Th. A. Mueller
A5023553062- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- High-Energy Particle Collisions Research
- Gamma-ray bursts and supernovae
- Muon and positron interactions and applications
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Noncommutative and Quantum Gravity Theories
- ZnO doping and properties
- Gallbladder and Bile Duct Disorders
- Magnetic and transport properties of perovskites and related materials
- Prostate Cancer Treatment and Research
- Advancements in Semiconductor Devices and Circuit Design
- Biliary and Gastrointestinal Fistulas
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
- Prostate Cancer Diagnosis and Treatment
- Pediatric Hepatobiliary Diseases and Treatments
Laboratoire Leprince-Ringuet
2016-2025
Centre National de la Recherche Scientifique
2015-2024
École Polytechnique
2015-2024
Sana Klinikum
2024
The University of Tokyo
2023-2024
Imperial College London
2024
Stratford University
2024
Colorado State University
2023
Duke University
2023
Universidad Autónoma de Madrid
2023
Recently new reactor antineutrino spectra have been provided for 235U, 239Pu, 241Pu and 238U, increasing the mean flux by about 3 percent. To good approximation, this reevaluation applies to all neutrino experiments. The synthesis of published experiments at reactor-detector distances <100 m leads a ratio observed event rate predicted 0.976(0.024). With our evaluation, shifts 0.943(0.023), leading deviation from unity 98.6% C.L. which we call anomaly. compatibility results with existence...
Precise predictions of the antineutrino spectra emitted by nuclear reactors is a key ingredient in measurements reactor neutrino oscillations as well recent applications to surveillance power plants context nonproliferation weapons. We report new calculations including latest information from databases and detailed error budget. The first part this work so-called ab initio approach where total spectrum built sum all $\ensuremath{\beta}$ branches fission products predicted an evolution code....
We have searched for proton decay via $p\to e^+\pi^0$ and \mu^+\pi^0$ modes with the enlarged fiducial volume data of Super-Kamiokande from April 1996 to May 2018, which corresponds 450 kton$\cdot$years exposure. accumulated about 25% more livetime detector 22.5 kton 27.2 this analysis, so that 144 data, including 78 additional has been newly analyzed. No candidates found one candidate remains in conventional it is consistent atmospheric neutrino background prediction. set lower limits on...
A new search for the diffuse supernova neutrino background (DSNB) flux has been conducted at Super-Kamiokande (SK), with a $22.5\times2970$-kton$\cdot$day exposure from its fourth operational phase IV. The analysis improves on existing reduction techniques and systematic uncertainties takes advantage of an improved neutron tagging algorithm to lower energy threshold compared previous phases SK. This allows setting world's most stringent upper limit extraterrestrial $\bar{\nu}_e$ flux,...
We report the first search result for flux of astrophysical electron antineutrinos energies O(10) MeV in gadolinium-loaded Super-Kamiokande (SK) detector. In June 2020, gadolinium was introduced to ultra-pure water SK detector order detect neutrons more efficiently. this new experimental phase, SK-Gd, we can via inverse beta decay with efficient background rejection and higher signal efficiency thanks high neutron tagging technique. paper, initial stage SK-Gd a $22.5\times552$ $\rm kton\cdot...
We report a search for cosmic-ray boosted dark matter with protons using the 0.37 megaton×years data collected at Super-Kamiokande experiment during 1996-2018 period (SKI-IV phase). searched an excess of proton recoils above atmospheric neutrino background from vicinity Galactic Center. No such is observed, and limits are calculated two reference models either constant interaction cross section or through scalar mediator. This first experimental hadrons directional information. The results...
An analysis of solar neutrino data from the fourth phase Super-Kamiokande (SK-IV) October 2008 to May 2018 is performed and results are presented. The observation time dataset SK-IV corresponds 2970 days total live for all four phases 5805 days. For more precise measurements, several improvements applied in this analysis: lowering acquisition threshold 2015, further reduction spallation background using neutron clustering events, energy reconstruction considering variation PMT gain. observed...
We present a measurement of neutrino oscillation parameters with the Super-Kamiokande detector using atmospheric neutrinos from complete pure-water SK I–V (April 1996–July 2020) dataset, including events an expanded fiducial volume. The dataset corresponds to 6511.3 live days and exposure 484.2 kiloton-years. Measurements <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi...
Originally designed as a new nuclear reactor monitoring device, the Nucifer detector has successfully detected its first neutrinos. We provide second-shortest baseline measurement of neutrino flux. The detection electron antineutrinos emitted in decay chains fission products, combined with core simulations, provides tool to assess both thermal power and fissile content whole could be used by International Agency for Atomic Energy enhance safeguards civil reactors. Deployed at only 7.2 m away...
The first loading of gadolinium (Gd) into Super-Kamiokande in 2020 was successful, and the neutron capture efficiency on Gd reached 50%. To further increase to 75%, 26.1 tons Gd2(SO4)3⋅8H2O additionally loaded (SK) from May 31 July 4, 2022. As amount doubled compared loading, capacity powder dissolving system doubled. We also developed new batches sulfate with even reduced radioactive impurities. In addition, a more efficient screening method devised implemented evaluate these...
Supernova detection is a major objective of the Super-Kamiokande (SK) experiment. In next stage SK (SK-Gd), gadolinium (Gd) sulfate will be added to detector, which improve ability detector identify neutrons. A core-collapse supernova preceded by an increasing flux neutrinos and anti-neutrinos, from thermal weak nuclear processes in star, over timescale hours; some may detected at SK-Gd. This could provide early warning imminent supernova, hours earlier than core collapse. Electron...
