A5013632412- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Radio Astronomy Observations and Technology
- Photocathodes and Microchannel Plates
- History and Developments in Astronomy
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
- Video Surveillance and Tracking Methods
- Gamma-ray bursts and supernovae
- Age of Information Optimization
- Autism Spectrum Disorder Research
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Advanced Electrical Measurement Techniques
- Power Transformer Diagnostics and Insulation
- Adaptive optics and wavefront sensing
- Visual Attention and Saliency Detection
- Obsessive-Compulsive Spectrum Disorders
Los Alamos National Laboratory
2019-2024
University of New Mexico
2010-2020
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2016
Istituto Nazionale di Fisica Nucleare
2016
University Health Network
2012
Consejo Nacional de Investigaciones Científicas y Técnicas
2011
Universidad Nacional de La Plata
2011
Institute of Physics Rosario
2011
University of Buenos Aires
2011
Comisión Nacional de Energía Atómica
2011
Now that conventional weakly interacting massive particle (WIMP) dark matter searches are approaching the neutrino floor, there has been a resurgence of interest in detectors with sensitivity to nuclear recoil directions. A large-scale directional detector is attractive it would have below be capable unambiguously establishing galactic origin purported signal, and could serve dual purpose as observatory. We present first detailed analysis 1000 m$^3$-scale measuring signal at low energies....
The addition of O2 to gas mixtures in time projection chambers containing CS2 has recently been shown produce multiple negative ions that travel at slightly different velocities. This allows a measurement the absolute position ionising events z (drift) direction. In this work, we apply z-fiducialisation technique directional dark matter search. We present results from 46.3 live-day source-free exposure DRIFT-IId detector run new mode. With full-volume fiducialisation, have achieved first...
A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with major improvement in sensitivity compared to the existing limit search for neutron Electric Dipole Moment (EDM). This uses superfluid 4He produce high density of Ultra-Cold Neutrons (UCN) which are contained suitably coated pair measurement cells. The be operated at Spallation Neutron Source Oak Ridge National Laboratory, polarized 3He from an Atomic Beam injected into and transported cells where it serves as...
The current status of the DRIFT (Directional Recoil Identification From Tracks) experiment at Boulby Mine is presented, including latest limits on WIMP spin-dependent cross-section from 1.5 kg days running with a mixture CS2 and CF4. Planned upgrades to IId are detailed, along ongoing work towards III, which aims be world's first 10 m3-scale directional Dark Matter detector.
Radon gas emanating from materials is of interest in environmental science and also a major concern rare event non-accelerator particle physics experiments such as dark matter double beta decay searches, where it source background. Notable for the production radon progeny recoils (RPRs), low energy (∼ 100 keV) daughter isotopes, which can mimic signal expected WIMP interactions. Presented here are results measurements emanation detector 1 m3 DRIFT-II directional time projection chamber...
SF6 is an inert and electronegative gas that has a long history of use in high voltage insulation numerous other industrial applications. Although used as trace component to introduce stability tracking chambers, its highly properties have limited detectors. In this work we present series measurements with the primary low pressure Time Projection Chamber (TPC), thick GEM avalanche readout device. The first results 55Fe energy spectrum are presented. Measurements mobility longitudinal...
Recent computational results suggest that directional dark matter detectors have potential to probe for WIMP particles below the neutrino floor. The DRIFT-IId detector used in this work is a leading search time projection chamber detector. We report first measurements of detection nuclear recoils fully fiducialised low-pressure chamber. In new operational mode, distance between each event vertex and readout plane determined by measurement minority carriers produced adding small amount oxygen...
Low-pressure gas Time Projection Chambers being developed for directional dark matter searches offer a technology with strong particle identification capability combined the potential to produce definitive detection of Galactic Weakly Interacting Massive Particle (WIMP) matter. A source events able mimic genuine WIMP-induced nuclear recoil tracks arises in such experiments from decay radon inside vacuum vessel. The recoils that result associated daughter nuclei are termed Radon Progeny...
