A5072683333- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Muon and positron interactions and applications
- Dark Matter and Cosmic Phenomena
- Ion-surface interactions and analysis
- Nuclear Physics and Applications
- Fusion materials and technologies
- Graphene research and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Noncommutative and Quantum Gravity Theories
- Plasma Diagnostics and Applications
- Heat Transfer and Boiling Studies
- Cold Fusion and Nuclear Reactions
- Chemical Reactions and Isotopes
- Engineering Applied Research
- Radiation Effects in Electronics
- Atmospheric chemistry and aerosols
- Particle Detector Development and Performance
- Ammonia Synthesis and Nitrogen Reduction
- Advanced Data Storage Technologies
- Particle accelerators and beam dynamics
- Electron and X-Ray Spectroscopy Techniques
Karlsruhe Institute of Technology
2019-2025
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)...
That neutrinos carry a nonvanishing rest mass is evidence of physics beyond the Standard Model elementary particles. Their absolute holds relevance in fields from particle to cosmology. We report on search for effective electron antineutrino with KATRIN experiment. performs precision spectroscopy tritium β-decay close kinematic endpoint. On basis first five measurement campaigns, we derived best-fit value <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow>...
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 present the results of light sterile neutrino search from second KATRIN measurement campaign in 2019. Approaching nominal activity, $3.76 \times 10^6$ tritium $\beta$-electrons are analyzed an energy window extending down to $40\,$eV below endpoint at $E_0 = 18.57\,$keV. consider $3\nu+1$ framework with three active and one flavor. The analysis is sensitive a fourth mass eigenstate $m_4^2\lesssim1600\,$eV$^2$ active-to-sterile mixing $|U_{e4}|^2 \gtrsim 6 10^{-3}$. As no sterile-neutrino...
We report on the direct search for cosmic relic neutrinos using data acquired during first two science campaigns of KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by high-resolution MAC-E filter around end point at 18.57 keV. The analysis is sensitive to local neutrino overdensity ratio η<9.7×10^{10}/α (1.1×10^{11}/α) 90% (95%) confidence level with α=1 (0.5) Majorana (Dirac) neutrinos. A fit integrated electron spectrum over...
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 $$0.2\hbox { eV}$$...
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 We report the results of second measurement campaign Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes effective electron anti-neutrino mass, m ν , via a high-precision tritium β-decay spectrum close to its endpoint at 18.6 keV. In physics run presented here, source activity was increased by factor 3.8 and background reduced 25% with respect first campaign. A sensitivity on 0.7 eV/c 2 90% confidence level (CL) reached. This is sub-eV from direct neutrino-mass The best...
As surfaces are exposed to tritium, they will inevitably accumulate it, leading the tritium memory effect. In order reduce this effect, e.g. in analytic systems, decontamination methods required. UV/ozone is known be an efficient method, but its fundamental mechanism not well known. a dedicated UHV-compatible experiment, method investigated systematically. This work focuses on pressure dependent ozone production and depletion rates, as equilibrium concentration. All three properties showed...
Some extensions of the Standard Model Particle Physics allow for Lorentz invariance and Charge-Parity-Time (CPT)-invariance violations. In neutrino sector strong constraints have been set by neutrino-oscillation time-of-flight experiments. However, some Lorentz-invariance-violating parameters are not accessible via these probes. this work, we focus on $(a_{\text{of}}^{(3)})_{00}$, $(a_{\text{of}}^{(3)})_{10}$ $(a_{\text{of}}^{(3)})_{11}$ which would manifest themselves in a non-isotropic...
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 KATRIN experiment is designed for a direct and model-independent determination of the effective electron anti-neutrino mass via high-precision measurement tritium $$\upbeta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>β</mml:mi> </mml:math> -decay endpoint region with sensitivity on $$m_\nu <mml:msub> <mml:mi>m</mml:mi> <mml:mi>ν</mml:mi> </mml:msub> 0.2 $$\hbox {eV}/\hbox {c}^2$$ <mml:mrow> <mml:mtext>eV</mml:mtext> <mml:mo>/</mml:mo> <mml:msup>...
Abstract The KArlsruhe TRItium Neutrino experiment (KATRIN) aims to determine the effective electron (anti)-neutrino mass with a sensitivity of 0.2eV/c $$^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...
Abstract The projected sensitivity of the effective electron neutrino-mass measurement with KATRIN experiment is below 0.3 eV (90 % CL) after 5 years data acquisition. affected by increased rate background electrons from KATRIN’s main spectrometer. A special shifted-analysing-plane (SAP) configuration was developed to reduce this a factor two. complex layout electromagnetic fields in SAP requires robust method estimating these fields. We present paper dedicated calibration using conversion...
The KArlsruhe TRItium Neutrino (KATRIN) collaboration aims to determine the neutrino mass with a sensitivity of 0.2 eV/c2 (90% confidence level). This will be achieved by probing end-point region β-electron spectrum gaseous tritium an electrostatic spectrometer. A gold-coated stainless steel disk defines reference potential for high-precision measurement, and it terminates flux as physical boundary source. so-called rear wall is exposed tritium, which leads adsorption absorption. in turn...
Beta-induced X-ray spectrometry (BIXS) is a promising method for activity monitoring of tritiated gas species. BIXS systems measure bremsstrahlung and characteristic X-rays generated by interactions beta decay electrons with surfaces within the measurement chamber. other highly sensitive methods such as ionization counting are limited in accuracy tritium memory effect, preconditioning dependent background signal caused sorption on surfaces. In this work, different surface materials have been...
In this work, we report on studies of graphene exposed to tritium gas in a controlled environment. The single layer SiO
In this work, we report on studies of graphene exposed to tritium gas in a controlled environment. The single layer $\textrm{SiO}_2$/Si substrate was 400 mbar $\textrm{T}_2$ for total time $\approx$ 55 h. resistivity the sample measured $\textit{in situ}$ during exposure using Van der Pauw method. We found that sheet resistance increases by three orders magnitude exposure, suggesting significant chemisorption tritium. After samples were characterised $\textit{ex via spatio-chemical mapping...