A5004943413- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Astronomical and nuclear sciences
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Radioactive Decay and Measurement Techniques
- Advanced NMR Techniques and Applications
- Chalcogenide Semiconductor Thin Films
- Integrated Circuits and Semiconductor Failure Analysis
- Plant and animal studies
- Particle accelerators and beam dynamics
- Rare-earth and actinide compounds
- Animal Behavior and Reproduction
- Solar and Space Plasma Dynamics
- Quantum Chromodynamics and Particle Interactions
- Sensor Technology and Measurement Systems
- Neutrino Physics Research
- Advanced Measurement and Detection Methods
- Advanced Frequency and Time Standards
- Spectroscopy and Laser Applications
KU Leuven
2025
Michigan State University
2019-2024
National Superconducting Cyclotron Laboratory
2019-2022
Augustana University
2019
Helmholtz-Zentrum Berlin für Materialien und Energie
2019
The nuclear charge radius of $^{32}\mathrm{Si}$ was determined using collinear laser spectroscopy. experimental result confronted with ab initio lattice effective field theory, valence-space in-medium similarity renormalization group, and mean calculations, highlighting important achievements challenges modern many-body methods. completes the radii mirror pair $^{32}\mathrm{Ar}\text{\ensuremath{-}}^{32}\mathrm{Si}$, whose difference correlated to slope $L$ symmetry energy in equation state....
A comparative vacuum ultraviolet spectroscopy study conducted at ISOLDE-CERN of the radiative decay <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>Th</a:mi><a:mprescripts/><a:none/><a:mrow><a:mn>229</a:mn><a:mi>m</a:mi></a:mrow></a:mmultiscripts></a:math> nuclear clock isomer embedded in different host materials is reported. The ratio number photons and <b:math...
The nuclear root-mean-square charge radius of ^{54}Ni was determined with collinear laser spectroscopy to be R(^{54}Ni)=3.737(3) fm. In conjunction the known mirror nucleus ^{54}Fe, difference radii extracted as ΔR_{ch}=0.049(4) Based on correlation between ΔR_{ch} and slope symmetry energy at saturation density (L), we deduced 21≤L≤88 MeV. present result is consistent L from binary neutron star merger GW170817, favoring a soft matter EOS, barely PREX-2 within 1σ error bands. Our indicates...
Nuclear charge radii of $^{55,56}\mathrm{Ni}$ were measured by collinear laser spectroscopy. The obtained information completes the behavior at shell closure doubly magic nucleus $^{56}\mathrm{Ni}$. trend across closures in calcium and nickel is surprisingly similar despite fact that $^{56}\mathrm{Ni}$ core supposed to be much softer than $^{48}\mathrm{Ca}$ core. very low magnetic moment $\ensuremath{\mu}(^{55}\mathrm{Ni})=\ensuremath{-}1.108(20)\text{ }\text{ }{\ensuremath{\mu}}_{N}$...
Charge radii of the unstable Ca36 and Ca38 nuclei were recently determined used to compute differences in charge between mirror ΔRch for Ca36−S36 Ca38−Ar38 pairs. Given correlation slope symmetry energy L at nuclear saturation density, we deduce L=5–70 MeV, which rules out a large fraction models that predict "stiff" equation state. This is most precise determination this model based on electromagnetic probes ground states. The range consistent with earlier analyses from both laboratory...
Charge radii of neutron deficient 40Sc and 41Sc nuclei were determined using collinear laser spectroscopy. With the new data, chain Sc charge extends below magic number N=20 shows a pronounced kink, generally taken as signature shell closure, but one notably absent in neighboring Ca, K Ar isotopic chains. Theoretical models that explain trend at for Ca isotopes cannot reproduce this puzzling behavior.
The hyperfine coupling constants of neutron deficient $^{37}\mathrm{Ca}$ were deduced from the atomic spectrum $4s\phantom{\rule{0.16em}{0ex}}^{2}S_{1/2}\phantom{\rule{0.16em}{0ex}}\ensuremath{\leftrightarrow}\phantom{\rule{0.16em}{0ex}}4p\phantom{\rule{0.16em}{0ex}}^{2}P_{3/2}$ transition in Ca ii, measured using collinear laser spectroscopy technique. ground-state magnetic-dipole and spectroscopic electric-quadrupole moments determined for first time as...
