We report the final dark matter (DM) search results and background spectrum measurement from a 1.2 g·day exposure of an upgraded SuperCDMS high-voltage eV-resolution (HVeV) detector. The 1×1×0.4 cm3 (0.93 g) HVeV detector is able to detect single electron-hole pair production by sensing phonons produced by the Neganov-Trofimov-Luke effect at a voltage bias of 100 V. Relative to the...
The DarkSide multi-stage program aims to search for WIMPs by building and operating a dual phase liquid Argon (LAr) time projection chamber (TPC). The upcoming DarkSide-20k detector, with a fiducial mass of 20 tonnes of depleted liquid Argon, will operate in the underground laboratories of “Laboratori Nazionali del Gran Sasso”. The photodetection relies on Silicon photomultipliers (SiPMs)....
Superfluid He-4 is a promising target material for direct detection of light (< 1 GeV) dark matter. Signal channels for dark matter - nucleus interactions in superfluid helium include prompt photons, triplet excimers, rotons and phonons, but measurement of these signal strengths have yet to be performed for low energy nuclear recoils. A measurement of the prompt scintillation yield from...
Historically, dark matter direct detection experiments searching for dark matter in the form of Weakly Interacting Massive Particles (WIMPs) typically consider only two couplings between atomic nuclei and the WIMP: spin-independent and spin-dependent interactions. However, the lack of of an observed WIMP signal encourages consideration of more WIMP-nucleon interaction types, and recent...
LUX-ZEPLIN (LZ) is a direct detection dark matter experiment, currently under construction 4850ft underground at the Sanford Underground Research Facility in Lead, SD, USA. At the core of the LZ design is a dual-phase liquid Xe time projection chamber (TPC) with a 7 ton active mass. This experiment will achieve a sensitivity of 1.6$\times$10$^{-48}$ cm$^2$ to 40 GeV/c$^2$ WIMPs in a 1000 day...
The two-phase liquid xenon time projection chamber is one of the leading technologies used for dark matter direct detection. World-leading limits on dark matter interactions have been set by LUX and XENON1T, and the upcoming LZ and XENONnT experiments seek to push further. A crucial part of using this technology is being able to classify energy deposits as nuclear recoils (NR) or electron...
The XENON1T experiment searches for Weakly Interacting Massive Particles (WIMPs) with a dual-phase xenon Time Projection Chamber (TPC). To extend its physics reach, the efforts of the XENON collaboration are directed toward exploring other detection channels. For this purpose, considerable work on the signal reconstruction and data analysis has been done to extend the available energy range up...
The PICO collaboration searches for dark matter particles using superheated fluid detectors, or bubble chambers, filled with fluorine-rich targets. These detectors can be made inherently insensitive to electron recoils, while additional background suppression is achieved with the acoustic signature of the bubble nucleation that allows the identification of alpha particles. In this talk I will...
The CYGNUS collaboration is developing a range of approaches towards a global dark matter experiment in the form of an array of nuclear recoil direction sensitive detectors, distributed at multiple underground sites. Here we describe demonstration of two new hybrid TPC charge readout concepts for CYGNUS, capable of use with SF6 negative ion gas. The first comprises a thick GEM gain stage...
The SABRE proof-of-principle (PoP) experiment aims to develop ultra-pure NaI(Tl) scintillators for direct dark matter research. The new SABRE low background NaI(Tl) crystals will be used to probe for the model independent annual modulation, expected for dark matter particles in the galactic halo. The first NaI(Tl) detector is installed underground in passive shielding at the Gran Sasso...
The LUX collaboration has pioneered new techniques in the quest of solving the dark matter puzzle. Using liquid xenon (LXe) dual-phase TPC technologies,
the collaboration set several world leading limits on WIMP dark matter. Even after the detector decommissioning in 2016 the analysis work continues. In this presentation, I will give an overview of the recent results published by the LUX...
Liquid argon targets in WIMP search detectors provide outstanding separation between nuclear and electron recoil signals via pulse-shape discrimination of the scintillation signals. Atmospheric argon (AAr), however, has a naturally occurring radioactive isotope, $^{39}$Ar, a $\beta$ emitter of cosmogenic origin. For large detectors, the atmospheric $^{39}$Ar activity poses pile-up concerns....
