A5073295414- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Scientific Research and Discoveries
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- CCD and CMOS Imaging Sensors
- Geophysical Methods and Applications
- Fusion materials and technologies
- Seismology and Earthquake Studies
- Laser-Plasma Interactions and Diagnostics
- International Science and Diplomacy
- Age of Information Optimization
- Radiation Shielding Materials Analysis
- Radiation Detection and Scintillator Technologies
- Underwater Acoustics Research
- Space Science and Extraterrestrial Life
- Radiation Dose and Imaging
- Scientific Computing and Data Management
- Astronomy and Astrophysical Research
- Radioactivity and Radon Measurements
- Laser Design and Applications
University of Sheffield
2012-2020
ETH Zurich
2011
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...
The T2K experiment studies oscillations of an off-axis muon neutrino beam between the J-PARC accelerator complex and Super-Kamiokande detector. Special emphasis is placed on measuring mixing angle theta_13 by observing electron appearance via sub-dominant to oscillation, searching for CP violation in lepton sector. includes a sophisticated, off-axis, near detector, ND280, situated 280 m downstream production target order measure properties understand better interactions at energy scale below...
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...
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...
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,...
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 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...
Using a combination of HfO 2 , SiO and Al O 3 interference coatings for λ =355nm were fabricated by ion beam co-sputtering. The use mixtures is effective extending the UV cutoff to =~190 nm. in design anti-reflective improves their laser damage resistance.
The deep underground laboratories of the world are no longer scientific realm astroparticle physics alone. From Mars rovers to muon tomography, and from radioactive dating astrobiology, Sean Paling Stephen Sadler describe renaissance in science taking place far beneath our feet.
Stephen Sadler reviews how the UK's latest underground dark-matter detection experiment, DRIFT, fits into worldwide effort to find out what makes up this mysterious form of matter.