A5072849608- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Advanced MRI Techniques and Applications
- Particle physics theoretical and experimental studies
- Black Holes and Theoretical Physics
- Advanced NMR Techniques and Applications
- Noncommutative and Quantum Gravity Theories
- Quantum Electrodynamics and Casimir Effect
- NMR spectroscopy and applications
- Advanced Frequency and Time Standards
- Neutrino Physics Research
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Quantum Mechanics and Applications
- Mechanical and Optical Resonators
- Geophysical and Geoelectrical Methods
Université Grenoble Alpes
2015-2024
Institut National de Physique Nucléaire et de Physique des Particules
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Institut polytechnique de Grenoble
2010-2024
Laboratoire de Physique Subatomique et de Cosmologie
2011-2022
Centre National pour la Recherche Scientifique et Technique (CNRST)
2021
University of Sussex
2020
Institut Laue-Langevin
2006-2019
Université Joseph Fourier
2007-2015
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2011-2013
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...
We present for the first time a detailed and comprehensive analysis of experimental results that set current world sensitivity limit on magnitude electric dipole moment (EDM) neutron. have extended enhanced our earlier to include recent developments in understanding effects gravity depolarizing ultracold neutrons (UCN); an improved calculation spectrum neutrons; conservative estimates other possible systematic errors, which are also shown be consistent with more measurements undertaken...
We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of spin-precession frequencies stored ultracold neutrons and 199Hg atoms an axion-induced oscillating electric dipole moment neutron axion-wind effect. No signal consistent with is observed axion mass range 10−24≤ma≤10−17 eV. Our null result sets first laboratory constraints coupling to gluons, which improve astrophysical limits up 3 orders magnitude, also improves previous nucleons factor 40.Received 29...
The available data on neutron scattering were reviewed to constrain a hypothetical new short-range interaction. We show that these constraints are several orders of magnitude better than those usually cited in the range between 1 pm and 5 nm. This distance occupies an intermediate space collider searches for strongly coupled heavy bosons weak macroscopic forces. emphasize reliability insofar as they provide independent strategies. have identified promising way improve them.
We consider the potential detection of chameleons using bouncing ultracold neutrons. show that presence a chameleon field over planar plate would alter energy levels neutrons in terrestrial gravitational field. When are strongly coupled to nuclear matter, $\ensuremath{\beta}\ensuremath{\gtrsim}{10}^{8}$, we find shift be detectable with forthcoming GRANIT experiment, where sensitivity order 1% peV is expected. also an extremely large coupling $\ensuremath{\beta}\ensuremath{\gtrsim}{10}^{11}$...
We present phase shift measurements for neutron matter waves in vacuum and low pressure Helium using a method originally developed scattering length interferometry. search shifts associated with coupling to scalar fields. set stringent limits chameleon field, prominent quintessence dark energy candidate. find that the constant β is less than 1.9×107 n=1 at 95% confidence level, where n an input parameter of self-interaction field φ inversely proportional φn.
We have studied the relaxation of a spin-polarized gas in magnetic field, presence short-range spin-dependent interactions. As main result we established link between specific properties interaction and dependence spin-relaxation rate on magnitude holding field. This allows us to formulate new, extremely sensitive method study (pseudo) at submillimeter scale, which are difficult access by other means. The has been used as probe for nucleon-nucleon axionlike $P$, $T$ violating interactions...
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 report on a neutron particle physics experiment, which provides for the first time an upper limit strength of axial coupling constant new light spin 1 boson in millimeter range. Such would mediate force between ordinary fermions, like neutrons and protons. The experiment was set up at cold reflectometer Narziss Paul Scherrer Institute uses Ramsey's technique separated oscillating fields to search pseudomagnetic precession induced by this interaction. For $g_A^2$, $6\times10^{-13}$ (95%...
