F. P. Gustafsson
A5103139227- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Superconducting and THz Device Technology
- Physics of Superconductivity and Magnetism
- Nuclear physics research studies
- Particle Detector Development and Performance
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Chemical Physics Studies
- Muon and positron interactions and applications
- Mass Spectrometry Techniques and Applications
- Advanced Frequency and Time Standards
- Particle accelerators and beam dynamics
- Superconductivity in MgB2 and Alloys
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Quantum Mechanics and Applications
- Dark Matter and Cosmic Phenomena
- Solid State Laser Technologies
- Optical properties and cooling technologies in crystalline materials
- Solar and Space Plasma Dynamics
- Crystallography and Radiation Phenomena
- Inorganic Fluorides and Related Compounds
- Microfluidic and Capillary Electrophoresis Applications
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
European Organization for Nuclear Research
2023-2025
Stefan Meyer Institute for Subatomic Physics
2022-2023
Austrian Academy of Sciences
2023
KU Leuven
2019-2021
National Institute of Standards and Technology
2017
Australian National University
2017
University of Burdwan
2017
Lund University
2015-2017
Nuclear charge radii are sensitive probes of different aspects the nucleon-nucleon interaction and bulk properties nuclear matter; thus, they provide a stringent test challenge for theory. The calcium region has been particular interest, as experimental evidence suggested new magic number at $N = 32$ [1-3], while unexpectedly large increases in [4,5] open questions about evolution size neutron-rich systems. By combining collinear resonance ionization spectroscopy method with $\beta$-decay...
Abstract Molecular spectroscopy offers opportunities for the exploration of fundamental laws nature and search new particle physics beyond standard model 1–4 . Radioactive molecules—in which one or more atoms possesses a radioactive nucleus—can contain heavy deformed nuclei, offering high sensitivity investigating parity- time-reversal-violation effects 5,6 Radium monofluoride, RaF, is particular interest because it predicted to have an electronic structure appropriate laser cooling 6 , thus...
We report on laser cooling of a large fraction positronium (Ps) in free flight by strongly saturating the 1^{3}S-2^{3}P transition with broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced magnetic and electric field-free environment. observe two different laser-induced effects. first effect an increase number atoms after time has spent long-lived 2^{3}P states. second one-dimensional Doppler Ps, reducing cloud's temperature from 380(20) to 170(20) K....
X-ray emission spectroscopy (XES) is a powerful element-selective tool to analyze the oxidation states of atoms in complex compounds, determine their electronic configuration, and identify unknown compounds challenging environments. Until now low efficiency wavelength-dispersive spectrometer technology has limited use XES, especially combination with weaker laboratory sources. More efficient energy-dispersive detectors have either insufficient energy resolution because statistical limits...
Isotope shifts of $^{223-226,228}$Ra$^{19}$F were measured for different vibrational levels in the electronic transition $A^{2}{}{\Pi}_{1/2}\leftarrow X^{2}{}{\Sigma}^{+}$. The observed isotope demonstrate particularly high sensitivity radium monofluoride to nuclear size effects, offering a stringent test models describing density within nucleus. Ab initio quantum chemical calculations are excellent agreement with experimental observations. These results highlight some unique opportunities...
Abstract A powerful and robust control system is a crucial, often neglected, pillar of any modern, complex physics experiment that requires the management multitude different devices their precise time synchronisation. The AEḡIS collaboration presents CIRCUS, novel, autonomous optimised for time-critical experiments such as those at CERN’s Antiproton Decelerator and, more broadly, in atomic quantum research. Its setup based on Sinara/ARTIQ TALOS, integrating ALPACA analysis pipeline, last...
We describe how the annihilation of antiprotons can be utilized to generate highly charged synthetic qubits in an ion-trap setup. identify qubit transitions hyperfine splitting Hydrogen-like atoms composed isomer and a single electron ground state. promising candidates isomers Y, Nb, Rh, In, Sb, for which transition lies infrared whose excited state level lifetime is hundreds milliseconds, suitable metrology applications.
Antihydrogen formation at AEgIS CERN leverages charge exchange between Rydberg positronium (Ps*) and antiprotons, with cross-sections scaling the Ps principal quantum number $n^4$ inversely relative velocity $𝑣^{−2}$. However, motional Stark effect mismatch antiprotons impose stringent constraints, limiting efficiency. Advances in transmission converters mitigate self-ionization losses improve alignment, promising a significant boost antihydrogen yield. This work evaluates cross-sections,...
The experimental demonstration of positronium laser cooling with stationary broadband pulses negative detuning is briefly described. Considerations on the limits current experiment and possible future developments follow. In particular, benefit positron remoderation, use a magnetic field, polarization, pulse shaping, coherent deceleration are shortly discussed.
