A5014107888- Muon and positron interactions and applications
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Atomic and Molecular Physics
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Cold Atom Physics and Bose-Einstein Condensates
- X-ray Spectroscopy and Fluorescence Analysis
- Neutrino Physics Research
- Advanced Frequency and Time Standards
- CCD and CMOS Imaging Sensors
- Superconducting Materials and Applications
- Radioactive Decay and Measurement Techniques
- Medical Imaging Techniques and Applications
- Magnetic confinement fusion research
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Laser-induced spectroscopy and plasma
- Electron and X-Ray Spectroscopy Techniques
- Cultural Heritage Materials Analysis
- Advanced NMR Techniques and Applications
Johannes Gutenberg University Mainz
2016-2024
University of Washington
2013-2022
University of Geneva
2021
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...
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}...
The electric dipole moments~(EDM) of fundamental particles inherently violate parity~(P) and time-reversal~(T) symmetries. By virtue the CPT theorem in quantum field theory, latter also implies violation combined charge-conjugation parity~(CP) symmetry. We aim to measure EDM muon using frozen-spin technique within a compact storage trap. This method exploits high effective field, \$E \approx 165\$ MV/m, experienced rest frame with momentum about 23 MeV/c when it passes through solenoidal...
This letter of intent proposes an experiment to search for electric dipole moment the muon based on frozen-spin technique. We intend exploit high field, $E=1{\rm GV/m}$, experienced in rest frame with a momentum $p=125 {\rm MeV/}c$ when passing through large magnetic field $|\vec{B}|=3{\rm T}$. Current fluxes at $μ$E1 beam line permit improved sensitivity $σ(d_μ)\leq 6\times10^{-23}e{\rm cm}$, about three orders magnitude more than current upper limit $|d_μ|\leq1.8\times10^{-19}e{\rm...
The hyperfine splitting of the 5g→4f transitions in muonic 185,187Re has been measured using high resolution purity germanium detectors and compared to state-of-the-art atomic theoretical predictions. spectroscopic quadrupole moment extracted modern fitting procedures values available literature obtained from x rays natural rhenium. nuclear are 2.07(5) b 1.94(5) b, respectively for 185Re 187Re.1 MoreReceived 27 November 2019Accepted 21 February...
A knob bow fibula (Bügelknopffibel) of the Leutkirch type, which typologically belongs to second half 4th and early 5th century CE, was excavated in 2018 Roman city Augusta Raurica, present-day Kaiseraugst (AG, Switzerland). This analyzed for first time its elemental composition by using non-destructive technique Muon Induced X-ray Emission (MIXE) continuous muon beam facility at Paul Scherrer Institute (PSI). In present work, detection limit is 0.4 wt% with ∼ 1.5 hours measurement time. The...
In April 2021, scientists active in muon physics met to discuss and work out the case for new High-Intensity Muon Beams (HIMB) project at PSI that could deliver of order $10^{10}$\,s$^{-1}$ surface muons experiments. Ideas concrete proposals were further substantiated over following months assembled present document. The high intensities will allow completely experiments with considerable discovery potential unique sensitivities. is outstanding extremely rich, ranging from fundamental...
The toolbox for material characterization has never been richer than today. Great progress with all kinds of particles and interaction methods provide access to nearly properties an object under study. However, a tomographic analysis the subsurface region remains still challenge In this regard, Muon Induced X-ray Emission (MIXE) technique seen rebirth fueled by availability high intensity muon beams. We report here study conducted at Paul Scherrer Institute (PSI). It demonstrates that...
Abstract The QUARTET collaboration aims to significantly improve the precision of absolute nuclear charge radii light nuclei from Li Ne by using an array metallic magnetic calorimeters perform high-precision X-ray spectroscopy low-lying states in muonic atoms. A proof-of-principle measurement with lithium, beryllium and boron is planned for fall 2023 at Paul Scherrer Institute. We discuss performance achieved maXs-30 detector module be used. To place close target chamber where muon beam will...
The MuPix7 chip is a monolithic HV-CMOS pixel chip, thinned down to 50 \mu m. It provides continuous self-triggered, non-shuttered readout at rates up 30 Mhits/chip of 3x3 mm^2 active area and size 103x80 m^2. hit efficiency depends on the chosen working point. Settings with power consumption 300 mW/cm^2 allow for >99.5%. A time resolution 14.2 ns (Gaussian sigma) achieved. Latest results from 2016 test beam campaigns are shown.
