S. Schoppmann
A5019969240- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Nuclear physics research studies
- Cosmology and Gravitation Theories
- Noncommutative and Quantum Gravity Theories
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Quantum, superfluid, helium dynamics
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Luminescence Properties of Advanced Materials
- Quantum Mechanics and Applications
Johannes Gutenberg University Mainz
2022-2025
University of California, Berkeley
2021-2024
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2024
Max Planck Institute for Nuclear Physics
2017-2023
Lawrence Berkeley National Laboratory
2021-2023
Yale University
2022
Université Claude Bernard Lyon 1
2022
Centre National de la Recherche Scientifique
2022
Sorbonne Université
2022
Université Paris Cité
2022
The STEREO experiment is a very short baseline reactor antineutrino experiment. It designed to test the hypothesis of light sterile neutrinos being cause deficit observed interaction rate at baselines with respect predicted rate, known as anomaly. measures energy spectrum in six identical detector cells covering between 9 and 11 m from compact core ILL research reactor. In this article, results 179 days turned on 235 off are reported high degree detail. current include improvements modelling...
The reactor antineutrino anomaly might be explained by the oscillation of antineutrinos toward a sterile neutrino eV mass. In order to explore this hypothesis, STEREO experiment measures energy spectrum in six different detector cells covering baselines between 9 and 11 m from compact core ILL research reactor. Letter, results 66 days turned on 138 off are reported. A novel method extract rates has been developed based distribution pulse shape discrimination parameter. test new is performed...
The STEREO experiment is a very short baseline reactor antineutrino aiming at testing the hypothesis of light sterile neutrinos as an explanation deficit observed neutrino interaction rate with respect to predicted rate, known Reactor Antineutrino Anomaly. detector center located 10 m away from compact, highly 235U enriched core research nuclear Institut Laue Langevin in Grenoble, France. This paper describes site, components and associated shielding designed suppress external sources...
EOS is a technology demonstrator, designed to explore the capabilities of hybrid event detection technology, leveraging both Cherenkov and scintillation light simultaneously. With fiducial mass four tons, operate in high-precision regime, with sufficient size utilize time-of-flight information for full reconstruction, flexibility demonstrate range cutting edge technologies, simplicity design facilitate potential future deployment at alternative sites. Results from can inform neutrino...
Abstract Double beta plus decay is a rare nuclear disintegration process. Difficulties in its measurement arise from suppressed probabilities, experimentally challenging signatures and low natural abundances of suitable candidate nuclei. In this article, we propose new detector concept to overcome these challenges. It based on the first-time combination hybrid opaque scintillation technology paired with novel light read-out techniques. This approach particularly for detecting positrons (beta...
This article reports the measurement of $^{235}$U-induced antineutrino spectrum shape by STEREO experiment. 43'000 antineutrinos have been detected at about 10 m from highly enriched core ILL reactor during 118 full days equivalent nominal power. The measured inverse beta decay is unfolded to provide a pure $^{235}$U in energy. A careful study unfolding procedure, including cross-validation an independent framework, has shown that no major biases are introduced method. significant local...
Abstract In 1956 Reines & Cowan discovered the neutrino using a liquid scintillator detector. The neutrinos interacted with scintillator, producing light that propagated across transparent volumes to surrounding photo-sensors. This approach has remained one of most widespread and successful detection technologies used since. article introduces concept breaks conventional paradigm transparency by confining collecting near its creation point an opaque dense array optical fibres. technique,...
The PROSPECT and STEREO collaborations present a combined measurement of the pure ^{235}U antineutrino spectrum, without site specific corrections or detector-dependent effects. spectral measurements two highest precision experiments at research reactors are found to be compatible with χ^{2}/ndf=24.1/21, allowing joint unfolding prompt energy into energy. This ν[over ¯]_{e} spectrum is provided community, an excess events relative Huber model in 5-6 MeV region. When Gaussian bump fitted...
We report a measurement of the antineutrino rate from fission ^{235}U with STEREO detector using 119 days reactor turned on. In our analysis, we perform several detailed corrections and achieve most precise single at reactors highly enriched fuel. measure an IBD cross section per σ_{f}=(6.34±0.06[stat]±0.15[sys]±0.15[model])×10^{-43} cm^{2}/fission observe deficit (5.2±0.8[stat]±2.3[sys]±2.3[model])% compared to model, consistent world average. Testing as sole source deficit, find tension...
