A5048369619- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Radiopharmaceutical Chemistry and Applications
- Particle Detector Development and Performance
- Radioactive Decay and Measurement Techniques
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Medical Imaging Techniques and Applications
- Radioactive contamination and transfer
- Atmospheric Ozone and Climate
- Radiation Therapy and Dosimetry
- Spacecraft and Cryogenic Technologies
- Radioactivity and Radon Measurements
- Superconducting Materials and Applications
- Inorganic Fluorides and Related Compounds
- Galaxies: Formation, Evolution, Phenomena
- Physics of Superconductivity and Magnetism
- Geomagnetism and Paleomagnetism Studies
- Noncommutative and Quantum Gravity Theories
University of Hawaii–West Oahu
2025
University of Hawaii System
2023-2024
University of Zurich
2020-2023
D. Mendeleyev University of Chemical Technology of Russia
2023
Uzhhorod National University
2023
University of Hawaiʻi at Mānoa
2023
Pacific Northwest National Laboratory
2023
Max Planck Institute for Gravitational Physics
2020
Max Planck Society
2020
Ricardo AEA (Germany)
2000
Magnetic field and plasma data, obtained by the Helios 1 2 spacecraft in solar wind near 0.3 AU during years 1975 to 1976, have been analyzed calculating 12 kinds of spectra related Elsässer variables, δ Z + = V A , − where are bulk velocity Alfvén fluctuations, respectively. For small amplitude waves fluctuation variable simply relates outward propagation an inward sense propagation, if ambient magnetic B 0 is directed inward. The frequency range analysed this paper 6×10 −6 Hz −3 Hz. It...
Abstract The DARWIN observatory is a proposed next-generation experiment to search for particle dark matter and the neutrinoless double beta decay of $$^{136}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>136</mml:mn> </mml:msup> </mml:math> Xe. Out its 50 t total natural xenon inventory, 40 will be active target time projection chamber which thus contains about 3.6 Here, we show that projected half-life sensitivity $$2.4\times {10}^{27}\,{\hbox...
Abstract For the first time, a small dual-phase (liquid/gas) xenon time projection chamber was equipped with top array of silicon photomultipliers for light and charge readout. Here we describe instrument in detail, as well data processing event position reconstruction algorithms. We obtain spatial resolution $$\sim 1.5\,\text {mm}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>∼</mml:mo><mml:mn>1.5</mml:mn><mml:mspace...
Abstract The DARWIN observatory is a proposed next-generation experiment to search for particle dark matter and other rare interactions. It will operate 50 t liquid xenon detector, with 40 in the time projection chamber (TPC). To inform final detector design technical choices, series of technological questions must first be addressed. Here we describe full-scale demonstrator vertical dimension, Xenoscope, main goal achieving electron drift over 2.6 m distance, which scale TPC. We have...
Abstract The DARWIN observatory is a proposed next-generation experiment with 40 tonnes of liquid xenon as an active target in time projection chamber. To study challenges related to the construction and operation multi-tonne scale detector, we have designed constructed vertical, full-scale demonstrator for at University Zurich. Here, present first results from several-months run $$343\,\hbox {kg}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>343</mml:mn>...
Abstract Detectors using liquid xenon as target are widely deployed in rare event searches. Conclusions on the interacting particle rely a precise reconstruction of deposited energy which requires calibrations scale detector by means radioactive sources. However, microscopic calibration, i.e. translation from number excitation quanta into energy, also necessitates good knowledge required to produce single scintillation photons or ionisation electrons xenon. The sum these is directly...
Helios observations are used to determine and compare the average temperature gradients of protons alpha particles in solar wind between 0.3 1 AU. The He 2+ ions found cool off more slowly than adiabatically. radial profiles their somewhat steeper fast slow wind, a result which is contrast proton results. These situ measurements extrapolated inside AU order estimate T α there required heating rates. Thereby, adjusted match coronal boundary values. Clear evidence for continuous interplanetary...
Understanding propagation of scintillation light is critical for maximizing the discovery potential next-generation liquid xenon detectors that use dual-phase time projection chamber technology. This work describes a detailed optical simulation DARWIN detector implemented using Chroma, GPU-based photon tracking framework. To evaluate framework and to explore ways efficiency minimizing collection, we simulate several variations conventional design. Results these selected studies are...
Liquid argon detectors rely on wavelength shifters for efficient detection of scintillation light. The current standard is tetraphenyl butadiene (TPB), but it challenging to instrument a large scale. Poly(ethylene 2,6-naphthalate) (PEN), polyester easily manufactured as thin sheets, could simplify the coverage surfaces with shifters. Previous measurements have shown that commercial grades PEN approximately 50% light conversion efficiency relative TPB. Encouraged by these results, we...
Benefiting from more than a decade of experience in WIMP searches with dual-phase xenon time projection chambers, the DARWIN (DARk matter WImp search liquid xenoN) collaboration intends to build next-generation detector involving 50 tonnes (40 active) xenon. The primary goal observatory is explore entire experimentally accessible parameter space for masses above 5 GeV/c$^{2}$ down irreducible neutrino floor. With its low energy threshold and ultra-low background level, will be an excellent...
The DARWIN observatory is a proposed next-generation experiment to search for particle dark matter and the neutrinoless double beta decay of $^{136}$Xe. Out its 50$\,$t total natural xenon inventory, 40$\,$t will be active target time projection chamber which thus contains about 3.6 t Here, we show that projected half-life sensitivity $2.4\times10^{27}\,$yr, using fiducial volume 5t 10$\,$yr operation with background rate less than 0.2$~$events/(t$\cdot$yr) in energy region interest. This...
This manuscript provides a characterisation of the equivalence class classical smooth Lagrangian densities that involve terms depending on two distinct points underlying Euclidean base space theory. Theories this type are referred to as non-local field theories, which particular interest in group theory approach quantum gravity. The notion is set by physical indistinguishability means their equations motion whose derivation shown briefly. We expect our results give more comprehensive view...
Es wird eine Methode zur Bestimmung von geringen 131J-Verunreinigungen in 99Mo vorgestellt. Infolge gut bekannter Zerfallsschemata beider Nuklide läβt sich ein Peak-Auswertung trotz spektromelrisch nicht trennbarer Energielinien durchführen. Die ist bis zu Verunreinigungen 0,05% hinreichend genau.
Es wird eine einfache Methode zur Grobbestimmung der 131J-Kontamination des Eluates von 99mTc-Generatoren auf (n,f)-99Mo-Basis an Isotopencalibratoren vorgestellt. Aus Untersuchung mehr als 650 Generatoren wurde entwickelt, die es gestattet, 131J-Verunreinigungen mit einem Fehler ca. 25% zu bestimmen.