A5053355830- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Particle accelerators and beam dynamics
- Planetary Science and Exploration
- Building Energy and Comfort Optimization
- CCD and CMOS Imaging Sensors
- Radiopharmaceutical Chemistry and Applications
- Muon and positron interactions and applications
- Nuclear physics research studies
- Advanced Radiotherapy Techniques
- Advanced Semiconductor Detectors and Materials
- Medical Imaging Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Male Reproductive Health Studies
- Plasma Diagnostics and Applications
- Building energy efficiency and sustainability
- Magnetic confinement fusion research
University of Bern
2012-2022
University of Zurich
2014-2017
Université de Montréal
1979-2011
University of Alberta
2009
Czech Technical University in Prague
2009
Indiana University South Bend
2009
Laurentian University
2009
University of Sudbury
2009
Queen's University
2009
Hôpital du Sacré-Cœur de Montréal
1996
We report on a search for neutrinoless double-beta decay of $^{136}$Xe with EXO-200. No signal is observed an exposure 32.5 kg-yr, background ~1.5 x 10^{-3} /(kg yr keV) in the $\pm 1\sigma$ region interest. This sets lower limit half-life $T_{1/2}^{0\nu\beta\beta}$($^{136}$Xe) > 1.6 10$^{25}$ (90% CL), corresponding to effective Majorana masses less than 140-380 meV, depending matrix element calculation.
This paper describes the design and construction of MicroBooNE liquid argon time projection chamber associated systems. is first phase Short Baseline Neutrino program, located at Fermilab, will utilize capabilities detectors to examine a rich assortment physics topics. In this document details specifications, assembly procedures, acceptance tests are reported.
We report the observation of two-neutrino double-beta decay in Xe-136 with T_1/2 = 2.11 +- 0.04 (stat.) 0.21 (sys.) x 10^21 yr. This second order process, predicted by Standard Model, has been observed for several nuclei but not Xe-136. The rate provides new input to matrix element calculations and search more interesting neutrino-less decay, most sensitive probe existence Majorana particles measurement neutrino mass scale.
We report on an improved measurement of the $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ half-life ${}^{136}$Xe performed by EXO-200. The use a large and homogeneous time-projection chamber allows for precise estimate fiducial mass used measurement, resulting in small systematic uncertainty. also discuss detail data-analysis methods double-$\ensuremath{\beta}$ decay searches with EXO-200, while emphasizing those directly related to present measurement. is found be...
The development and operation of liquid-argon time-projection chambers for neutrino physics has created a need new approaches to pattern recognition in order fully exploit the imaging capabilities offered by this technology. Whereas human brain can excel at identifying features recorded events, it is significant challenge develop an automated, algorithmic solution. Pandora Software Development Kit provides functionality aid design implementation pattern-recognition algorithms. It promotes...
We present the first results of searches for axions and axion-like-particles with XENON100 experiment. The axion-electron coupling constant, $g_{Ae}$, has been probed by exploiting axio-electric effect in liquid xenon. A profile likelihood analysis 224.6 live days $\times$ 34 kg exposure shown no evidence a signal. By rejecting larger than $7.7 \times 10^{-12}$ (90\% CL) solar axion search, we set best limit to date on this coupling. In frame DFSZ KSVZ models, exclude QCD heavier 0.3...
EXO-200 is an experiment designed to search for double beta decay of $^{136}$Xe with a single-phase, liquid xenon detector. It uses active mass 110 kg enriched 80.6% in the isotope 136 ultra-low background time projection chamber capable simultaneous detection ionization and scintillation. This paper describes detector particular attention most innovative aspects design that revolve around reduction backgrounds, efficient use expensive isotopically xenon, optimization energy resolution...
We describe the concept and procedure of drifted-charge extraction developed in MicroBooNE experiment, a single-phase liquid argon time projection chamber (LArTPC). This technique converts raw digitized TPC waveform to number ionization electrons passing through wire plane at given time. A robust recovery from both induction collection anode planes will augment 3D reconstruction, is particularly important for tomographic reconstruction algorithms. building blocks overall are described. The...
We present several studies of convolutional neural networks applied to data coming from the MicroBooNE detector, a liquid argon time projection chamber (LArTPC). The algorithms studied include classification single particle images, localization and neutrino interactions in an image, detection simulated event overlaid with cosmic ray backgrounds taken real detector data. These demonstrate potential for identification or on interactions. also address technical issues that arise when applying...
The DUNE IDR describes the proposed physics program and technical designs of Far Detector modules in preparation for full TDR to be published 2019. It is intended as an intermediate milestone on path a TDR, justifying choices that flow down from high-level goals through requirements at all levels Project. These design will enable experiment make ground-breaking discoveries help answer fundamental questions. Volume 1 contains executive summary general aims this document. remainder first...
