M. Schümann
A5078694865- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Astrophysics and Cosmic Phenomena
- Radioactivity and Radon Measurements
- Advanced Chemical Physics Studies
- Scientific Research and Discoveries
- High-Energy Particle Collisions Research
- Radioactive Decay and Measurement Techniques
- Astro and Planetary Science
- Quantum Electrodynamics and Casimir Effect
- Quantum Mechanics and Applications
- Pulsars and Gravitational Waves Research
- Radioactive contamination and transfer
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Atmospheric Ozone and Climate
University of Fribourg
2024-2025
University of Freiburg
2016-2024
Xenon Pharmaceuticals (Canada)
2023-2024
Charité - Universitätsmedizin Berlin
2020-2024
Helmut Schmidt University
2024
University of Zurich
2010-2023
Karlsruhe Institute of Technology
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2023
University of Bern
2013-2022
Franklin University
2021
We report on a search for weakly interacting massive particles (WIMPs) using 278.8 days of data collected with the XENON1T experiment at LNGS. utilizes liquid xenon time projection chamber fiducial mass (1.30±0.01) ton, resulting in 1.0 ton yr exposure. The energy region interest, [1.4,10.6] keV_{ee} ([4.9,40.9] keV_{nr}), exhibits an ultralow electron recoil background rate [82_{-3}^{+5}(syst)±3(stat)] events/(ton keV_{ee}). No significant excess over is found, and profile likelihood...
We report on a search for particle dark matter with the XENON100 experiment, operated at Laboratori Nazionali del Gran Sasso 13 months during 2011 and 2012. features an ultralow electromagnetic background of (5.3 ± 0.6) × 10(-3) events/(keV(ee) kg day) in energy region interest. A blind analysis 224.6 live days 34 exposure has yielded no evidence interactions. The two candidate events observed predefined nuclear recoil range 6.6-30.5 keV(nr) are consistent expectation (1.0 0.2) events....
We present results from the direct search for dark matter with XENON100 detector, installed underground at Laboratori Nazionali del Gran Sasso of INFN, Italy. is a two-phase time projection chamber 62 kg liquid xenon target. Interaction vertex reconstruction in three dimensions millimeter precision allows to select only innermost 48 as ultra-low background fiducial In 100.9 live days data, acquired between January and June 2010, no evidence found. Three candidate events were observed...
DARk matter WImp search with liquid xenoN (DARWIN) will be an experiment for the direct detection of dark using a multi-ton xenon time projection chamber at its core. Its primary goal to explore experimentally accessible parameter space Weakly Interacting Massive Particles (WIMPs) in wide mass-range, until neutrino interactions target become irreducible background. The prompt scintillation light and charge signals induced by particle observed VUV sensitive, ultra-low background photosensors....
The XENON1T experiment is currently in the commissioning phase at Laboratori Nazionali del Gran Sasso, Italy. In this article we study experiment's expected sensitivity to spin-independent WIMP-nucleon interaction cross section, based on Monte Carlo predictions of electronic and nuclear recoil backgrounds. total background $1$ tonne fiducial volume ($1$, $12$) keV equivalent energy region, before applying any selection discriminate between recoils, $(1.80 \pm 0.15) \cdot 10^{-4}$ ($\rm{kg}...
The existence of dark matter as evidenced by numerous indirect observations is one the most important indications that there must be physics beyond Standard Model particle physics. This article reviews concepts direct detection in form Weakly Interacting Massive Particles (WIMPs) ultra-sensitive detectors located underground laboratories, discusses expected signatures, detector concepts, and how stringent low-background requirements are achieved. Finally, it summarizes current status field...
The XENON100 experiment, in operation at the Laboratori Nazionali del Gran Sasso Italy, is designed to search for dark matter WIMPs scattering off 62 kg of liquid xenon an ultra-low background dual-phase time projection chamber. In this letter, we present first results from analysis 11.17 live days non-blind data, acquired October and November 2009. selected fiducial target 40 kg, within pre-defined signal region, observe no events hence exclude spin-independent WIMP-nucleon elastic...
We present new experimental constraints on the elastic, spin-dependent WIMP-nucleon cross section using recent data from XENON100 experiment, operated in Laboratori Nazionali del Gran Sasso Italy. An analysis of 224.6 live days×34 kg exposure acquired during 2011 and 2012 revealed no excess signal due to axial-vector WIMP interactions with 129Xe 131Xe nuclei. This leads most stringent upper limits WIMP-neutron sections for masses above 6 GeV/c², a minimum 3.5×10(-40) cm² at mass 45 90%...
We report on a new measurement of the neutron $\ensuremath{\beta}$-asymmetry parameter $A$ with instrument Perkeo II. The main enhancements are high polarization $P=99.7(1)%$ from novel arrangement supermirror polarizers and reduced background improvements in beam line shielding. leading corrections were thus by factor 4, pushing them below level statistical error resulting significant reduction systematic uncertainty compared to our previous experiments. derive...
