M. Kuźniak
A5076332700- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Particle Detector Development and Performance
- Advanced NMR Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Therapy and Dosimetry
- Cosmology and Gravitation Theories
- Diamond and Carbon-based Materials Research
- Radioactive Decay and Measurement Techniques
- Photocathodes and Microchannel Plates
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Spectroscopy and Laser Applications
- Magnetic confinement fusion research
- Medical Imaging Techniques and Applications
- Atmospheric Ozone and Climate
- Radioactivity and Radon Measurements
- Cold Fusion and Nuclear Reactions
- Age of Information Optimization
- Nuclear physics research studies
Nicolaus Copernicus Astronomical Center
2020-2024
Polish Academy of Sciences
2020-2024
University of Aveiro
2024
European Organization for Nuclear Research
2024
National Centre for Nuclear Research
2024
Carleton University
2014-2023
University of Cagliari
2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2023
University of California, Riverside
2023
Princeton University
2023
We present the result of an experiment to measure electric dipole moment (EDM) neutron at Paul Scherrer Institute using Ramsey's method separated oscillating magnetic fields with ultracold neutrons (UCN). Our measurement stands in long history EDM experiments probing physics violating time reversal invariance. The salient features this were use a Hg-199 co-magnetometer and array optically pumped cesium vapor magnetometers cancel correct for field changes. statistical analysis was performed...
DEAP-3600 is a single-phase liquid argon (LAr) direct-detection dark matter experiment, operating 2 km underground at SNOLAB (Sudbury, Canada). The detector consists of 3279 kg LAr contained in spherical acrylic vessel. This paper reports on the analysis $758\text{ }\text{ }\mathrm{tonne}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{day}$ exposure taken over period 231 live-days during first year operation. No candidate signal events are observed WIMP-search region interest, which...
This Letter reports the first results of a direct dark matter search with DEAP-3600 single-phase liquid argon (LAr) detector. The experiment was performed 2 km underground at SNOLAB (Sudbury, Canada) utilizing large target mass, LAr contained in spherical acrylic vessel 3600 kg capacity. is viewed by an array PMTs, which would register scintillation light produced rare nuclear recoil signals induced particle scattering. An analysis 4.44 live days (fiducial exposure 9.87 ton day) data taken...
Dark matter with Planck-scale mass (≃10^{19} GeV/c^{2}) arises in well-motivated theories and could be produced by several cosmological mechanisms. A search for multiscatter signals from supermassive dark was performed a blind analysis of data collected over 813 d live time DEAP-3600, 3.3 t single-phase liquid argon-based detector at SNOLAB. No candidate were observed, leading to the first direct detection constraints on matter. Leading limits constrain masses between 8.3×10^{6} 1.2×10^{19}...
In case a mirror world with copy of our ordinary particle spectrum would exist, the neutron n and its degenerate partner, n', could potentially mix undergo nn' oscillations. The interaction an magnetic field lift degeneracy between partners, diminish n' amplitude in wave function and, thus, suppress observability. We report experimental comparison ultracold storage trap without superimposed field. No influence is found assuming negligible fields, limit on oscillation time taunn' > 103 s (95%...
A clock comparison experiment, analyzing the ratio of spin precession frequencies stored ultracold neutrons and 199Hg atoms, is reported. No daily variation this could be found, from which set an upper limit on Lorentz invariance violating cosmic anisotropy field b perpendicular < 2 x 10(-20) eV (95% C.L.). This first for free neutron. result also interpreted as a direct gravitational dipole moment neutron |gn| 0.3 eV/c2 m spin-dependent interaction with Sun. Analyzing Earth, based previous...
The DEAP-3600 experiment is located 2 km underground at SNOLAB, in Sudbury, Ontario. It a single-phase detector that searches for dark matter particle interactions within 1000-kg fiducial mass target of liquid argon. A first generation prototype (DEAP-1) with 7-kg argon demonstrated high level pulse-shape discrimination (PSD) reducing β/γ backgrounds and helped to develop low radioactivity techniques mitigate surface-related α backgrounds. Construction the nearly complete commissioning...
The half-life of $^{39}$Ar is measured using the DEAP-3600 detector located 2 km underground at SNOLAB. In 2016-2020, used a target mass (3269 $\pm$ 24) kg liquid argon distilled from atmosphere in direct-detection dark matter search. Such an also enables direct measurements isotope properties. decay dominant source triggers by two orders magnitude, ensuring high statistics and making well-suited for measuring this isotope's half-life. Use pulse-shape discrimination technique allows powerful...
