A5080752163- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Mass Spectrometry Techniques and Applications
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Quantum Information and Cryptography
- Advanced Chemical Physics Studies
- Laser-induced spectroscopy and plasma
- Computational Physics and Python Applications
- Nuclear reactor physics and engineering
- Advanced Frequency and Time Standards
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Analytical chemistry methods development
- Ion-surface interactions and analysis
The University of Sydney
2019-2024
ARC Centre of Excellence for Engineered Quantum Systems
2019-2024
University of Antwerp
2017-2024
Institute of High Energy Physics
2011-2024
A. Alikhanyan National Laboratory
2024
Karlsruhe Institute of Technology
2015-2024
Universität Greifswald
2013-2023
Max Planck Institute for Nuclear Physics
2014-2023
Massachusetts Institute of Technology
2012-2014
European Organization for Nuclear Research
2012-2013
Modeling the composition of neutron-star crusts depends strongly on binding energies neutron-rich nuclides near $N=50$ and $N=82$ shell closures. Using a recent development time-of-flight mass spectrometry for on-line purification radioactive ion beams to access more exotic species, we have determined first time $^{82}\mathrm{Zn}$ with ISOLTRAP setup at ISOLDE-CERN facility. With robust model based nuclear energy-density-functional theory, solve general relativistic...
The recently confirmed neutron-shell closure at N = 32 has been investigated for the first time below magic proton number Z 20 with mass measurements of exotic isotopes 52,53K, latter being shortest-lived nuclide online spectrometer ISOLTRAP. resulting two-neutron separation energies reveal a 3 MeV shell gap 32, slightly lower than 52Ca, highlighting doubly-magic nature this nuclide. Skyrme-Hartree-Fock-Boguliubov and ab initio Gorkov-Green function calculations are challenged by new but...
The mean-square charge radii of $^{207,208}\mathrm{Hg}$ ($Z=80$, $N=127$, 128) have been studied for the first time and those $^{202,203,206}\mathrm{Hg}$ ($N=122$, 123, 126) remeasured by application in-source resonance-ionization laser spectroscopy at ISOLDE (CERN). characteristic kink in $N=126$ neutron shell closure has revealed, providing information on its behavior below $Z=82$ proton closure. A theoretical analysis performed within relativistic Hartree-Bogoliubov nonrelativistic...
The masses of the neutron-rich copper isotopes Cu75–79 are determined using precision mass spectrometer ISOLTRAP at CERN-ISOLDE facility. trend from new data differs significantly that previous results, offering a first accurate view surface adjacent to Z=28, N=50 nuclide Ni78 and supporting doubly magic character. compare very well with large-scale shell-model calculations predict shape coexistence in island inversion for Z<28. A coherent picture this important exotic region begins emerge...
Masses adjacent to the classical waiting-point nuclide ^{130}Cd have been measured by using Penning-trap spectrometer ISOLTRAP at ISOLDE/CERN. We find a significant deviation of over 400 keV from earlier values evaluated nuclear beta-decay data. The new measurements show reduction N=82 shell gap below doubly magic ^{132}Sn. nucleosynthesis associated with ejected wind type-II supernovae as well compact object binary mergers is studied, state-of-the-art hydrodynamic simulations. consistent...
Electron beam ion traps (EBITs) are ideal tools for both production and study of highly charged ions (HCIs). In order to reduce their construction, maintenance, operation costs, we have developed a novel, compact, room-temperature design, the Heidelberg Compact EBIT (HC-EBIT). Four already commissioned devices operate at strongest fields (up 0.86 T) reported such EBITs using permanent magnets, run electron currents up 80 mA, energies 10 keV. They demonstrate HCI production, trapping,...
The neutron-deficient Hg isotopes have been a paradigm for nuclear shape coexistence. ground states of these nuclei exhibit striking structural differences from the neighboring Pb isotopes, and are very challenging to study experimentally. Here, new state-of-the-art data extend information on charge radii (and electromagnetic moments) lightest ever measured using laser spectroscopy. results suggest sudden decrease in deformation an end region ground-state staggering. These provide...