An approach to determine the kinetic beam energy at ${10}^{\ensuremath{-}5}$ level is presented, which corresponds an improvement by more than one order of magnitude compared with conventional methods. Particularly, collinear fluorescence and resonance-ionization spectroscopy measurements on rare-isotope beams, where a major contribution uncertainty, can benefit from this method. The based requires no special equipment besides wavelength meter, commonly available. Its advent demonstrated in...
Abstract Mating displays often contain multiple signals. Different combinations of these signals may be equally successful at attracting a mate, as environment and signal combination influence relative weighting by choosy individuals. This variation in among individuals facilitate the maintenance polymorphic signalling behaviour. One group animals known for their patterning are Batesian mimetic butterflies, where interaction sexual selection predation pressures is hypothesized to wing Males...
The isotope shifts of the $3{d}^{9}4s^{3}D_{3}\ensuremath{\rightarrow}3{d}^{9}4p^{3}P_{2}$ transition in stable even-even nickel isotopes were measured. An improved accuracy was achieved by transforming systematic contribution wavelength-meter-based laser-frequency measurement into a statistical-acting measuring same observables at different frequency sets. A detailed King-fit analysis performed to extract mass-shift and field-shift parameters, which are crucial for determination charge...
The hyperfine coupling constants of the proton dripline odd-odd $^{40}\mathrm{Sc}$ nucleus were deduced from spectrum $3d4s{\phantom{\rule{0.16em}{0ex}}}^{3}{\text{D}}_{2}\ensuremath{\leftrightarrow}3d4p{\phantom{\rule{0.16em}{0ex}}}^{3}{\text{F}}_{3}^{\ensuremath{\circ}}$ transition in Sc II, measured by bunched beam collinear laser spectroscopy technique. ground-state magnetic-dipole and electric-quadrupole moments determined as $\ensuremath{\mu}=+5.57(4)(2){\ensuremath{\mu}}_{N}$...
A comparative vacuum ultraviolet spectroscopy study conducted at ISOLDE-CERN of the radiative decay $^{229m}$Th nuclear clock isomer embedded in different host materials is reported. The ratio number photons and are determined for single crystalline CaF$_2$, MgF$_2$, LiSrAlF$_6$, AlN, amorphous SiO$_2$. For latter two materials, no signal was observed an upper limit wavelength LiSrAlF$_6$ reducing its uncertainty by a factor 2.5 relative to our previous measurement. This value agreement with...
The measurement of surface photovoltage (SPV) transients over 12 orders magnitude in time was recently demonstrated [Rev. Sci. Instrum. 88, 053904 (2017)]. In dedicated experiments, however, a high-impedance buffer shall be placed outside the chamber, which has consequences for SPV measurements at very short times. By varying LCR circuit configuration, applying multi-parameter fit and simulating corresponding transients, we show, on examples highly doped silicon CdS thin film, that source...
Collinear laser spectroscopy experiments were performed on singly charged $^{45}\mathrm{Sc}$ ($^{45}\mathrm{Sc}$ II). Fourteen fine-structure transitions in the $3d4s\ensuremath{\leftrightarrow}3d4p$ configuration studied for three sets of triplet states, ${}^{3}{D}_{1}, {}^{3}{D}_{2}$, and ${}^{3}{D}_{3}$ states $3d4s$ ${}^{3}{F}_{2}^{o}, {}^{3}{F}_{3}^{o}, {}^{3}{F}_{4}^{o}, {}^{3}{D}_{1}^{o}, {}^{3}{D}_{2}^{o}$, ${}^{3}{D}_{3}^{o}$ $3d4p$ configuration. Furthermore, hyperfine magnetic...
The nuclear charge radius of $^{32}$Si was determined using collinear laser spectroscopy. experimental result confronted with ab initio lattice effective field theory, valence-space in-medium similarity renormalization group, and mean calculations, highlighting important achievements challenges modern many-body methods. completes the radii mirror pair $^{32}$Ar - $^{32}$Si, whose difference correlated to slope $L$ symmetry energy in equation state. Our suggests $L \leq 60$\,MeV, which agrees...