M. Fedkevych
A5038418058- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Superconducting and THz Device Technology
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Magnetic confinement fusion research
- Advanced Frequency and Time Standards
- Advanced Semiconductor Detectors and Materials
- Electron and X-Ray Spectroscopy Techniques
- Radioactive Decay and Measurement Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Plasma Diagnostics and Applications
- Gyrotron and Vacuum Electronics Research
- GaN-based semiconductor devices and materials
- Semiconductor materials and devices
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Semiconductor materials and interfaces
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2021-2023
University of Alabama
2022-2023
University of Genoa
2021-2022
Istituto Nazionale di Fisica Nucleare
2022
University of Münster
2016-2021
Karlsruhe Institute of Technology
2019
We report on the neutrino mass measurement result from first four-week science run of Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons a high-purity gaseous molecular tritium source are energy analyzed by high-resolution MAC-E filter. A fit integrated electron spectrum over narrow interval around kinematic endpoint at 18.57 keV gives an effective square value $(-1.0^{+0.9}_{-1.1})$ eV$^2$. From this we derive upper limit 1.1 eV (90$\%$ confidence level)...
The KArlsruhe TRItium Neutrino (KATRIN) experiment, which aims to make a direct and model-independent determination of the absolute neutrino mass scale, is complex experiment with many components. More than 15 years ago, we published technical design report (TDR) [https://publikationen.bibliothek.kit.edu/270060419] describe hardware requirements achieve our sensitivity goal 0.2 eV at 90% C.L. on mass. Since then there has been considerable progress, culminating in publication first results...
We report on the data set, handling, and detailed analysis techniques of first neutrino-mass measurement by Karlsruhe Tritium Neutrino (KATRIN) experiment, which probes absolute scale via $\beta$-decay kinematics molecular tritium. The source is highly pure, cryogenic T$_2$ gas. $\beta$ electrons are guided along magnetic field lines toward a high-resolution, integrating spectrometer for energy analysis. A silicon detector counts above threshold spectrometer, so that scan thresholds produces...
We report on the light sterile neutrino search from first four-week science run of KATRIN experiment in 2019. Beta-decay electrons a high-purity gaseous molecular tritium source are analyzed by high-resolution MAC-E filter down to 40 eV below endpoint at 18.57 keV. consider framework with three active neutrinos and one neutrino. The analysis is sensitive mass, ${m}_{4}$, fourth mass state for ${m}_{4}^{2}\ensuremath{\lesssim}1000\text{ }\text{ }{\mathrm{eV}}^{2}$ active-to-sterile mixing...
Abstract The determination of the neutrino mass is one major challenges in astroparticle physics today. Direct experiments, based solely on kinematics $$\upbeta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> -decay, provide a largely model-independent probe to scale. Karlsruhe Tritium Neutrino (KATRIN) experiment designed directly measure effective electron antineutrino with sensitivity $$0.2\hbox { eV}$$...
The Karlsruhe Tritium Neutrino (KATRIN) experiment is a large-scale effort to probe the absolute neutrino mass scale with sensitivity of 0.2 eV (90% confidence level), via precise measurement endpoint spectrum tritium β-decay. This work documents several KATRIN commissioning milestones: complete assembly experimental beamline, successful transmission electrons from three sources through beamline primary detector, and tests ion transport retention. In First Light campaign autumn 2016,...
The KATRIN experiment will probe the neutrino mass by measuring β-electron energy spectrum near endpoint of tritium β-decay. An integral analysis be performed an electro-static spectrometer (``Main Spectrometer''), ultra-high vacuum vessel with a length 23.2 m, volume 1240 m3, and complex inner electrode system about 120 000 individual parts. strong magnetic field that guides β-electrons is provided super-conducting solenoids at both ends spectrometer. Its influence on turbo-molecular pumps...
The KATRIN experiment aims for the determination of effective electron anti-neutrino mass from tritium beta-decay with an unprecedented sub-eV sensitivity. strong magnetic fields, designed up to 6~T, adiabatically guide $\beta$-electrons source detector within a flux 191~Tcm$^2$. A chain ten single solenoid magnets and two larger superconducting magnet systems have been designed, constructed, installed in 70-m-long beam line. diameter varies 0.064~m 9~m, depending on density along Two...
The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at − 18.6 kV main spectrometer. To monitor stability, two custom-made ultra-precise high-voltage dividers were developed and built in cooperation with German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). Until now, regular absolute calibration voltage required bringing equipment to specialised laboratory. Here we present new method based on measuring energy difference...
Abstract In this work, we present the first spectroscopic measurements of conversion electrons originating from decay metastable gaseous 83m Kr with Karlsruhe Tritium Neutrino (KATRIN) experiment. The obtained results represent one major commissioning milestones for subsequent direct neutrino mass measurement KATRIN. successful campaign demonstrates functionalities KATRIN beamline. Precise narrow K-32, L 3 -32, and N 2,3 -32 electron lines allowed to verify eV-scale energy resolution main...