Primary goal of the AEḡIS experiment is to precisely measure free fall antihydrogen within Earth’s gravitational field. To this end, cold (≈50 K) will traverse a two-grid moiré deflectometer before annihilating onto position-sensitive detector, which shall determine vertical position annihilation vertex relative grids with micrometric accuracy. Here, we introduce vertexing detector based on modified mobile camera sensor and experimentally demonstrate that it can antiproton annihilations...
With increasing demand for accurate calculation of isotope shifts atomic systems fundamental and nuclear structure research, an analytic energy derivative approach is presented in the relativistic coupled-cluster theory framework to determine field shift mass factors. This allows determination expectation values operators, overcoming problems that are present existing physics methods, i.e. it satisfies Hellmann-Feynman theorem, does not involve any non-terminating series, free from choice...
We have measured the 3d→2p transition x rays of kaonic ^{3}He and ^{4}He atoms using superconducting transition-edge-sensor microcalorimeters with an energy resolution better than 6 eV (FWHM). determined energies to be 6224.5±0.4(stat)±0.2(syst) 6463.7±0.3(stat)±0.1(syst) eV, widths 2.5±1.0(stat)±0.4(syst) 1.0±0.6(stat)±0.3(stat) for ^{4}He, respectively. These values are nearly 10 times more precise in previous measurements. Our results exclude large strong-interaction shifts that suggested...
High-resolution pionic atom X-ray spectroscopy was performed with an spectrometer based on a 240 pixel array of superconducting transition-edge sensor (TES) microcalorimeters at the πM1 beam line Paul Scherrer Institute. X-rays emitted by carbon via 4f→3d transition and parallel 4d→3p were observed full width half maximum energy resolution 6.8 eV 6.4 keV. The measured energies are consistent calculated electromagnetic values which considered strong interaction effect assessed Seki–Masutani...
This paper presents high-precision spectroscopic measurements of atomic tin using five different resonance-ionization schemes performed with the collinear spectroscopy technique. Isotope shifts were measured for stable isotopes from $5{s}^{2}5{p}^{2}\phantom{\rule{0.28em}{0ex}}^{3}{P}_{0,1,2}$ and ${}^{1}{S}_{0}$ to $5{s}^{2}5p6s\phantom{\rule{0.28em}{0ex}}^{1}{P}_{1},^{3}{P}_{1,2}$ $5{s}^{2}5p7s{\phantom{\rule{0.28em}{0ex}}}^{1}{P}_{1}$ levels. The magnetic dipole hyperfine constants...
At very low energies, a light neutral particle above horizontal surface can experience quantum reflection. The reflection holds the against gravity and leads to gravitational states (gqs). So far, gqs were only observed with neutrons as pioneered by Nesvizhevsky his collaborators at ill. However, existence of is predicted also for atoms. Grasian collaboration pursues first observation studies atomic hydrogen. We propose use atoms in order exploit fact that orders magnitude larger fluxes...
We are developing a new technique to apply transition-edge sensors (TESs) X-ray spectroscopy of exotic atoms, especially kaonic atoms. To demonstrate the feasibility this pioneering project, performance TES-based detector was evaluated in pion- and kaon-beam environments at particle accelerators. successfully observed X-rays from pionic-carbon atoms with resolution as good 7 eV FWHM 6 keV. Also kaon beamline, we confirmed that TES spectrometer will be able achieve our goal, eV, first...
A Correction to this paper has been published: https://doi.org/10.1038/s41567-021-01192-5.
Modern physics experiments are frequently very complex, relying on multiple simultaneous events to happen in order obtain the desired result. The experiment control system plays a central role orchestrating measurement setup: However, its development is often treated as secondary with respect hardware, importance becoming evident only during operational phase. Therefore, AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) collaboration has created framework for easily coding...
Our understanding of nuclear properties in the vicinity 100Sn, suggested to be heaviest doubly magic nucleus with equal numbers protons (Z=50) and neutrons (N=50), has been a long-standing challenge for experimental theoretical physics. Contradictory evidence exists on role collectivity this region chart. Using precision laser spectroscopy, we measured ground-state electromagnetic moments indium (Z=49) isotopes approaching N=50 neutron number down 101In, charge radii 101-131In spanning...
Methods for reducing the radius, temperature and space charge of a non-neutral plasma are usually reported conditions which approximate an ideal Penning Malmberg trap. Here, we show that (i) similar methods still effective under surprisingly adverse circumstances: perform strong drive regime (SDR) compression SDREVC in magnetic mirror field using only 3 out 4 rotating wall petals. In addition, demonstrate (ii) alternative to SDREVC, e-kick instead evaporative cooling (EVC) (iii) upper limit...