A5050692778- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Advanced MRI Techniques and Applications
- Astro and Planetary Science
- Planetary Science and Exploration
- Advanced Frequency and Time Standards
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Photocathodes and Microchannel Plates
- Magnetic Field Sensors Techniques
- Quantum optics and atomic interactions
- Advanced NMR Techniques and Applications
- Inertial Sensor and Navigation
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Cosmology and Gravitation Theories
Paul Scherrer Institute
2015-2024
Johannes Gutenberg University Mainz
2017-2023
Institut Laue-Langevin
2022
University of Bern
2017-2022
Institute of Nuclear Physics, Polish Academy of Sciences
2017-2022
KU Leuven
2017-2022
Jagiellonian University
2017-2022
Institute of Physics
2017-2022
North Carolina State University
2022
University of Sussex
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...
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 violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation matter over antimatter needed to account observed baryon asymmetry in universe. However, such a process has yet be experimentally observed. HIBEAM/NNBAR %experiment program proposed two-stage experiment at European Spallation Source (ESS) search number violation. will include high-sensitivity searches processes that violate by one or two units: free neutron-antineutron oscillation...
Ultracold neutrons (UCNs) are key for precision studies of fundamental parameters the neutron and in searches new charge-parity-violating processes or exotic interactions beyond Standard Model particle physics. The most prominent example is search a permanent electric-dipole moment (nEDM). We have performed an experimental comparison leading UCN sources currently operating. used ``standard'' storage bottle with volume 32 liters, comparable size to nEDM experiments, which allows us compare...
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 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
While the international nEDM collaboration at Paul Scherrer Institut (PSI) took data in 2017 that covered a considerable fraction of parameter space claimed potential signals hypothetical neutron (n) to mirror-neutron (n′) transitions, it could not test all signal regions various mirror magnetic fields. Therefore, new study n−n′ oscillations using stored ultracold neutrons (UCNs) is underway PSI, considerably expanding reach fields (B′) and oscillation time constants (τnn′). The apparatus...
We report on a search for dark matter axionlike particles (ALPs) using Ramsey-type apparatus cold neutrons. A hypothetical ALP-gluon coupling would manifest in neutron electric dipole moment signal oscillating time. Twenty-four hours of data have been analyzed frequency range from 23 μHz to 1 kHz, and no significant has found. The usage present dark-matter models allows one constrain the ALPs gluons mass 10^{-19} 4×10^{-12} eV. best limit C_{G}/f_{a}m_{a}=2.7×10^{13} GeV^{-2} (95% C.L.) is...
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....
We describe a spin-echo method for ultracold neutrons (UCNs) confined in precession chamber and exposed to $|B_0|=1~\text{\mu T}$ magnetic field. have demonstrated that the analysis of UCN resonance signals combination with knowledge ambient field provides an excellent by which reconstruct energy spectrum ensemble neutrons. The takes advantage relative dephasing spins arising from gravitationally induced striation stored different energies, also permits improved determination vertical...
We compare the expected effects of so-called gravitationally enhanced depolarization ultracold neutrons to measurements carried out in a spin-precession chamber exposed variety vertical magnetic-field gradients. In particular, we have investigated dependence upon these field gradients spin-depolarization rates and also shifts measured neutron Larmor precession frequency. find excellent qualitative agreement, with accounting for several previously unexplained features data.Received 22 June...
We present the new spectrometer for neutron electric dipole moment (nEDM) search at Paul Scherrer Institute (PSI), called n2EDM. The setup is room temperature in vacuum using ultracold neutrons. n2EDM features a large UCN double storage chamber design with transport adapted to PSI source. builds on experience gained from previous apparatus operated until 2017. An order of magnitude increase sensitivity calculated baseline based scalable results apparatus, and source performance achieved 2016.