We present a search for an excess of neutrino interactions due to dark matter in the form weakly interacting massive particles (WIMPs) annihilating Galactic center or halo based on data set Super-Kamiokande-I, -II, -III and -IV taken from 1996 2016. model flux, energy, flavor distributions assuming WIMP self-annihilation is dominant $\ensuremath{\nu}\overline{\ensuremath{\nu}}$, ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, $b\overline{b}$, ${W}^{+}{W}^{\ensuremath{-}}$. The...
As a baryon number violating process with $\mathrm{\ensuremath{\Delta}}B=2$, neutron-antineutron oscillation ($n\ensuremath{\rightarrow}\overline{n}$) provides unique test of conservation. We have performed search for $n\ensuremath{\rightarrow}\overline{n}$ bound neutrons in Super-Kamiokande, the full dataset from its first four run periods, representing an exposure $0.37\text{ }\text{ }\mathrm{Mton}\text{\ensuremath{-}}\mathrm{years}$. The used multivariate analysis trained on simulated...
Among multi-messenger observations of the next galactic core-collapse supernova, Super-Kamiokande (SK) plays a critical role in detecting emitted supernova neutrinos, determining direction to (SN), and notifying astronomical community these advance optical signal. On 2022, SK has increased gadolinium dissolved its water target (SK-Gd) achieved Gd concentration 0.033%, resulting enhanced neutron detection capability, which turn enables more accurate determination direction. Accordingly,...
We report the results of a neutrino search in Super-Kamiokande for coincident signals with first detected gravitational wave produced by binary neutron star merger, GW170817, which was followed short gamma-ray burst, GRB170817A, and kilonova/macronova. searched events range from 3.5 MeV to $\sim$100 PeV, time window $\pm$500 seconds around detection time, as well during 14-day period after detection. No significant signal observed either window. calculated 90% confidence level upper limits...
A new event reconstruction algorithm based on a maximum likelihood method has been developed for Super-Kamiokande. Its improved kinematic and particle identification capabilities enable the analysis of atmospheric neutrino data in detector volume 32% larger than previous analyses increases sensitivity to mass hierarchy. Analysis 253.9 kton-year exposure Super-Kamiokande IV yielded weak preference normal hierarchy, disfavoring inverted hierarchy at 74% assuming oscillations best fit analysis.
The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric beam data. It uses common interaction model for events overlapping in energy correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days data exposure <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>19.7</a:mn><a:mo stretchy="false">(</a:mo><a:mn>16.3</a:mn><a:mo...
We searched for proton decay via $p\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{K}^{0}$ in $0.37\text{ }\text{ }\mathrm{Mton}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{years}$ of data collected between 1996 and 2018 from the Super-Kamiokande water Cherenkov experiment. The selection criteria were defined separately ${K}_{S}^{0}$ ${K}_{L}^{0}$ channels. No significant event excess has been observed. As a result this analysis, which extends previous search by an additional $0.2\text{...
We report the first measurement of atmospheric neutrino-oxygen neutral-current quasielastic (NCQE) cross section in gadolinium-loaded Super-Kamiokande (SK) water Cherenkov detector. In June 2020, SK began a new experimental phase, named SK-Gd, by loading 0.011% mass gadolinium into ultrapure The introduction to has effect improving neutron-tagging efficiency. Using 552.2 day dataset from August 2020 2022, we measure NCQE be <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
Abstract The Super-Kamiokande detector can be used to search for neutrinos in time coincidence with gravitational waves detected by the LIGO–Virgo Collaboration (LVC). Both low-energy (7–100 MeV) and high-energy (0.1–10 5 GeV) samples were analyzed order cover a very wide neutrino spectrum. Follow-ups of 36 (out 39) reported GWTC-2 catalog examined; no significant excess above background was observed, 10 (24) observed compared 4.8 (25.0) expected events (low-energy) samples. A statistical...
Neutral current (NC) interactions of atmospheric neutrinos on oxygen form one the major backgrounds in search for supernova relic with water-based Cherenkov detectors. The NC channel is dominated by neutrino quasi-elastic (NCQE) scattering off nucleons inside $^{16}$O nuclei. In this paper we report first measurement NCQE cross section using at Super-Kamiokande (SK). used 2,778 live days SK-IV data a fiducial volume 22.5 kiloton water. Within visible energy window 7.5-29.5 MeV, observed...
Abstract Super-Kamiokande has been searching for neutrino bursts characteristic of core-collapse supernovae continuously, in real time, since the start operations 1996. The present work focuses on detecting more distant whose event rate may be too small to trigger but identified using an offline approach. analysis data collected from 2008 2018 found no evidence bursts. This establishes upper limit 0.29 yr −1 out 100 kpc at 90% C.L. For that fail explode and collapse directly black holes...
We report a search for time variations of the solar <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mmultiscripts><a:mrow><a:mi mathvariant="normal">B</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>8</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> neutrino flux using 5804 live days Super-Kamiokande data collected between May 31, 1996, and 30, 2018. measured precise each interaction over 22 calendar years to modulations with unprecedented precision....
Radioactivity induced by cosmic muon spallation is a dominant source of backgrounds for <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi mathvariant="script">O</a:mi><a:mo stretchy="false">(</a:mo><a:mn>10</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>MeV</a:mi><a:mo stretchy="false">)</a:mo></a:mrow></a:math> neutrino interactions in water Cherenkov detectors. In particular, it crucial to reduce measure the solar spectrum and find from distant...