A5041415843- Nuclear physics research studies
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Mass Spectrometry Techniques and Applications
- Nuclear Physics and Applications
- Advanced Chemical Physics Studies
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Radioactive Decay and Measurement Techniques
- Atomic and Subatomic Physics Research
- Laser-induced spectroscopy and plasma
- Radioactive element chemistry and processing
- Quantum Chromodynamics and Particle Interactions
- Ion-surface interactions and analysis
- Molecular Junctions and Nanostructures
- Catalytic Processes in Materials Science
- Radioactive contamination and transfer
- Nanocluster Synthesis and Applications
- Astro and Planetary Science
- nanoparticles nucleation surface interactions
- Nuclear reactor physics and engineering
- Advanced Materials Characterization Techniques
- Analytical chemistry methods development
- Chemical Thermodynamics and Molecular Structure
Facility for Antiproton and Ion Research
2012-2023
Heidelberg University
2017
Kirchhoff (Germany)
2017
European Organization for Nuclear Research
2006-2016
University of Manchester
2014
Universität Greifswald
2002-2012
Max Planck Institute for Nuclear Physics
2009-2010
Max Planck Society
2009-2010
Johannes Gutenberg University Mainz
1999-2009
National Superconducting Cyclotron Laboratory
2009
ISOLTRAP is a Penning trap mass spectrometer for high-precision measurements on short-lived nuclides installed at the on-line isotope separator ISOLDE CERN. The masses of close to 300 radionuclides have been determined up now. applicability spectrometry exotic nuclei has extended considerably by improving and developing this double over past two decades. accurate determination nuclear binding energies far from stability includes that are produced rates less than 100 ions/s with half-lives...
Ramsey's method of separated oscillatory fields is applied to the excitation cyclotron motion short-lived ions in a Penning trap improve precision their measured mass values. The theoretical description extracted ion-cyclotron-resonance line shape derived and its correctness demonstrated experimentally by measuring $^{38}\mathrm{Ca}$ nuclide with an uncertainty $1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ using spectrometer ISOLTRAP at CERN. superallowed beta emitter...
High-precision mass and charge radius measurements on $^{17--22}\mathrm{Ne}$, including the proton-halo candidate $^{17}\mathrm{Ne}$, have been performed with Penning trap spectrometry collinear laser spectroscopy. The $^{17}\mathrm{Ne}$ uncertainty is improved by factor 50, radii of $^{17--19}\mathrm{Ne}$ are determined for first time. fermionic molecular dynamics model explains pronounced changes in ground-state structure. It attributes large to an extended proton configuration ${s}^{2}$...
A high-precision direct Penning trap mass measurement has revealed a 0.5-MeV deviation of the binding energy $^{134}\mathrm{Sn}$ from currently accepted value. The corrected assignment this neutron-rich nuclide restores neutron-shell gap at $N=82$, previously considered to be case ``shell quenching.'' In fact, new shell value for short-lived $^{132}\mathrm{Sn}$ is larger than that doubly magic $^{48}\mathrm{Ca}$ which stable. $N=82$ considerable impact on fission recycling during $r$...
Mass measurements of (96,97)Kr using the ISOLTRAP Penning-trap spectrometer at CERN-ISOLDE are reported, extending mass surface beyond N=60 for Z=36. These new results show behavior in sharp contrast to heavier neighbors where a sudden and intense deformation is present. We interpret this as establishment nuclear quantum phase transition critical-point boundary. The masses confirm findings from mean-square charge-radius up but variance with conclusions recent gamma-ray spectroscopy.
We probe the N=82 nuclear shell closure by mass measurements of neutron-rich cadmium isotopes with ISOLTRAP spectrometer at ISOLDE-CERN. The new ^{132}Cd offers first value N=82, two-neutron gap below Z=50 and confirms phenomenon mutually enhanced magicity ^{132}Sn. Using recently implemented phase-imaging ion-cyclotron-resonance method, ordering low-lying isomers in ^{129}Cd their energies are determined. experimental findings used to test large-scale shell-model, mean-field,...
High-precision mass measurements on neutron-rich zinc isotopes $^{71m,72--81}\mathrm{Zn}$ have been performed with the Penning trap spectrometer ISOLTRAP. For first time, of $^{81}\mathrm{Zn}$ has experimentally determined. This makes $^{80}\mathrm{Zn}$ few major waiting points along path astrophysical rapid neutron-capture process where neutron-separation energy and $Q$-value are determined experimentally. The conditions required for this point its associated abundance signatures to occur...