The KArlsruhe TRItium Neutrino (KATRIN) experiment aims to make a model-independent determination of the effective electron antineutrino mass with sensitivity 0.2 eV/c$^{2}$. It investigates kinematics $\beta$-particles from tritium $\beta$-decay close endpoint energy spectrum. Because KATRIN main spectrometer (MS) is located above ground, muon-induced backgrounds are particular concern. Coincidence measurements MS and scintillator-based muon detector system confirmed model secondary...
Abstract The KATRIN experiment aims to measure the effective electron antineutrino mass $$m_{\overline{\nu }_e}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>m</mml:mi><mml:msub><mml:mover><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>e</mml:mi></mml:msub></mml:msub></mml:math> with a sensitivity of $${0.2}\,{\hbox {eV}/\hbox {c}^2}$$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mrow><mml:mn>0.2</mml:mn></mml:mrow><mml:mspace...
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims at measuring the effective electron neutrino mass with a sensitivity of 0.2 eV/c2, i.e., improving on previous measurements by an order magnitude. data taking KATRIN commenced in early 2019, and after only few weeks recording, analysis these showed success KATRIN, known limit factor about two. This very much could be ascribed to fact that most system components met, or even surpassed, required specifications during long-term operation....
Abstract The KArlsruhe TRItium Neutrino experiment (KATRIN) aims to determine the effective electron (anti)-neutrino mass with a sensitivity of 0.2eV/c $$^2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>2</mml:mn> </mml:msup> </mml:math> by precisely measuring endpoint region tritium $$\beta $$ <mml:mi>β</mml:mi> -decay spectrum. It uses tandem electrostatic spectrometers working as magnetic adiabatic collimation combined an (MAC-E) filters. In...
We present a novel technique, called DSVP (Discrimination through Singular Vectors Projections), to discriminate spurious events within dataset. The purpose of this paper is lay down general procedure which can be tailored for broad variety applications. After describing the concept, we apply algorithm problem identifying nearly coincident in low temperature microcalorimeters order push time resolution close its intrinsic limit. In fact, from simulated datasets it was possible achieve an...
The HOLMES experiment will perform a precise calorimetric measurement of the end point Electron Capture (EC) decay spectrum 163Ho in order to extract information on neutrino mass with sensitivity below 2 eV. In its final configuration, deploy 1000 detectors low-temperature microcalorimeters implanted nuclei. baseline sensors for are Mo/Cu TESs (Transition Edge Sensors) SiNx membrane gold absorbers. Considering large number pixels and an event rate about 300 Hz/pixel, multiplexing factor...
Iridium films grown by pulsed laser deposition (PLD) show different critical temperatures ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T<sub>c</sub></i> ), which can be almost twice the of bulk. This difference is related to thickness and conditions. To understand this effect, we grew with configuration parameters: focusing, distance Ir target, time. We then measured analyzed film structural measurements X-ray diffraction (XRD), looking...
The KATRIN experiment aims to determine the effective electron neutrino mass with a sensitivity of $0.2\,{\text{eV}/c^2}$ (90\% C.L.) by precision measurement shape tritium \textbeta-spectrum in endpoint region. energy analysis decay electrons is achieved MAC-E filter spectrometer. A common background source this setup short-lived isotopes, such as $\textsuperscript{219}$Rn and $\textsuperscript{220}$Rn, spectrometer volume. Active passive countermeasures have been implemented tested at main...
The 50 mK cryogenic focal plane anticoincidence detector of the Athena X-ray observatory (CryoAC) is a silicon-suspended absorber sensed by network 400 Ir/Au transition edge sensors (TES) and connected through silicon bridges to surrounding frame plated with gold. device shaped deep reactive ion etching from single wafer 500 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">μ</i> m. In operating test prototypes demonstration model CryoAC, we...
Abstract Spectrometers based on the magnetic adiabatic collimation followed by an electrostatic filter (MAC-E-filter) principle combine high angular acceptance with excellent energy resolution. These features make MAC-E-filters very valuable for experiments where kinetic of ions or electrons from rare processes has to be measured utmost sensitivity and precision. Examples are direct neutrino mass like KATRIN which investigate in endpoint region tritium $$\beta $$ <mml:math...
Precise knowledge of the energy and lifetime <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">229m</sup> Th isomeric state has notable importance as a basis for nuclear clock. Such clock would be capable to extend precision on oscillator frequency by up four orders magnitude compared presently best atomic clocks. However, technique proposed requires that is accessible with existing laser systems. Previous measurement placed this at ∼8 eV (150...