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. In proposed experiment, p atom excited pulse from singlet to triplet sub-levels, and quenched back state an inelastic collision H _2 display="inline"><mml:msub><mml:mi /><mml:mn>2</mml:mn></mml:msub></mml:math>...
The project is conducting a series of muonic X-ray measurements in medium- and high-Z nuclei at PSI, utilizing high-purity germanium detector array, in-beam muon detectors, modern digital data-acquisition system. A novel hydrogen target for transfer was developed, enabling with as little few micrograms material. First radioactive Cm Ra targets were conducted, aimed determining their nuclear charge radii. These serve important input upcoming atomic parity violation experiments. apparatus also...
We report the first precise measurement of a $\ensuremath{\beta}$-recoil correlation from radioactive noble gas ($^{6}\mathrm{He}$) confined via magneto-optical trap. The is motivated by search for exotic tensor-type contributions to charged weak current. Interpreted as tensor currents with right-handed neutrinos, measurements yield $|{C}_{T}/{C}_{A}{|}^{2}\ensuremath{\le}0.022$ (90% confidence limit, C.L.). On other hand, left-handed neutrinos limits are $0.007<{C}_{T}/{C}_{A}<0.111$...
The MuPix Telescope is a particle tracking telescope, optimized for low momentum particles at high rates. It based on the novel High-Voltage Monolithic Active Pixel Sensors (HV-MAPS), designed Mu3e detector. telescope represents first application of HV-MAPS technology and also serves as test bed readout chain. consists up to eight layers newest prototypes, MuPix7 sensors, which send self-triggered data via fast serial links FPGAs, where time-ordered sent PC. A hit rate 1 MHz per layer could...
The Mu3e experiment aims to find or exclude the lepton flavour violating decay $\mu^+\to e^+e^-e^+$ with a sensitivity of one in 10$^{16}$ muon decays. first phase is currently under construction at Paul Scherrer Institute (PSI, Switzerland), where beams up 10$^8$ muons per second are available. detector will consist an ultra-thin pixel tracker made from High-Voltage Monolithic Active Pixel Sensors (HV-MAPS), complemented by scintillating tiles and fibres for precise timing measurements....
The accurate determination of atomic final states following nuclear $\ensuremath{\beta}$ decay plays an important role in several experiments. In particular, the charge state distributions ions are for determinations $\ensuremath{\beta}\text{\ensuremath{-}}\ensuremath{\nu}$ angular correlation with improved precision. Beyond hydrogenic cases, neutral $^{6}\mathrm{He}$ presents simplest case. Our measurement aims at providing benchmarks to test theoretical calculations. kinematics...
The 6He nucleus is an ideal candidate to study the weak interaction. To this end we have built a high-intensity source of delivering ~10^10 atoms/s experiments. Taking full advantage that available intensity performed high-precision measurement half-life directly probes axial part nuclear Hamiltonian. Currently, are preparing beta-neutrino angular correlation in beta decay will allow search for new physics beyond Standard Model form tensor currents.
The Mu3e experiment is searching for the charged lepton flavour violating decay\break μ+→ e+ e− e+, aiming an ultimate sensitivity of one in 1016 decays. In environment up to 109 muon decays per second detector needs provide precise vertex, time and momentum information suppress accidental physics background. consists cylindrical layers 50 μm thin High Voltage Monolithic Active Pixel Sensors (HV-MAPS) placed a 1 T magnetic field. measurement trajectories decay particles allows vertex...
Correlations between β decay products are sensitive observables to look for exotic contributions the weak interaction excluded by Standard Model of particle physics. To precisely measure – v angular correlation parameter, αβν, in 6He decay, radioactive atoms trapped a magneto-optical trap and momentum particles 6Li recoil ions measured coincidence. The shake-off process, leading higher charge states Li, plays an important role this observation must be studied carefully. Its study provides...
The central detector in the MuSun experiment is a pad-plane time projection ionization chamber that operates without gas amplification deuterium at 31 K; it used to measure rate of muon capture process μ−+d→n+n+νμ. A new charge-sensitive preamplifier, operated 140 K, has been developed for this detector. It achieved resolution 4.5 keV(D2) or 120 e− RMS with zero capacitance 1.1 μ s integration laboratory tests. In experimental environment, electronic 10 250 0.5 time. excellent energy...
Muonic atoms have been used to extract the most accurate nuclear charge radii based on detection of X-rays from muonic cascades. Most stable and a few unstable isotopes investigated with atom spectroscopy techniques. A new research project recently started at Paul Scherrer Institut aims extend highresolution for precise determination other structure properties radioactive isotopes. The challenge combine high-energy muon beam small quantity stopping mass is being addressed by developing...