The electron antineutrino spectrum in the STEREO reactor experiment (ILL Grenoble) is measured via inverse beta decay signals an organic liquid scintillator. six target cells of detector are filled with about 1800 litres Gd-loaded scintillator optimised for requirements experiment. These surrounded by similar containing without Gd-loading. development and characteristics these scintillators reported. In particular, transparency, light production pulse shape discrimination capabilities...
Abstract. The STEREO experiment measures the electron antineutrino spectrum emitted in a research reactor using inverse beta decay reaction on H nuclei gadolinium loaded liquid scintillator. detection is based signal coincidence of prompt positron and delayed neutron capture event. simulated response crucial for comparison with data, particular case efficiency. Among all stable isotopes, 155 Gd 157 have highest cross sections thermal capture. excited after emit gamma rays total energy about...
Different extensions of the standard model particle physics, such as braneworld or mirror matter models, predict existence a neutron sterile state, possibly dark candidate. This Letter reports new experimental constraint on probability p for conversion into hidden neutron, set by STEREO experiment at high flux reactor Institut Laue-Langevin. The limit is p<3.1×10^{-11} 95% C.L. improving previous factor 13. result demonstrates that short-baseline neutrino experiments can be used competitive...
Organic liquid scintillators have been used for decades in many neutrino physics experiments. They are particularly suited the detection of low-energy neutrinos where energy and timing information is required. exhibit advantages such as high light yield, cost effectiveness, radio purity, more. However, they also entail disadvantages, most prominently a lack vertex resolution particle identification. In recent years, various novel ideas emerged to improve performance organic scintillators....
A study on cosmic muons has been performed for the two identical near and far neutrino detectors of Double Chooz experiment, placed at $\sim$120 $\sim$300 m.w.e. underground respectively, including corresponding simulations using MUSIC simulation package. This characterization allowed to measure muon flux reaching both be (3.64 $\pm$ 0.04) $\times$ 10$^{-4}$ cm$^{-2}$s$^{-1}$ detector (7.00 0.05) 10$^{-5}$ one. The seasonal modulation signal also studied observing a positive correlation with...
A: There is rising interest in organic scintillators with low scattering length for future neutrino detectors.Therefore, a new scintillator system was developed based on admixtures of paraffin wax linear alkyl benzene.The transparency and viscosity this gel-like material can be tuned by temperature adjustment.Whereas it colorless transparent liquid at temperatures around 40 • C, has milky structure below 20 C. The production properties such as well its advantages compared to liquids are described.
We present a search for signatures of neutrino mixing electron anti-neutrinos with additional hypothetical sterile flavors using the Double Chooz experiment. The is based on data from 5 years operation Chooz, including 2 in two-detector configuration. analysis profile likelihood, i.e.\ comparing to model prediction disappearance data-to-data comparison two respective detectors. optimized three active and one neutrino. It sensitive typical mass range $5 \cdot 10^{-3} $ eV$^2 \lesssim \Delta...
Double beta plus decay is a rare nuclear disintegration process. Difficulties in its measurement arise from suppressed probabilities, experimentally challenging signatures and low natural abundances of suitable candidate nuclei. In this article, we propose new detector concept to overcome these challenges. It based on the first-time combination hybrid opaque scintillation technology paired with novel light read-out techniques. This approach particularly detecting positrons (beta plus)...
For several decades now, scintillator detectors have found a wide range of applications in particle physics, including neutrino detection, the search for dark matter and even medical imaging. These so far strongly relied on transparency scintillating medium, through which light is typically propagated to surrounding photosensors. In this work, we present results 10 litre prototype based novel detection approach where an opaque medium used confine near its creation point that then collected...
Nuclear reactors are uniquely powerful, abundant, and flavor-pure sources of antineutrinos that continue to play a vital role in the US neutrino physics program. The reactor antineutrino community is diverse interest group encompassing many detection technologies particle topics, including Standard Model short-baseline oscillations, BSM searches, flux spectrum modeling. community's aims offer strong complimentary with numerous aspects wider program have direct relevance most topical...