A5066564566- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Noncommutative and Quantum Gravity Theories
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Radioactive Decay and Measurement Techniques
- Quantum Information and Cryptography
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Electromagnetic Scattering and Analysis
- Computational Drug Discovery Methods
- Quantum Mechanics and Applications
- Advanced NMR Techniques and Applications
- Radiation Therapy and Dosimetry
- Machine Learning in Materials Science
- Crystallography and Radiation Phenomena
Stanford University
2025
University College London
2025
RIKEN
2021-2024
The University of Tokyo
2018-2024
Tokyo University of the Arts
2020-2024
Stefan Meyer Institute for Subatomic Physics
2016-2024
Austrian Academy of Sciences
2016-2024
University of Bonn
1967
We constrain the coupling between axionlike particles (ALPs) and photons, measured with superconducting resonant detection circuit of a cryogenic Penning trap. By searching noise spectrum our fixed-frequency for peaks caused by dark matter ALPs converting into photons in strong magnetic field Penning-trap magnet, we are able to masses around $2.7906-2.7914\,\textrm{neV/c}^2$ $g_{a\gamma}< 1 \times 10^{-11}\,\textrm{GeV}^{-1}$. This is more than one order magnitude lower best laboratory...
Abstract Efficient cooling of trapped charged particles is essential to many fundamental physics experiments 1,2 , high-precision metrology 3,4 and quantum technology 5,6 . Until now, sympathetic has required close-range Coulomb interactions 7,8 but there been a sustained desire bring laser-cooling techniques in macroscopically separated traps 5,9,10 extending control previously inaccessible such as highly ions, molecular ions antimatter. Here we demonstrate single proton using laser-cooled...
Glioblastoma multiforme (GBM) progression is associated with changes in matrix stiffness, and different regions of the tumor niche exhibit distinct stiffnesses. Using elastic hydrogels, previous work has demonstrated that stiffness modulates GBM behavior drug responses. However, brain tissue viscoelastic, how impacts invasive phenotype response to therapy within a viscoelastic remains largely unclear. Here, we report three-dimensional (3D) hydrogel system models heterogeneity present niche....
<title>Abstract</title> Coherent quantum transition spectroscopy is a powerful tool in quantum-sensing and metrology (1), information processing (2), accurate magnetometry (3), high-precision tests of the fundamental laws nature, searches for physics beyond Standard Model (4). In atomic measurements, it was applied with great success proton deuteron magnetic moment measurements (5), which culminated example MASER sub-parts per trillion resolution (6), record-constraints on neutron electric...
Abstract Next generation tritium decay experiments to determine the absolute neutrino mass require high-precision measurements of β-decay electron energies close kinematic end point. To achieve this, development high phase-space density sources atomic is required, along with implementation methods control motion these atoms allow extended observation times. A promising approach efficiently and accurately measure kinetic individual electrons generated in dilute gases, frequency cyclotron...
The goal of the ASACUSA-CUSP collaboration at Antiproton Decelerator CERN is to measure ground-state hyperfine splitting antihydrogen using an atomic spectroscopy beamline. A milestone was achieved in 2012 through detection 80 atoms 2.7 m away from their production region. This first observation ‘cold’ a magnetic field free In parallel progress on production, beamline tested with source hydrogen. led measurement relative precision 2.7×10 −9 which constitutes most precise hydrogen beam....
Cooling of particles to mK-temperatures is essential for a variety experiments with trapped charged particles. However, many species interest lack suitable electronic transitions direct laser cooling. We study theoretically the remote sympathetic cooling single proton laser-cooled $^9$Be$^+$ in double-Penning-trap system. investigate three different schemes and find, based on analytical calculations numerical simulations, that two them are capable achieving temperatures about 10 mK times...
The ASACUSA collaboration at the Antiproton Decelerator of CERN aims a precise measurement antihydrogen ground-state hyperfine structure as test fundamental CPT symmetry. A beam atoms is formed in CUSP trap, undergoes Rabi-type spectroscopy and detected downstream dedicated detector. In parallel measurements using polarized hydrogen are being performed to commission apparatus perform parameters Standard Model Extension (SME). current status reviewed progress presented.
Abstract The ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration plans to measure the ground-state hyperfine splitting of antihydrogen in a beam at CERN Antiproton Decelerator with initial relative precision $$10^{-6}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>-</mml:mo><mml:mn>6</mml:mn></mml:mrow></mml:msup></mml:math> or better, test fundamental CPT (combination charge conjugation, parity...
We demonstrate a new temperature record for image-current mediated sympathetic cooling of single proton in cryogenic Penning trap by laser-cooled ^{9}Be^{+}. An axial mode 170 mK is reached, which 15-fold improvement compared to the previous best value. Our technique applicable any charged particle, so that measurements presented here constitute milestone toward next generation high-precision Penning-trap with exotic particles.
