A5107250893- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- High-Energy Particle Collisions Research
- Nuclear reactor physics and engineering
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Astronomical and nuclear sciences
- X-ray Spectroscopy and Fluorescence Analysis
- Particle physics theoretical and experimental studies
- Advanced MRI Techniques and Applications
- Advanced NMR Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Statistical Mechanics and Entropy
- Cosmology and Gravitation Theories
- Noncommutative and Quantum Gravity Theories
- Nuclear Materials and Properties
- Ion-surface interactions and analysis
- Radioactive Decay and Measurement Techniques
- Geomagnetism and Paleomagnetism Studies
- Radiation Therapy and Dosimetry
- Gamma-ray bursts and supernovae
Centre National de la Recherche Scientifique
2015-2025
École Nationale Supérieure d'Ingénieurs de Caen
2015-2025
Université de Caen Normandie
2014-2025
Normandie Université
2016-2024
Laboratoire de Physique Corpusculaire de Caen
2006-2023
University of Sussex
2020
Institut National de Physique Nucléaire et de Physique des Particules
1999-2019
Laboratoire de Physique Corpusculaire
2001-2018
Indiana University Bloomington
1999-2009
Paul Scherrer Institute
2009
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...
Using symmetric $^{112}\mathrm{S}\mathrm{n}+^{112}\mathrm{S}\mathrm{n}$, $^{124}\mathrm{S}\mathrm{n}+^{124}\mathrm{S}\mathrm{n}$ collisions as references, we probe isospin diffusion in peripheral asymmetric $^{112}\mathrm{S}\mathrm{n}+^{124}\mathrm{S}\mathrm{n}$, $^{124}\mathrm{S}\mathrm{n}+^{112}\mathrm{S}\mathrm{n}$ systems at an incident energy of $E/A=50\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$. Isoscaling analyses imply that the quasiprojectile and quasitarget these do not achieve...
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...
Isotopic distributions for light particles and intermediate mass fragments have been measured 112Sn+112Sn, 112Sn+124Sn, 124Sn+112Sn, 124Sn+124Sn collisions at E/A = 50 MeV. Isotope, isotone, isobar yield ratios are utilized to estimate the isotopic composition of gas phase freeze-out. Analyses within equilibrium limit imply that is enriched in neutrons relative liquid represented by bound nuclei. These observations suggest neutron diffusion commensurate with or more rapid than fragment production.
The thermal component of the 8 GeV/c pi+ Au data ISiS Collaboration is shown to follow scaling predicted by Fisher's model when Coulomb energy taken into account. Critical exponents tau and sigma, critical point (p(c),rho(c),T(c)), surface coefficient c(0), enthalpy evaporation DeltaH, compressibility factor C(F)(c) are determined. For first time, experimental phase diagrams, (p,T) (T,rho), describing liquid vapor coexistence finite neutral nuclear matter have been constructed.
Experimental data obtained with the 4π multidetector system INDRA are used to study light charged particle (LCP, Z<~2) and intermediate mass fragment (IMF, Z>~3) production in peripheral semicentral collisions of Xe Sn at 50 MeV/nucleon. It is found that a sizable fraction detected LCP’s IMF’s originates from midvelocity region. These fragments can be seen come either prompt (preequilibrium) mechanism or slower but dynamically influenced emission process. The relative magnitude isotropic...
In case a mirror world with copy of our ordinary particle spectrum would exist, the neutron n and its degenerate partner, n', could potentially mix undergo nn' oscillations. The interaction an magnetic field lift degeneracy between partners, diminish n' amplitude in wave function and, thus, suppress observability. We report experimental comparison ultracold storage trap without superimposed field. No influence is found assuming negligible fields, limit on oscillation time taunn' > 103 s (95%...
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...
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...
We present a coil system designed to generate highly uniform magnetic field for the n2EDM experiment at Paul Scherrer Institute. It consists of main B0 and set auxiliary coils mounted on cubic structure with side length 273cm , inside large magnetically shielded room (MSR). have assembled this characterized its performances mapping robot. The apparatus is able 1μT vertical relative root mean square deviation σ(Bz)/Bz=3×10-5 over volume interest, cylinder radius 40cm height 30cm . This level...
Excitation-energy-gated two-fragment correlation functions have been studied between 2 to 9A MeV of excitation energy for equilibrium-like sources formed in $\pi^-$ and p + $^{197}$Au reactions at beam momenta 8,9.2 10.2 GeV/c. Comparison the data an N-body Coulomb-trajectory code shows a decrease one order magnitude fragment emission time interval 2-5A MeV, followed by nearly constant breakup higher energy. The observed is shown be strongly correlated with increase probability, onset...
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...
We present a magnetometer based on optically pumped Cs atoms that measures the magnitude and direction of 1 μT magnetic field. Multiple circularly polarized laser beams were used to probe free spin precession atoms. The design was optimized for long-time stability achieves scalar resolution better than 300 fT integration times ranging from 80 ms 1000 s. best less reached with 1.6 6 able measure field 10 μrad s up 2000
For 50 MeV/nucleon 129Xe+natSn multifragmentation events, we deduced, by means of correlation techniques, the multiplicities hydrogen and helium isotopes which were emitted hot primary excited fragments produced at stage disassembly an equilibrated source. We also derived relative kinetic energy distributions between clusters light charged particles that they evaporate. From comparison secondary observed experimentally predicted GEMINI model, concluded source breaks into are characterized...
Isotopic yields for light particles and intermediate mass fragments have been measured central $^{112}\mathrm{Sn}+^{112}\mathrm{Sn}$, $^{112}\mathrm{Sn}+^{124}\mathrm{Sn}$, $^{124}\mathrm{Sn}+^{112}\mathrm{Sn}$, $^{124}\mathrm{Sn}+^{124}\mathrm{Sn}$ collisions at $E∕A=50\phantom{\rule{0.3em}{0ex}}\text{MeV}$ compared with predictions of stochastic mean field calculations. These calculations predict a sensitivity the isotopic distributions to density dependence asymmetry term nuclear equation...
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....
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...