We present the first results of searches for axions and axion-like-particles with XENON100 experiment. The axion-electron coupling constant, $g_{Ae}$, has been probed by exploiting axio-electric effect in liquid xenon. A profile likelihood analysis 224.6 live days $\times$ 34 kg exposure shown no evidence a signal. By rejecting larger than $7.7 \times 10^{-12}$ (90\% CL) solar axion search, we set best limit to date on this coupling. In frame DFSZ KSVZ models, exclude QCD heavier 0.3...
Many experiments that aim at the direct detection of Dark Matter are able to distinguish a dominant background from expected feeble signals, based on some measured discrimination parameter. We develop statistical model for such using Profile Likelihood ratio as test statistic in frequentist approach. take data calibrations control measurements signal and background, method allows inclusion Monte Carlo simulations. Systematic detector uncertainties, uncertainties energy scale, well...
We report on WIMP search results of the XENON100 experiment, combining three runs summing up to 477 live days from January 2010 2014. Data first two were already published. A blind analysis was applied last run recorded between April 2013 and 2014 prior results. The ultra-low electromagnetic background ~$5 \times 10^{-3}$ events/(keV$_{\mathrm{ee}}\times$kg$\times$day) before electronic recoil rejection, together with increased exposure 48 kg $\times$ yr improves sensitivity. profile...
We perform a low-mass dark matter search using an exposure of $30\text{ }\text{ }\mathrm{kg}\ifmmode\times\else\texttimes\fi{}\mathrm{yr}$ with the XENON100 detector. By dropping requirement scintillation signal and only ionization to determine interaction energy, we lowered energy threshold for detection 0.7 keV nuclear recoils. No can be claimed because complete background model cannot constructed without primary signal. Instead, compute upper limit on WIMP-nucleon scattering cross section...
We study the sensitivity of multi ton-scale time projection chambers using a liquid xenon target, e.g., proposed DARWIN instrument, to spin-independent and spin-dependent WIMP-nucleon scattering interactions. Taking into account realistic backgrounds from detector itself as well neutrinos, we examine impact exposure, energy threshold, background rejection efficiency resolution on dark matter sensitivity. With an exposure 200 t × y assuming parameters which have been already demonstrated...
A bstract We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part CERN Solar Telescope (CAST), searching for axion dark matter in 34.67 μ eV mass range. radio frequency cavity consisting 5 sub-cavities coupled by inductive irises took physics data inside CAST dipole magnet first time using this filter-like haloscope geometry. An exclusion limit with 95% credibility level on axion-photon coupling constant g aγ ≳ 4 × 10 − 13 GeV 1 over range 34 ....
The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in 19.74 $\mu$eV to 22.47 mass range. detection concept follows Sikivie haloscope principle, where Dark Matter convert into photons within a resonator immersed magnetic field. is an array of four individual rectangular cavities inserted strong phase-matched maximize sensitivity. Here we report on data acquired 4124 h from 2019 2021. Each cavity equipped with fast frequency tuning mechanism...
The low-background, VUV-sensitive 3-inch diameter photomultiplier tube R11410 has been developed by Hamamatsu for dark matter direct detection experiments using liquid xenon as the target material. We present results from joint effort between XENON collaboration and company to produce a highly radio-pure photosensor (version R11410-21) XENON1T experiment. After introducing its components, we show methods of radioactive contamination measurements individual materials employed in production....
XENON is a dark matter direct detection project, consisting of time projection chamber (TPC) filled with liquid xenon as medium. The construction the next generation detector, XENON1T, presently taking place at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It aims sensitivity to spin-independent cross sections 2 · 10-47 c for WIMP masses around 50 GeV2, which requires background reduction by two orders magnitude compared XENON100, current detector. An active system that able tag muons...
We report on a search for electronic recoil event rate modulation signatures in the XENON100 data accumulated over period of 4 years, from January 2010 to 2014. A profile likelihood method, which incorporates stability detector and known background model, is used quantify significance periodicity time distribution events. There weak signature at $431^{+16}_{-14}$ days low energy region $(2.0-5.8)$ keV single scatter sample, with global $1.9\,\sigma$, however no other more significant...
Abstract The DARWIN observatory is a proposed next-generation experiment to search for particle dark matter and the neutrinoless double beta decay of $$^{136}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>136</mml:mn> </mml:msup> </mml:math> Xe. Out its 50 t total natural xenon inventory, 40 will be active target time projection chamber which thus contains about 3.6 Here, we show that projected half-life sensitivity $$2.4\times {10}^{27}\,{\hbox...
The depopulation of the quasistable isomer in ${}^{180}\mathrm{Ta}$ with ${J}^{\ensuremath{\pi}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}9}^{\ensuremath{-}}$ at ${E}_{x}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}75\mathrm{keV}$ by resonant photoabsorption was investigated intense bremsstrahlung. results indicate a dramatic acceleration decay to short-lived ${J}^{\ensuremath{\pi}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1}^{+}$ ground state under stellar...