presence of the naturally occurring radionuclides. Much effort is dedicated to understanding backgrounds from dust and evaluating mitigation procedures. In this work, an ICP-MS based methodology is presented that demonstrates a direct determination of fallout rates...
We are developing a dark matter direction sensitive detector based on ZnWO_4_ crystals which have anisotropic scintillation response . In this poster, we discuss quantitatively the anisotropy of scintillation of oxygen nuclear recoils for a 670 keV neutron beam produced by T(p,n) reaction at AIST.
FlameNEST is a novel approach to statistical inference for liquid xenon time projection chambers that enables the incorporation of higher-dimensional observable spaces and correlated shape-varying nuisance parameters in a computationally efficient manner. It is currently being used for statistical inference and detector calibration fits enabling dark matter searches with the world-leading...
This is an introduction to the new Liquid Xenon R&D facility currently under construction at the Johannes Gutenberg University Mainz (JGU Mainz) in the new Centre for Fundamental Physics (CFP-II). The Xenon liquefaction facility is designed to store, purify, and distribute up to 500kg of liquid xenon to two neighboring laboratories eventually. The liquid xenon can be recuperated by gravity in...
DarkSide-50 is a direct dark matter search experiment using a dual phase argon time projection chamber filled with low-radioactivity underground argon. Based solely on the ionization spectrum, it has set the most stringent exclusion limits for several low-mass dark matter candidates. Such analyses suffer from so-called spurious electron (SE) events at the lowest detectable energy region and...
Liquid xenon TPCs have observed high rates of pathological electrons in the low-energy region, which impair their sensitivities in dark matter searches. They are a direct background to low-mass dark matter interactions that may only produce sub-keV nuclear recoils, and also contribute accidental coincidence backgrounds in large experiments. I will review the studies of low-energy photon and...
The PandaX-4T experiment employs a liquid xenon time projection chamber (TPC) to investigate keV-scale nuclear recoils, with the primary objective of directly detecting heavy cold dark matter (10GeV – 10TeV). Additionally, PandaX-4T has expanded its exploration to the sub-keV energy range by reducing the analysis threshold. As a result, it has achieved remarkable sensitivities in searching for...
The MEG II experiment searches for new physics like SUSY-GUT/SUSY-seesaw through the lepton flavor violating mu+->e+ gamma with ten times better sensitivity than the MEG expriment( B(mu+ -> e+ gamma) < 4.2x10-13 at 90% CL in 2016). Because the sensitivity of the MEG experiment was already limited by accidental background, the MEG detector was upgraded to realize one order of magnitude better...
Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0$\nu \beta \beta$), due to their response uniformity, monolithic sensitive volume, scalability to large target masses, and suitability for extremely low background operations. The nEXO collaboration has designed a five-tonne time projection chamber that aims to search for 0$\nu \beta...
Liquid Argon Time Projection Chambers (TPC) are promising detectors for dark matter search due to their response uniformity, scalability to large target masses, and suitability for extremely low background operations. The DarkSide-20k experiment is a new dark matter detector under construction at Istituto Nazionale di Fisica Nucleare (INFN) Laboratori Nazionali del Gran Sasso (LNGS) that...
AXEL group is developing a high pressure xenon gas detector to search for neutrinoless double beta decay. We will report on our dedicated electron readout system ELCC (electroluminescence collection cell).
Photomultiplier tube (PMT) is one of the best best candidate device as the photo sensor for rare event search experiments, such as dark matter particle interactions and neutrinoless double beta decay events.
For future experiments, one of the issue that needs to be addressed is its relatively large RI amount due to large amount of material used for the device.
R13111 is a very low-background...
The nEXO detector, a 5 ton-scale single-phase liquid xenon time projection chamber enriched to 90% in the isotope 136Xe, plans to observe the groundbreaking phenomenon of neutrinoless double beta decay, producing first data in 2030. Its projected sensitivity is robust against backgrounds and “unknown unknowns” due to the use of multiple observables for signal-to-background discrimination, not...
The innovative Underground Argon (UAr) Production is part, and a fundamental pillar of the Argon Dark Matter search program, led by the Global Argon Dark Matter Collaboration (GADMC). The aims of the UAr Production is to achieve the procurement of large amounts of low-radioactive UAr, which will be firstly used by the DarkSide-20k experiment. The UAr Production is composed by three projects...
To satisfy the sensitivity requirements for the next generation of liquid xenon dark matter detectors, the radon-induced background must be reduced at least by one order of magnitude with respect to the level reached by the current detector generation (XENONnT 222-Rn activity ~ 1 muBq/kg). The existing technology might not be sufficient to reach this goal; therefore, other strategies must be...
