C. Rodenbeck
A5015472009- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Particle accelerators and beam dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Plasma Diagnostics and Applications
University of Münster
2019-2023
Max Planck Institute for Nuclear Physics
2022
Karlsruhe Institute of Technology
2018-2019
Abstract Since the discovery of neutrino oscillations, we know that neutrinos have non-zero mass. However, absolute neutrino-mass scale remains unknown. Here report upper limits on effective electron anti-neutrino mass, m ν , from second physics run Karlsruhe Tritium Neutrino experiment. In this experiment, is probed via a high-precision measurement tritium β -decay spectrum close to its endpoint. This method independent any cosmological model and does not rely assumptions whether Dirac or...
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...
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} =...
We report the results of second measurement campaign Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes effective electron anti-neutrino mass, $m_{\nu}$, via a high-precision tritium $\beta$-decay spectrum close to its endpoint at $18.6\,\mathrm{keV}$. In physics run presented here, source activity was increased by factor 3.8 and background reduced $25\,\%$ with respect first campaign. A sensitivity on $m_{\nu}$ $0.7\,\mathrm{eV/c^2}$ $90\,\%$ confidence level (CL) reached. This...
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 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 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>...
With the KATRIN experiment, determination of absolute neutrino mass scale down to cosmologically favored values has come into reach. We show that this measurement provides missing link between Standard Model and dark sector in scotogenic models, where suppression masses is economically explained by their only indirect coupling Higgs field. determine linear relation electron scalar ${\ensuremath{\lambda}}_{5}$ associated with neutral splitting be...
The KATRIN experiment aims at measuring the electron neutrino mass with a sensitivity of 0.2 eV$/c^2$ after five years data taking. Recently new upper limit for 0.8 (90% CL) was obtained. To reach design sensitivity, reduction background rate by one order magnitude is required. shifted analysing plane (SAP) configuration exploits specific shaping electric and magnetic fields in main spectrometer to reduce factor two. We discuss general idea SAP describe features this novel measurement mode.
Abstract The Karlsruhe Tritium Neutrino Experiment (KATRIN) measures the effective electron anti-neutrino mass with an unprecedented design sensitivity of 0.2 eV (90 % C.L.). In this experiment, energy spectrum beta electrons near tritium decay endpoint is analyzed a highly accurate spectrometer. To reach KATRIN target, retarding voltage spectrometer must be stable to ppm (1 × 10 -6 ) level and well known on various time scales (μs up months), for values around -18.6 kV. A custom-designed...
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 neutrino mass experiment KATRIN uses conversion electrons from the 32.2 keV transition of nuclear isomer $^{\mathrm{83m}}$Kr for calibration. Comparing measured energies to appropriate literature values allows an independent evaluation energy scale, but uncertainties in some obtained by gamma spectroscopy are a limiting factor. Building upon already excellent linearity KATRIN's this paper proposes novel method determining via high-precision electron spectroscopy. Notably, makes use...