L. Bornschein
A5032460435- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Plasma Diagnostics and Applications
- Radiation Detection and Scintillator Technologies
- Semiconductor materials and interfaces
- Mass Spectrometry Techniques and Applications
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Ammonia Synthesis and Nitrogen Reduction
- Silicon and Solar Cell Technologies
- Atomic and Molecular Physics
- Thin-Film Transistor Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Laser Material Processing Techniques
- Advanced Chemical Physics Studies
- Noncommutative and Quantum Gravity Theories
- Magnetic confinement fusion research
- Advanced Surface Polishing Techniques
- Laser Design and Applications
Karlsruhe Institute of Technology
2014-2023
Robert Bosch (Germany)
2011-2013
Johannes Gutenberg University Mainz
1998-2005
Dubna State University
2002
University of Bonn
2001
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)...
With the compelling evidence for massive neutrinos from recent v-oscillation experiments, one of most fundamental tasks particle physics over next years will be determination absolute mass scale neutrinos. The value v-masses have crucial implications cosmology, astrophysics and physics. We present case a generation tritium β decay experiment to perform high precision direct measurement electron neutrino with sub-eV sensitivity. discuss experimental requirements technical challenges proposed...
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...
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...
The fact that neutrinos carry a non-vanishing rest mass is evidence of physics beyond the Standard Model elementary particles. Their absolute bears important relevance from particle to cosmology. In this work, we report on search for effective electron antineutrino with KATRIN experiment. performs precision spectroscopy tritium $\beta$-decay close kinematic endpoint. Based first five neutrino-mass measurement campaigns, derive best-fit value $m_\nu^{2} =...
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...
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 will determine the mass of electron neutrino with a sensitivity 0.2 eV (90% CL) via measurement β-spectrum gaseous tritium near its endpoint E0 = 18.57 keV. An ultra-low background about b 10 mHz is among requirements on reaching this sensitivity. In KATRIN main beam line, two spectrometers MAC-E filter type are used in tandem configuration. This setup, however, produces Penning trap, which could lead to increased background. We have...
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 experiment (KATRIN) aims to measure the effective electron anti-neutrino mass with an unprecedented sensitivity of 0.2 eV/c2, using β-electrons from tritium decay. electrons are guided magnetically by a system superconducting magnets through vacuum beamline windowless gaseous source differential and cryogenic pumping sections high resolution spectrometer segmented silicon pin detector. At same time gas has be prevented entering spectrometer. Therefore, have...