A. Marsteller
A5088434832- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Fusion materials and technologies
- Atomic and Subatomic Physics Research
- Electron and X-Ray Spectroscopy Techniques
- Magnetic confinement fusion research
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- nanoparticles nucleation surface interactions
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Spacecraft and Cryogenic Technologies
- Ammonia Synthesis and Nitrogen Reduction
- Atomic and Molecular Physics
- ZnO doping and properties
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Data Storage Technologies
University of Washington
2022-2025
Karlsruhe Institute of Technology
2018-2025
Johannes Gutenberg University Mainz
2023-2024
Washington Center
2023
University of Konstanz
2015
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...
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 absolute scale of the neutrino mass plays a critical role in physics at every scale, from subatomic to cosmological. Measurements tritium end-point spectrum have provided most precise direct limit on scale. In this Letter, we present advances by Project 8 cyclotron radiation emission spectroscopy (CRES) technique culminating first frequency-based limit. With only cm^{3}-scale physical detection volume, m_{β}<155 eV/c^{2} (152 eV/c^{2}) is extracted background-free measurement continuous...
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 Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region T 2 β decay, with primary goal probing absolute mass scale neutrino. After first tritium commissioning campaign in 2018, has been regularly running since 2019, and its two measurement campaigns already achieved sub-eV sensitivity. 1000 days data-taking, KATRIN’s design sensitivity 0.2 eV at 90% confidence level. In this white paper we describe current...
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 $$0.2\hbox { eV}$$...
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 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...
Neutrino mass is a key parameter in nuclear and particle physics cosmology. The Project 8 Collaboration developed an innovative method with potential to improve the current limits by more than order of magnitude. Announced paper published last September (PRL 131, 102502; see also Synopsis at https://physics.aps.org/articles/v16/s121), measures frequency radiation from tritium $\ensuremath{\beta}$-decay electrons spiraling magnetic field. In authors provide details this unique measurement...
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,...
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...
A calorimetric detector for minimally disruptive measurements of atomic hydrogen beams is described. The calorimeter measures heat released by the recombination atoms into molecules on a thin wire. As demonstration, angular distribution beam with peak intensity $\approx 10^{16} \,{\rm{atoms}}/{(\rm{cm}^2 \rm{s})}$ measured translating wire across beam. data agree well an analytic model from thermal atom source. Using shape model, relative can be determined to 5% precision or better at any angle.
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...
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 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...
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...
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>...