A5037204344- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Neutrino Physics Research
- Solid State Laser Technologies
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Fiber Laser Technologies
- Nuclear physics research studies
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Experimental and Theoretical Physics Studies
- Astrophysics and Cosmic Phenomena
- Laser-Matter Interactions and Applications
- Advanced MRI Techniques and Applications
- Laser Design and Applications
Paul Scherrer Institute
2016-2025
ETH Zurich
2016-2025
Institute of Particle Physics
2015-2024
École Polytechnique Fédérale de Lausanne
2010-2023
Institute of Physics
2007-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2022-2023
Jagiellonian University
2010-2023
Shanghai Jiao Tong University
2022
European Organization for Nuclear Research
2022
University of Pisa
2022
Solar neutrinos from the decay of $^8$B have been detected at Sudbury Neutrino Observatory (SNO) via charged current (CC) reaction on deuterium and by elastic scattering (ES) electrons. The CC is sensitive exclusively to nu_e's, while ES also has a small sensitivity nu_mu's nu_tau's. flux nu_e's ^8B measured rate \phi^CC(nu_e) = 1.75 +/- 0.07 (stat)+0.12/-0.11 (sys.) 0.05(theor) x 10^6 /cm^2 s. Assuming no flavor transformation, inferred \phi^ES(nu_x) 2.39+/-0.34 (stat.)+0.16}/-0.14 (sys)...
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...
This chapter of the report "Flavor in era LHC" Workshop discusses theoretical, phenomenological and experimental issues related to flavor phenomena charged lepton sector conserving CP-violating processes. We review current limits main theoretical models for structure fundamental particles. analyze consequences available data, setting constraints on explicit beyond standard model, presenting benchmarks discovery potential forthcoming measurements both at LHC low energy, exploring options...
Abstract The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of CERN’s accelerator complex and infrastructures through projects complementary to LHC other possible future colliders. These will target fundamental physics questions in modern particle physics. This document presents status proposals presented framework Standard Model working group, explore their reach impact that CERN could have next 10–20 years on international landscape.
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...
Abstract The energy levels of hydrogen-like atomic systems can be calculated with great precision. Starting from their quantum mechanical solution, they have been refined over the years to include electron spin, relativistic and field effects, tiny shifts related complex structure nucleus. These caused by nuclear are vastly magnified in formed a negative muon nucleus, so spectroscopy these muonic ions used investigate high Here we present measurement two 2S–2P transitions helium-4 ion that...
We propose an experiment to measure the nuclear charge radii of light elements with up 20~times higher accuracy. These are essential both for understanding physics at low energies, and experimental theoretical applications in simple atomic systems. Such comparisons advance bound-state quantum electrodynamics useful searching new beyond Standard Model. The energy levels muonic atoms highly susceptible structure, especially mean square radius. lightest nuclei (with number, $Z=1,2$) have been...
Ultra-cold neutrons (UCN), with energies low enough to be confined by the Fermi potential in material bottles, are playing an increasing role measurements of fundamental properties neutron. The ability manipulate UCN guides and magnetic fields, gravity can lead experiments lower systematic errors than have been obtained cold neutron beams. densities provided existing reactor sources limit these experiments. promise much higher from solid deuterium has led proposed facilities coupled both...
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...
We plan to measure several 2S–2P transition frequencies in μ 4 He + and 3 by means of laser spectroscopy with an accuracy 50 ppm. This will lead a determination the corresponding nuclear rms charge radii relative × 10 −4 , limited uncertainty polarization contribution. First, these measurements help solve proton radius puzzle. Second, very precise are benchmarks for ab initio few-nucleon theories potentials. Finally when combined ongoing measurement 1S–2S enhanced bound-state QED test 1S Lamb shift .
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...
The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen ( \mu <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi></mml:math> p) with 1 ppm accuracy by means pulsed laser spectroscopy to determine two-photon-exchange contribution 2\times10^{-4}...
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...
Muonic atom spectroscopy is a method that can determine absolute nuclear charge radii with typical relative precision of $$10^{-3}$$ . Recent developments have enabled to extend muonic microscopic target quantities as low $$5\,{\upmu }\text {g}$$ This substantial reduction from the traditional limit order $$100\,\text {mg}$$ based on transfer mechanism in high-pressure hydrogen gas cell, which transports muon surface material rather than stopping it over broad depth range. approach enables...
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 report on muonium (Mu) emission into vacuum following μ(+) implantation in mesoporous thin SiO(2) films. obtain a yield of Mu (38±4)% at 250 K and (20±4)% 100 for 5 keV energy. From the energy dependence we determine diffusion constants these films: D(Mu)(250 K)=(1.6±0.1)×10(-4) cm(2)/s D(Mu)(100 K)=(4.2±0.5)×10(-5) cm(2)/s. Describing process as quantum mechanical tunneling from pore to pore, reproduce measured temperature ∼T(3/2) constant. extract potential barrier (-0.3±0.1) eV which...