P. Mijakowski
A5107836959- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- CCD and CMOS Imaging Sensors
- Methane Hydrates and Related Phenomena
- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Noncommutative and Quantum Gravity Theories
- Superconducting Materials and Applications
- Radio Astronomy Observations and Technology
- International Science and Diplomacy
- Advanced Semiconductor Detectors and Materials
- High-Energy Particle Collisions Research
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Particle Accelerators and Free-Electron Lasers
National Centre for Nuclear Research
2015-2024
The University of Tokyo
2021-2024
National Institute for Subatomic Physics
2020-2022
Centre National de la Recherche Scientifique
2011-2019
Sorbonne Paris Cité
2019
Institut de Recherche sur les Lois Fondamentales de l'Univers
2019
Délégation Paris 7
2019
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2019
Université Paris Cité
2019
Rutherford Appleton Laboratory
2012-2014
Super-Kamiokande (SK) can search for weakly interacting massive particles (WIMPs) by detecting neutrinos produced from WIMP annihilations occurring inside the Sun. In this analysis, we include neutrino events with interaction vertices in detector addition to upward-going muons surrounding rock. Compared previous result, which used only, signal acceptances light (few−GeV/c2−200−GeV/c2) WIMPs are significantly increased. We fit 3903 days of SK data contribution annihilation found no...
We have searched for proton decay via $p \rightarrow e^{+} \pi^{0}$ and \mu^{+} using Super-Kamiokande data from April 1996 to March 2015, 0.306 megaton$\cdot$years exposure in total. The atmospheric neutrino background rate IV is reduced almost half that of phase I-III by tagging neutrons associated with interactions. reach the lifetime further enhanced introducing new signal criteria select a hydrogen atom. No candidates were seen search. Two passed all selection been observed, but these...
Are there more than three types of neutrinos in nature ? Some experiments show that should exist at least one type, called sterile neutrinos. Using atmospheric neutrino data from the Super-Kamiokande experiment, authors find new limits on oscillations.
We have searched for proton decay via $p \rightarrow \nu K^{+}$ using Super-Kamiokande data from April 1996 to February 2013, 260 kiloton$\cdot$year exposure in total. No evidence this mode is found. A lower limit of the lifetime set $5.9 \times 10^{33}$ years at 90% confidence level.
A comprehensive study on the atmospheric neutrino flux in energy region from sub-GeV up to several TeV using Super-Kamiokande water Cherenkov detector is presented this paper. The and azimuthal spectra of ${\nu}_e+{\bar{\nu}}_e$ ${\nu}_{\mu}+{\bar{\nu}}_{\mu}$ fluxes are measured. obtained an iterative unfolding method by combining various event topologies with differing responses. depending zenith angle, their modulation geomagnetic effects, also studied. predicted east-west asymmetry...
We report an indication that the elastic scattering rate of solar $^8$B neutrinos with electrons in Super-Kamiokande detector is larger when pass through Earth during nighttime. determine day/night asymmetry, defined as difference average day and night divided by those two rates, to be $(-3.2\pm1.1(\text{stat})\pm0.5(\text{syst}))\%$, which deviates from zero 2.7 $\sigma$. Since process mostly sensitive electron-flavored neutrinos, a non-zero asymmetry implies flavor oscillations are...
A search for neutrino oscillations induced by Lorentz violation has been performed using 4,438 live-days of Super-Kamiokande atmospheric data. The is included in addition to standard three-flavor the nonperturbative model extension (SME), allowing use full range path lengths, ranging from 15 12,800 km, and energies 100 MeV more than TeV search. No evidence was observed, so limits are set on renormalizable isotropic SME coefficients eμ, μτ, eτ sectors, improving existing up 7 orders magnitude...
Cosmic-ray-muon spallation-induced radioactive isotopes with $\beta$ decays are one of the major backgrounds for solar, reactor, and supernova relic neutrino experiments. Unlike in scintillator, production yields cosmogenic water have not been exclusively measured before, yet they becoming more important next generation experiments designed to search rare signals. We analyzed low-energy trigger data collected at Super-Kamiokande-IV order determine rates $^{12}$B, $^{12}$N, $^{16}$N,...