The masses of the neutron-rich radon isotopes {223-229}Rn have been determined for first time, using ISOLTRAP setup at CERN ISOLDE. In addition, this experiment marks discovery a new nuclide, 229Rn, by Penning-trap mass measurement. new, high-accuracy data allow fine examination surface, via valence-nucleon interaction deltaV{pn}. results reveal intriguing behavior, possibly reflecting either N=134 subshell closure or an octupolar deformation in region.
Singly charged gold cluster anions in the size range n = 16–30 have been captured, stored and selected a Penning trap. After application of an electron beam doubly observed for 20 ≤ 30. To our knowledge this is first observation metal dianions. The threshold appearance good agreement with simple sphere model. argon gas pulses simultaneously found to increase production rate by order magnitude.
Mass measurements with a relative precision of better than 1.5 x 10(-8) were performed on 22Mg and its reaction partners 21Na 22Na the ISOLTRAP Penning trap mass spectrometer at CERN, yielding excesses D(22Mg)=-399.92(27) keV, D(21Na)=-2184.71(21) D(22Na)=-5181.56(16) keV. The importance these results is twofold. First, comparative half-life (Ft value) has been obtained for superallowed beta decay to further test conserved-vector-current hypothesis. Second, resonance energy proton capture...
Mass measurements on radionuclides along the potassium isotope chain have been performed with ISOLTRAP Penning trap mass spectrometer. For $^{35}\mathrm{K}$ (${T}_{1/2}=178$ ms) to $^{46}\mathrm{K}$ (${T}_{1/2}=105$ s) relative uncertainties of $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ and better achieved. The accurate determination ($\ensuremath{\delta}m=0.54$ keV) has exploited test isobaric multiplet equation for $A=35,T=3/2$ isospin quartet. experimental results...
The atomic masses of the neutron-deficient radioactive rubidium isotopes $^{74\ensuremath{-}77,79,80,83}\mathrm{Rb}$ have been measured with Penning trap mass spectrometer ISOLTRAP. Using time-of-flight cyclotron resonance technique, relative uncertainties ranging from $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ to $5.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ were achieved. In all cases, precision was significantly improved as compared prior Atomic-Mass...
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 $^{110}\mathrm{Pd}$ double-$\ensuremath{\beta}$ decay $Q$ value was measured with the Penning-trap mass spectrometer ISOLTRAP to be $Q=2017.85(64)\text{ }\text{ }\mathrm{keV}$. This shifted by 14 keV compared literature and is 17 times more precise, resulting in new phase-space factors for two-neutrino neutrinoless modes. In addition a set of relevant matrix elements has been calculated. expected half-life mode reevaluated as $1.5(6)\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{...
Formation and stability patterns of silver dianionic gold trianionic clusters are investigated with Penning-trap experiments a shell-correction method including shape deformations. The theoretical predictions pertaining to the appearance sizes electronic shell effects in remarkable agreement experiments. Decay multiply anionic occurs predominantly by electron tunneling through Coulomb barrier rather than via fission, leading unrelated those cationic clusters.
The atomic masses of the neutron-rich krypton isotopes $^{84,86\ensuremath{-}95}\mathrm{Kr}$ have been determined with tandem Penning trap mass spectrometer ISOLTRAP uncertainties ranging from 20 to 220 ppb. short-lived $^{94}\mathrm{Kr}$ and $^{95}\mathrm{Kr}$ were measured for first time. radioactive nuclides $^{89}\mathrm{Kr}$ $^{91}\mathrm{Kr}$ disagree by 4 6 standard deviations, respectively, present Atomic-Mass Evaluation database. resulting modification surface respect two-neutron...
Mass measurements of neutron-rich Cd and Ag isotopes were performed with the Penning trap mass spectrometer ISOLTRAP. The masses ${}^{112,114\ensuremath{-}124}$Ag ${}^{114,120,122\ensuremath{-}124,126,128}$Cd, determined relative uncertainties between $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$, resulted in significant corrections improvements surface. In particular, $^{124}\mathrm{Ag}$ was previously unknown....
Isomers close to doubly magic Ni502878 provide essential information on the shell evolution and shape coexistence near Z=28 N=50 double closure. We report excitation energy measurement of 1/2+ isomer in Zn493079 through independent high-precision mass measurements with JYFLTRAP Penning trap ISOLTRAP multi-reflection time-of-flight spectrometer. unambiguously place at 942(10) keV, slightly below 5/2+ state 983(3) keV. With use state-of-the-art shell-model diagonalizations, complemented...
We describe and apply a new procedure that allows direct determination of dissociation energies polyatomic systems (clusters, fullerenes, polymers, other molecules) without any modeling the under investigation. As an example, we have determined series gold clusters Au(+)n. A comparison with values obtained from statistical models unimolecular shows these significantly fail to data. In contrast, method yields which are order magnitude more accurate, thus allowing one experimentally set...