We demonstrate efficient subthermal cooling of the modified cyclotron mode a single trapped antiproton and reach particle temperatures T_{+}=E_{+}/k_{B} below 200 mK in preparation times shorter than 500 s. This corresponds to fastest resistive single-particle ever demonstrated. By particles such low energies, we detection spin transitions with an error rate <0.000 023, more 3 orders magnitude better previous best experiments. method has enormous impact on multi-Penning-trap experiments that...
The matter-antimatter asymmetry observed in the universe today still lacks a quantitative explanation. One possible mechanism that could contribute to imbalance is violation of combined Charge-, Parity- and Time symmetries (CPT). A test CPT symmetry using anti-atoms being carried out by ASACUSA-CUSP collaboration at CERN Antiproton Decelerator low temperature beam antihydrogen—the most simple atomic system built only antiparticles. While hydrogen abundant element universe, antihydrogen...
The ASACUSA Collaboration at CERNs Antiproton Decelerator aims to measure the ground state hyperfine splitting of antihydrogen with high precision test fundamental symmetry CPT (combination charge conjugation, parity transformation, and time reversal). For this purpose an detector has been developed. Its task is count arriving atoms therefore distinguish backgroundevents (mainly cosmics) from antiproton annihilations originating which are produced only in small amounts. A central BGO crystal...
The antihydrogen programme of the ASACUSA collaboration at antiproton decelerator CERN focuses on Rabi-type measurements ground-state hyperfine splitting for a test combined Charge-Parity-Time symmetry. spectroscopy apparatus consists microwave cavity to drive transitions and superconducting sextupole magnet quantum state analysis via Stern-Gerlach separation. However, small production rates forestall comprehensive performance studies apparatus. For this purpose hydrogen source detector have...
We present the design and characterization of a cryogenic window based on an ultra-thin aluminized biaxially oriented polyethylene terephthalate foil at T < 10 K, which can withstand pressure difference larger than 1 bar leak rate <1×10-9 mbar l/s. Its thickness ∼1.7 μm makes it transparent to various types particles over broad energy range. To optimize transfer 100 keV antiprotons through window, we tested degrading properties different aluminum coated polymer foils thicknesses between 900...
The BASE collaboration at the Antiproton Decelerator facility of CERN compares fundamental properties protons and antiprotons using advanced Penning-trap systems. In previous measurement campaigns, we measured magnetic moments proton antiproton, reaching (sub-)parts-in-a-billion fractional uncertainty. latest campaign, have compared antiproton charge-to-mass ratios with a uncertainty 16 parts in trillion. this contribution, give an overview detail how its results are used to constrain nine...
Currently, the world's only source of low-energy antiprotons is AD/ELENA facility located at CERN. To date, all precision measurements on single have been conducted this and provide stringent tests fundamental interactions their symmetries. However, magnetic field fluctuations from operation limit upcoming measurements. overcome limitation, we designed transportable antiproton trap system BASE-STEP to relocate laboratories with a calm environment. We anticipate that will facilitate enhanced...
The Standard Model (SM) of particle physics is both incredibly successful and glaringly incomplete. Among the questions left open striking imbalance matter antimatter in observable universe which inspires experiments to compare fundamental properties matter/antimatter conjugates with high precision. Our deal direct investigations protons antiprotons, performing spectroscopy advanced cryogenic Penning-trap systems. For instance, we compared proton/antiproton magnetic moments 1.5 ppb...
We present a fluorescence-detection system for laser-cooled 9Be+ ions based on silicon photomultipliers (SiPMs) operated at 4 K and integrated into our cryogenic 1.9 T multi-Penning-trap system. Our approach enables fluorescence detection in hermetically sealed Penning-trap chamber with limited optical access, where state-of-the-art using telescope room temperature would be extremely difficult. characterize the properties of SiPM cryocooler K, we measure dark count rate below 1 s-1...
An antihydrogen detector consisting of a thin BGO disk and surrounding plastic scintillator hodoscope has been developed. We have characterized the two-dimensional positions sensitivity energy deposition into was calibrated using cosmic rays by comparing experimental data with Monte-Carlo simulations. The particle tracks were defined connecting hit hits on bars. event rate investigated as function angles between in for simulated antiproton events, measured ray events. Identification Monte...
The mechanism of antiproton-nucleus annihilation at rest is not fully understood, despite substantial previous experimental and theoretical work. In this study we used slow extracted, sub-keV antiprotons from the ASACUSA apparatus CERN to measure charged particle multiplicities their energy deposits antiproton annihilations on three different nuclei: carbon, molybdenum gold. results are compared with predictions models in simulation tools Geant4 FLUKA. A model that accounts for all observed...
Abstract The mechanism of antiproton–nucleus annihilation at rest is not fully understood, despite substantial previous experimental and theoretical work. In this study we used slow extracted antiprotons from the ASACUSA apparatus CERN to measure charged particle multiplicities their energy deposits antiproton annihilations on three different nuclei: carbon, molybdenum gold. results are compared with predictions models in simulation tools Geant4 FLUKA. A model that accounts for all observed...