A5032008368- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Gamma-ray bursts and supernovae
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Advanced MRI Techniques and Applications
- Noncommutative and Quantum Gravity Theories
- Quantum Chromodynamics and Particle Interactions
- Muon and positron interactions and applications
- Advanced NMR Techniques and Applications
- Nuclear physics research studies
- Genomics and Phylogenetic Studies
- Atomic and Molecular Physics
- Quantum optics and atomic interactions
- Radio Astronomy Observations and Technology
- African Botany and Ecology Studies
- Advanced Frequency and Time Standards
- Radioactive Decay and Measurement Techniques
- Ginkgo biloba and Cashew Applications
Laboratoire de Physique Nucléaire et de Hautes Énergies
2015-2024
Centre National de la Recherche Scientifique
2009-2023
Institut National de Physique Nucléaire et de Physique des Particules
2009-2023
Sorbonne Université
2015-2023
TRIUMF
2017-2023
Nagoya University
2023
Institute for High Energy Physics
2023
École Nationale Supérieure d'Ingénieurs de Caen
2009-2020
Normandie Université
2016-2020
Paul Scherrer Institute
2009-2020
We present the result of an experiment to measure electric dipole moment (EDM) neutron at Paul Scherrer Institute using Ramsey's method separated oscillating magnetic fields with ultracold neutrons (UCN). Our measurement stands in long history EDM experiments probing physics violating time reversal invariance. The salient features this were use a Hg-199 co-magnetometer and array optically pumped cesium vapor magnetometers cancel correct for field changes. statistical analysis was performed...
A clock comparison experiment, analyzing the ratio of spin precession frequencies stored ultracold neutrons and 199Hg atoms, is reported. No daily variation this could be found, from which set an upper limit on Lorentz invariance violating cosmic anisotropy field b perpendicular < 2 x 10(-20) eV (95% C.L.). This first for free neutron. result also interpreted as a direct gravitational dipole moment neutron |gn| 0.3 eV/c2 m spin-dependent interaction with Sun. Analyzing Earth, based previous...
We performed ultracold neutron storage measurements to search for additional losses due (n) mirror-neutron (n′) oscillations as a function of an applied magnetic field B. In the presence mirror B′, would be maximal B≈B′. did not observe any indication nn′ and placed lower limit on oscillation time τnn′>12.0 s at 95% C.L. B′ between 0 12.5 μT.Received 26 May 2009DOI:https://doi.org/10.1103/PhysRevD.80.032003©2009 American Physical Society
The measurement of the neutron electric dipole moment (nEDM) constrains contribution CP-violating terms within both Standard Model and its extensions. experiment uses ultracold neutrons (UCN) stored in vacuum at room temperature. This technique provided last (and best) limit by RAL/Sussex/ILL collaboration 2006: dn < 2:9 × 10-26 e cm (90% C.L.). We aim to improve experimental sensitivity a factor 5 2-3 years, using an upgrade same apparatus. will take advantage increased density Paul...
The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty 0.8 ppm. We employed apparatus where ultracold neutrons and mercury atoms are stored in same volume report result γn/γHg=3.8424574(30).
We installed a source for ultracold neutrons at new, dedicated spallation target TRIUMF. The was originally developed in Japan and uses superfluid-helium converter cooled to 0.9$\,$K. During an extensive test campaign November 2017, we extracted up 325000 after one-minute irradiation of the target, over three times more than previously achieved with this source. corresponding ultracold-neutron density whole production guide volume is 5.3$\,$cm$^{-3}$. storage lifetime initially 37$\,$s...
We propose an original test of Lorentz invariance in the interaction between a particle spin and electromagnetic field report on first measurement using ultracold neutrons. used high-sensitivity neutron electric dipole moment (nEDM) spectrometer searched for direction dependence nEDM signal leading to modulation its magnitude at periods 12 24 hours. constrain such d12 < 10×10−25e cm d24 14×10−25e 95% C.L. The result translates into limit energy scale this type violation effect level εLV > 1010 GeV.
At Institut Laue-Langevin (ILL) and Paul Scherrer Institute (PSI), we have measured the losses depolarization probabilities of ultracold neutrons on various materials: (i) nickel-molybdenum alloys with weight percentages 82/18, 85/15, 88/12, 91/9, 94/6 natural nickel Ni100, (ii) nickel-vanadium NiV93/7, (iii) copper, (iv) deuterated polystyrene (dPS). For different samples, storage-time constants up to $\ensuremath{\sim}460\phantom{\rule{0.16em}{0ex}}\mathrm{s}$ were obtained at room...
Genetically modified genomes are often used today in many areas of fundamental and applied research. In studies, coding or noncoding regions order to change protein sequences gene expression levels. Modifying one several nucleotides a genome can also lead unexpected changes the epigenetic regulation genes. When designing synthetic with mutations, it would thus be very informative able predict effect these mutations on chromatin. We develop here deep learning approach that quantifies every...
An array of sixteen laser-pumped scalar Cs magnetometers was part the neutron electric dipole moment (nEDM) experiment taking data at Paul Scherrer Institute in 2015 and 2016. It deployed to measure gradients experiment's magnetic field monitor their temporal evolution. The originality lies its compact design, which a single near-infrared diode laser drives all that are located high-vacuum chamber, with selection sensors mounted on high-voltage electrode. We describe details sensors'...
A fast-switching, high-repetition-rate magnet and power supply have been developed for operated at TRIUMF, to deliver a proton beam the new ultracold neutron (UCN) facility. The facility possesses unique operational requirements: time-averaged current of 40~$\mu$A with ability switch on or off several minutes. These requirements are in conflict typical operation mode TRIUMF cyclotron which delivers nearly continuous multiple users. To enable creation UCN facility, beam-sharing arrangement...
NectarCAM is a camera proposed for the medium-sized telescopes of Cherenkov Telescope Array (CTA) covering central energy range ~100 GeV to ~30 TeV. It has modular design and based on NECTAr chip, at heart which GHz sampling Switched Capacitor 12-bit Analog Digital converter. The will be equipped with 265 7-photomultiplier modules, field view 8 degrees. Each module includes photomultiplier bases, high voltage supply, pre-amplifier, trigger, readout Ethernet transceiver. recorded events last...
Precise measurements in the β decay of 35Ar nucleus enable to search for deviations from Standard Model (SM) weak sector. These either check CKM matrix unitarity or constrain existence exotic currents rejected V-A theory SM. For this purpose, β-ν angular correlation parameter, aβν, is inferred a comparison between experimental and simulated recoil ion time-of-flight distributions following quasi-pure Fermi transition 35Ar1+ ions confined transparent Paul trap LPCTrap device at GANIL. During...