Object re-identification (ReID) is prone to errors under variations in scale, illumination, complex background, and object occlusion scenarios. To overcome these challenges, attention mechanisms are employed focus on the object's characteristics, thereby extracting better discriminative features. This paper introduces a local-global vision transformer (LoGoViT) for by learning hierarchical-level representation from fine-grained (local) general (global) context It comprises two components:...
The dependence on applied electric field ($0 - 40$ kV/cm) of the scintillation light produced by fast electrons and $\alpha$ particles stopped in liquid helium temperature range 0.44 K to 3.12 is reported. For both types particles, reduction intensity signal due exhibits an apparent dependence. Using approximate solution Debye-Smoluchowski equation, we show that for can be explained time required geminate pairs recombine relative detector integration time. This finding indicates spatial...
The addition of O2 to gas mixtures in time projection chambers containing CS2 has recently been shown produce multiple negative ions that travel at slightly different velocities. This allows a measurement the absolute position ionising events z (drift) direction. In this work, we apply z-fiducialisation technique directional dark matter search. particular, present results from 46.3 live-day source-free exposure DRIFT-IId detector run completely new mode. With full-volume fiducialisation,...
Acrylic is a common material used in dark matter and neutrino detectors for light guides, transparent vessels, neutron shielding, creating an intermediate medium between the target volume photodetectors. has low absorption within visible spectrum high capture cross section neutrons. The natural radioactivity photodetectors major source of background neutrons making use acrylic attractive shielding reduction. To test optical properties we measured transmittance attenuation length fourteen...
The design of the project named CYGNO is presented. a new proposal supported by INFN, Italian National Institute for Nuclear Physics, within CYGNUs proto-collaboration (CYGNUS-TPC) that aims to realize distributed observatory in underground laboratories directional Dark Matter (DM) search and identification coherent neutrino scattering (CNS) from Sun. one first prototypes road map 100-1000 m^3 will be located at Laboratory Gran Sasso (LNGS), Italy, aiming make significant advances technology...
We report results from a study on electrical breakdown in liquid helium using near-uniform-field stainless steel electrodes with stressed area of $\sim$0.725 cm$^2$. The distribution the field is obtained for temperatures between 1.7 K and 4.0 K, pressures saturated vapor pressure 626 Torr, different surface polishes. A data-based approach determining electrode-surface-area scaling presented. dependence probability strength as extracted data used to show that phenomenon closely correlated...
The DRIFT-IId dark matter detector is a m3-scale low-pressure TPC with directional sensitivity to WIMP-induced nuclear recoils. Its primary backgrounds were due alpha decays from contamination on the central cathode. Efforts reduce these led replacing 20 μm wire cathode one constructed 0.9 aluminized mylar, which almost totally transparent particles. Detailed modeling of nature and origin remaining an in-situ, ppt-sensitive assay decay This further improvements in thin-film resulting over 2...
The design of the project named CYGNO is presented. a new proposal supported by INFN, Italian National Institute for Nuclear Physics, within CYGNUs proto-collaboration (CYGNUS-TPC) that aims to realize distributed observatory in underground laboratories directional Dark Matter (DM) search and identification coherent neutrino scattering (CNS) from Sun. one first prototypes road map 100-1000 m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The current status of the DRIFT (Directional Recoil Identification From Tracks) experiment at Boulby Mine is presented, including latest limits on WIMP spin-dependent cross-section from 1.5 kg days running with a mixture CS2 and CF4. Planned upgrades to IId are detailed, along ongoing work towards III, which aims be world's first 10 m3-scale directional Dark Matter detector.
We present results from the first measurement of axial range components fiducialized neutron induced nuclear recoil tracks using DRIFT directional dark matter detector. Nuclear events are in experiment temporal charge carrier separations between different species anions 30:10:1 Torr CS2:CF4:O2 gas mixture. For this measurement, neutron-induced were generated by exposing detector to 252Cf source directions. Using these events, sensitivity expected signatures investigated as was moved one axis...