Super-Kamiokande (SK) can search for weakly interacting massive particles (WIMPs) by detecting neutrinos produced from WIMP annihilations occurring inside the Sun. In this analysis, we include neutrino events with interaction vertices in detector addition to upward-going muons surrounding rock. Compared previous result, which used only, signal acceptances light (few-GeV/$c^2$ $\sim$ 200-GeV/$c^2$) WIMPs are significantly increased. We fit 3903 days of SK data contribution annihilation found...
To optimise the design of light readout in ArDM 1-ton liquid argon dark matter detector, a range reflector and WLS coating combinations were investigated several small setups, where scintillation was generated by radioactive sources gas at normal temperature pressure shifted into blue region tetraphenyl butadiene (TPB). Various thicknesses TPB deposited spraying vacuum evaporation onto specular 3M{\small\texttrademark}-foil diffuse Tetratex{\small\textregistered} (TTX) substrates. Light...
We have searched for proton into muon plus neutral kaon using data from a 91.7 kiloton-year exposure of Super-Kamiokande-I, 49.2 Super-Kamiokande-II, and 31.9 Super-Kamiokande-III. The number candidate events in the was consistent with atmospheric neutrino background expectation no evidence decay this mode found. set partial lifetime lower limit 1.6x10^33 years at 90% confidence level.
Detecting baryon number violating processes would help to explain the observed asymmetry between matter and antimatter in Universe. The Super-Kamiokande Collaboration reports significantly improved bounds on which changes by two units.
ABSTRACT We report the results from a search in Super-Kamiokande for neutrino signals coincident with first detected gravitational-wave events, GW150914 and GW151226, as well LVT151012, using energy range 3.5 MeV to 100 PeV. searched events within time window of ±500 s around detection time. Four candidates are found GW150914, no GW151226. The remaining consistent expected background events. calculated 90% confidence level upper limits on combined fluence both which depends event topologies....
The Argon Dark Matter (ArDM-1t) experiment is a ton-scale liquid argon (LAr) double-phase time projection chamber designed for direct searches. Such device allows to explore the low energy frontier in LAr with charge imaging detector. ionization extracted from into gas phase and there amplified by use of Large Electron Multiplier order reduce detection threshold. Direct fine spatial granularity, combined measurement amplitude evolution associated primary scintillation light, provide powerful...
Search results for nucleon decays p→e^{+}X, p→μ^{+}X, n→νγ (where X is an invisible, massless particle) as well dinucleon np→e^{+}ν, np→μ^{+}ν, and np→τ^{+}ν in the Super-Kamiokande experiment are presented. Using single-ring data from exposure of 273.4 kton·yr, a search these yields result consistent with no signal. Accordingly, lower limits on partial lifetimes τ_{p→e^{+}X}>7.9×10^{32} yr, τ_{p→μ^{+}X}>4.1×10^{32} τ_{n→νγ}>5.5×10^{32} τ_{np→e^{+}ν}>2.6×10^{32} τ_{np→μ^{+}ν}>2.2×10^{32}...
The trilepton nucleon decay modes p→e+νν and p→μ+νν violate |Δ(B-L)| by two units. Using data from a 273.4 kt yr exposure of Super-Kamiokande search for these decays yields fit consistent with no signal. Accordingly, lower limits on the partial lifetimes τp→e+νν>1.7×10(32) years τp→μ+νν>2.2×10(32) at 90% confidence level are obtained. These can constrain Grand Unified Theories which allow such processes.
ArDM-1t is the prototype for a next generation WIMP detector measuring both scintillation light and ionization charge from nuclear recoils in 1-ton liquid argon target. The goal to reach minimum recoil energy of 30 keVr detect recoiling nuclei. In this paper we describe experimental concept present results on detection system, tested first time ArDM surface at CERN. With preliminary incomplete set PMTs, yield zero electric field found be between 0.3-0.5 phe/keVee depending position within...