The single-phase liquid argon time projection chamber (LArTPC) provides a large amount of detailed information in the form fine-grained drifted ionization charge from particle traces. To fully utilize this information, deposited must be accurately extracted raw digitized waveforms via robust signal processing chain. Enabled by ultra-low noise levels associated with cryogenic electronics MicroBooNE detector, precise extraction induction wire planes LArTPC is qualitatively demonstrated on data...
The low-noise operation of readout electronics in a liquid argon time projection chamber (LArTPC) is critical to properly extract the distribution ionization charge deposited on wire planes TPC, especially for induction planes. This paper describes characteristics and mitigation observed noise MicroBooNE detector. MicroBooNE's single-phase LArTPC comprises two one collection sense plane with total 8256 wires. Current induced each TPC amplified shaped by custom low-power, ASICs immersed...
We have developed a convolutional neural network that can make pixel-level prediction of objects in image data recorded by liquid argon time projection chamber (LArTPC) for the first time. describe design, training techniques, and software tools to train this network. The goal work is develop complete deep based reconstruction chain MicroBooNE detector. show demonstration network's validity on real LArTPC using collection plane images. performed stopping muon...
The PICASSO collaboration observed for the first time a significant difference between acoustic signals induced by neutrons and alpha particles in detector based on superheated liquids. This new discovery offers possibility of improved background suppression could be especially useful dark matter experiments. effect may attributed to formation multiple bubbles tracks, compared single nucleations created neutron-induced recoils.
The low-background, VUV-sensitive 3-inch diameter photomultiplier tube R11410 has been developed by Hamamatsu for dark matter direct detection experiments using liquid xenon as the target material. We present results from joint effort between XENON collaboration and company to produce a highly radio-pure photosensor (version R11410-21) XENON1T experiment. After introducing its components, we show methods of radioactive contamination measurements individual materials employed in production....
ProtoDUNE-SP is the single-phase DUNE Far Detector prototype that under construction and will be operated at CERN Neutrino Platform (NP) starting in 2018. ProtoDUNE-SP, a crucial part of effort towards first 10-kt fiducial mass far detector module (17 kt total LAr mass), significant experiment its own right. With liquid argon (LAr) 0.77 kt, it represents largest monolithic LArTPC to built date. It's technical design given this report.
XENON is a dark matter direct detection project, consisting of time projection chamber (TPC) filled with liquid xenon as medium. The construction the next generation detector, XENON1T, presently taking place at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It aims sensitivity to spin-independent cross sections 2 · 10-47 c for WIMP masses around 50 GeV2, which requires background reduction by two orders magnitude compared XENON100, current detector. An active system that able tag muons...
We report the first measurement of double-differential and total muon neutrino charged current inclusive cross sections on argon at a mean energy 0.8 GeV. Data were collected using MicroBooNE liquid time projection chamber located in Fermilab Booster beam correspond to 1.6×10^{20} protons target exposure. The measured differential are presented as function momentum, multiple Coulomb scattering momentum technique, angle with respect direction. compare event generators find better agreement...
Laboratory experiments searching for galactic dark matter particles scattering off nuclei have so far not been able to establish a discovery. We use data from the XENON100 experiment search interacting with electrons. With no evidence signal above low background of our experiment, we exclude variety representative models that would induce electronic recoils. For axial-vector couplings electrons, cross-sections 6x10^(-35) cm^2 particle masses m_chi = 2 GeV/c^2. Independent halo, leptophilic...
The MicroBooNE liquid argon time projection chamber (LArTPC) has been taking data at Fermilab since 2015 collecting, in addition to neutrino beam, cosmic-ray muons. Results are presented on the reconstruction of Michel electrons produced by decay rest abundantly TPC, and given their well known energy spectrum can be used study MicroBooNE's detector response low-energy (electrons with energies up ~ 50 MeV). We describe fully-automated algorithm developed reconstruct electrons, which a sample...
A 10 kilo-tonne dual-phase liquid argon TPC is one of the detector options considered for Deep Underground Neutrino Experiment (DUNE). The technology relies on amplification ionisation charge in ultra-pure vapour and offers several advantages compared to traditional single-phase TPCs. 4.2 tonne prototype, largest its kind, with an active volume \three has been constructed operated at CERN. In this paper we describe detail experimental setup components as well report operation experience. We...
A detector based on doped silica and optical fibers was developed to monitor the profile of particle accelerator beams intensity ranging from 1 pA tens μA. Scintillation light produced in a fiber moving across beam is measured, giving information its position, shape intensity. The tested with continuous proton at 18 MeV Bern medical cyclotron used for radioisotope production multi-disciplinary research. For currents 20 μA, Ce3+ Sb3+ were as sensors. Read-out systems photodiodes,...