Abstract The knowledge of scintillation quenching $$\alpha $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>α</mml:mi> </mml:math> -particles plays a paramount role in understanding -induced backgrounds and improving the sensitivity liquid argon-based direct detection dark matter experiments. We performed relative measurement MeV energy region using radioactive isotopes ( $$^{222}$$ <mml:mmultiscripts> <mml:mrow/> <mml:mn>222</mml:mn> </mml:mmultiscripts> Rn, $$^{218}$$...
We performed ultracold neutron storage measurements to search for additional losses due (n) mirror-neutron (n′) oscillations as a function of an applied magnetic field B. In the presence mirror B′, would be maximal B≈B′. did not observe any indication nn′ and placed lower limit on oscillation time τnn′>12.0 s at 95% C.L. B′ between 0 12.5 μT.Received 26 May 2009DOI:https://doi.org/10.1103/PhysRevD.80.032003©2009 American Physical Society
DEAP-3600 is a single-phase liquid argon detector aiming to directly detect weakly interacting massive particles (WIMPs), located at SNOLAB (Sudbury, Canada). After analyzing data taken during the first year of operation, null result was used place an upper bound on WIMP-nucleon, spin-independent, isoscalar cross section. This study reinterprets this within nonrelativistic effective field theory framework and further examines how various possible substructures in local dark matter halo may...
SiPM-based readouts are becoming the standard for light detection in particle detectors given their superior resolution and ease of use with respect to vacuum tube photo-multipliers. However, contributions noise such as dark rate, cross-talk, after-pulsing (AP) may significantly impact performance. In this work, we present development highly reflective single-phase argon chambers capable displaying yields up 32 photo-electrons per keV, approximately 12 being primary generated by...
Both components of the transverse polarization electrons (sigmaT1, sigmaT2) emitted in beta-decay polarized, free neutrons have been measured. The T-odd, P-odd correlation coefficient quantifying sigmaT2, perpendicular to neutron and electron momentum, was found be R=0.008+/-0.015+/-0.005. This value is consistent with time reversal invariance significantly improves limits on relative strength imaginary scalar couplings weak interaction. obtained for associated sigmaT1,...
The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty 0.8 ppm. We employed apparatus where ultracold neutrons and mercury atoms are stored in same volume report result γn/γHg=3.8424574(30).
The DEAP-3600 experiment is searching for weakly interacting massive particles dark matter with a $\text{ }3.3\text{ }\ifmmode\times\else\texttimes\fi{}1{0}^{3}\text{kg}$ single phase liquid argon (LAr) target, located 2.1 km underground at SNOLAB. experimental signature of interactions kilo electron volt--scale $^{40}\mathrm{Ar}$ nuclear recoils producing 128 nm LAr scintillation photons observed by photomultiplier tubes. largest backgrounds in are electronic (ERs) induced...
Abstract The specific activity of the $$\beta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>β</mml:mi> </mml:math> decay $$^{39}$$ <mml:msup> <mml:mrow /> <mml:mn>39</mml:mn> </mml:msup> Ar in atmospheric argon is measured using DEAP-3600 detector. DEAP-3600, located 2 km underground at SNOLAB, uses a total (3269 ± 24) kg liquid distilled from atmosphere to search for dark matter. This detector well-suited measure owing its very low background levels. achieved two...
The idea of implementing electroluminescence-based amplification through transparent multi-hole structures (FAT-GEMs) has been entertained for some time. Arguably, such a technology to be attractive it should perform at least level comparable conventional alternatives based on wires or meshes. We present now detailed calorimetric study carried out 5.9 keV X-rays in xenon, pressures ranging from 2 10 bar, resorting different geometries, production and post-processing techniques. At reference...
Abstract The stability of a dark matter detector on the timescale few years is key requirement due to large exposure needed achieve competitive sensitivity. It especially crucial enable potentially detect any annual event rate modulation, an expected signature. In this work, we present performance history DarkSide-50 dual-phase argon time projection chamber over its almost three-year low-radioactivity run. particular, focus electroluminescence signal that enables sensitivity sub-keV energy...
Liquid argon-based scintillation detectors are important for dark matter searches and neutrino physics. Argon light is in the vacuum ultraviolet region, making it hard to be detected by conventional means. Polyethylene naphthalate (PEN), an optically transparent thermoplastic polyester commercially available as large area sheets or rolls, proposed alternative wavelength shifter commonly-used tetraphenyl butadiene (TPB). By combining existing literature data spectrometer measurements relative...
Abstract The DEAP-3600 detector searches for the scintillation signal from dark matter particles scattering on a 3.3 tonne liquid argon target. largest background comes $$^{39}\text{ Ar }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mrow/> <mml:mn>39</mml:mn> </mml:msup> <mml:mspace/> <mml:mtext>Ar</mml:mtext> </mml:mrow> </mml:math> beta decays and is suppressed using pulse-shape discrimination (PSD). We use two types of PSD estimator:...