We have measured the ground-state $g$ factor of boronlike argon ${^{40}\mathrm{Ar}}^{13+}$ with a fractional uncertainty $1.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ single ion in newly developed Alphatrap double Penning-trap setup. The value $g=0.663\text{ }648\text{ }455\text{ }32(93)$ obtained here is agreement our theoretical prediction 0.663 648 12(58). latter accounting for quantum electrodynamics, electron correlation, and nuclear effects within state-of-the-art...
The ALPHATRAP experiment at the Max-Planck Institute for Nuclear Physics in Heidelberg aims probing validity of quantum electrodynamics extremely strong electromagnetic fields. To this end, will determine value magnetic moment, or g-factor, electron bound highly charged ions. Quantum predicts with extraordinary precision. As ions is exposed to strongest fields available high-precision spectroscopy laboratory, reaching up 1016 V/cm hydrogenlike lead 208Pb81+, a comparison theoretical...
Abstract The tin isotope 100 Sn is of singular interest for nuclear structure due to its closed-shell proton and neutron configurations. It also the heaviest nucleus comprising protons neutrons in equal numbers—a feature that enhances contribution short-range proton–neutron pairing interaction strongly influences decay via weak interaction. Decay studies region have attempted prove doubly magic character 1 but few studied it from an ab initio theoretical perspective 2,3 , none these has...
The neutron-rich isotopes $^{58-63}$Cr were produced for the first time at ISOLDE facility and their masses measured with ISOLTRAP spectrometer. new values are up to 300 times more precise than those in literature indicate significantly different nuclear structure from mass-surface trend. A gradual onset of deformation is found this proton neutron mid-shell region, which a gateway second island inversion around \emph{N}=40. In addition comparisons density-functional theory large-scale...
Hyperfine-structure parameters and isotope shifts of $^{195--211}\mathrm{At}$ have been measured for the first time at CERN-ISOLDE, using in-source resonance-ionization spectroscopy method. The hyperfine structures isotopes were recorded a triad experimental techniques monitoring photo-ion current. Multi-Reflection Time-of-Flight Mass Spectrometer, in connection with high-resolution electron multiplier, was used as an ion-counting setup that either affected by strong isobaric contamination...
High-precision mass measurements of neutron-rich ${}^{57\ensuremath{-}66}$Mn and ${}^{61\ensuremath{-}63}$Fe isotopes are reported. The new surface shows no shell closure at $N=40$. In contrast, there is an increase the two-neutron separation energy $N=38$. This behavior consistent with onset collectivity due to occupation intruder states from higher orbits, in analogy well known ``island inversion'' around $N=20$. Our results indicate that Mn isotopes, starting ${}^{63}$Mn, most likely...
The nuclear mass region around $\ensuremath{\approx}100$ is one of the most important for understanding origin non-spherical shapes in heavy nuclei, as well evolution from spherical to deformed a function neutron and proton number. Precise measurements are often key delineating such regions structural change. present paper, using state-of-the-art Penning-trap time-of-flight spectrometry techniques, further maps out locus shape change this through new masses, particularly rubidium isotopes....
Hyperfine-structure constants for the $6s{\phantom{\rule{0.28em}{0ex}}}^{2}{S}_{1/2}$ and $6p{\phantom{\rule{0.28em}{0ex}}}^{2}{P}_{1/2}$ atomic states of ${I}^{\ensuremath{\pi}}=11/{2}^{\ensuremath{-}}$ gold isomers $^{177,191,193,195}\mathrm{Au}^{m}$ have been measured at CERN-ISOLDE, using in-source laser resonance-ionization spectroscopy technique. From hyperfine differences between anomalies these deduced. These differential anomaly values used to determine $6s$-state relative stable...