We consider different methods to probe the chameleon scalar field with slow neutrons. Chameleons modify potential of bouncing neutrons over a flat mirror in terrestrial gravitational field. This induces shift energy levels which could be detected current experiments like GRANIT. between parallel plates have profile is bubblelike and would phase interferometric experiments. show that this new method detection competitive neutron one, hopefully providing an efficient chameleons when strongly...
Dark sectors lying beyond the Standard Model and containing sub-GeV particles which are bilinearly coupled to nucleons would induce quantum forces of Casimir-Polder type in ordinary matter. Such new can be tested by a variety experiments over many orders magnitude. We provide generic interpretation these experimental searches apply it sample from dark scalars behaving as $1/{r}^{3}$, $1/{r}^{5}$, $1/{r}^{7}$ at short range. The landscape constraints on such differs one modified gravity with...
It has been proposed that there could be a mirror copy of the standard model particles, restoring parity symmetry in weak interaction on global level. Oscillations between neutral particle, such as neutron, and its counterpart potentially answer various standing issues physics today. Astrophysical studies terrestrial experiments led by ultracold neutron storage measurements have investigated to mirror-neutron oscillations imposed constraints theoretical parameters. Recently, further analysis...
We present the design of a next-generation experiment, n2EDM, currently under construction at ultracold neutron source Paul Scherrer Institute (PSI) with aim carrying out high-precision search for an electric dipole moment neutron. The project builds on experience gained previous apparatus operated PSI until 2017, and is expected to deliver order magnitude better sensitivity provision further substantial improvements. An overview experimental method setup given, requirements are derived, its...
Abstract High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present recent achievements degaussing equilibrating magnetically shielded room (MSR) n2EDM experiment at Paul Scherrer Institute. final configuration that will be used after numerous studies. The optimized procedure results in a residual has been reduced by factor two. ultra-low is achieved with full magnetic-field-coil system, large vacuum vessel...
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 report a new limit on possible short range spin-dependent interaction from the precise measurement of ratio Larmor precession frequencies stored ultracold neutrons and $^{199}$Hg atoms confined in same volume. The was performed $\sim$1$\mu$ T vertical magnetic holding field with apparatus searching for permanent electric dipole moment neutron at Paul Scherrer Institute. A coupling between freely precessing polarized spins unpolarized nucleons wall material can be investigated by tiny...
Magnetic-field uniformity is of the utmost importance in experiments to measure electric dipole moment neutron. A general parametrization magnetic field terms harmonic polynomial modes proposed, going beyond linear-gradients approximation. We review main undesirable effects nonuniformities: depolarization ultracold neutrons and Larmor frequency shifts mercury atoms. The theoretical predictions for these were verified by dedicated measurements with single-chamber neutron...
We present the magnetically shielded room (MSR) for n2EDM experiment at Paul Scherrer Institute which features an interior cubic volume with each side of length 2.92m, thus providing accessible space 25m3. The MSR has 87 openings up to 220mm diameter operate experimental apparatus inside, and intermediate between layers sensitive signal processing electronics. characterization measurements show a remanent magnetic field in central 1m3 below 100pT, 600pT entire inner volume, 4\,cm walls....
Diamond, with its exceptionally high optical nuclear potential and low absorption cross-section, is a unique material for series of applications in VCN (very cold neutron) physics techniques. In particular, powder diamond nanoparticles provides the best reflector neutrons complete energy range. It allowed also first observation quasi-specular reflection (CN) from disordered medium. Effective critical velocity such higher than that super-mirror. Nano-diamonds survive radiation fluxes;...
The Surrounding Field Compensation (SFC) system described in this work is installed around the four-layer Mu-metal magnetic shield of neutron electric dipole moment spectrometer located at Paul Scherrer Institute. SFC reduces DC component external field by a factor about 20. Within control volume approximately 2.5 m × 3 m, disturbances are attenuated factors 5–50 bandwidth from 10−3 Hz up to 0.5 Hz, which corresponds integration times longer than several hundreds seconds and represent...