A5032968831- Atomic and Molecular Physics
- Nuclear physics research studies
- Neutrino Physics Research
- Mass Spectrometry Techniques and Applications
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Radioactive Decay and Measurement Techniques
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- Nuclear Physics and Applications
- Analytical Chemistry and Sensors
- Semiconductor materials and devices
- Cold Atom Physics and Bose-Einstein Condensates
- Particle physics theoretical and experimental studies
- Quantum, superfluid, helium dynamics
- Dark Matter and Cosmic Phenomena
- Integrated Circuits and Semiconductor Failure Analysis
- Particle accelerators and beam dynamics
- Radioactive element chemistry and processing
- Electrochemical Analysis and Applications
- Inorganic and Organometallic Chemistry
- Ion-surface interactions and analysis
- History and advancements in chemistry
- Inorganic Chemistry and Materials
- Diamond and Carbon-based Materials Research
Max Planck Institute for Nuclear Physics
2017-2025
Heidelberg University
2025
Neutrinos, and in particular their tiny but non-vanishing masses, can be considered one of the doors towards physics beyond Standard Model. Precision measurements kinematics weak interactions, 3H β-decay 163Ho electron capture (EC), represent only model independent approach to determine absolute scale neutrino masses. The experiment, ECHo, is designed reach sub-eV sensitivity on mass by means analysis calorimetrically measured spectrum nuclide 163Ho. maximum energy available for this decay,...
In this Letter, we present mass-ratio measurements on highly charged <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msup><a:mrow><a:mi>Yb</a:mi></a:mrow><a:mrow><a:mn>42</a:mn><a:mo>+</a:mo></a:mrow></a:msup></a:mrow></a:math> ions with a precision of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mn>4</c:mn><c:mo>×</c:mo><c:msup><c:mn>10</c:mn><c:mrow><c:mo>−</c:mo><c:mn>12</c:mn></c:mrow></c:msup></c:math> and isotope-shift...
Abstract The investigation of the absolute scale effective neutrino mass remains challenging due to exclusively weak interaction neutrinos with all known particles in standard model particle physics. At present, most precise and least-model-dependent upper limit on electron antineutrino is set by Karlsruhe Tritium Neutrino Experiment (KATRIN) from analysis tritium β-decay. Another promising approach capture 163 Ho, which under using microcalorimetry Electron Capture Holmium (ECHo) HOLMES...
The atomic mass of uranium-238 has been determined to be <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mn>238.050</a:mn><a:mspace width="0.16em"/><a:mn>787</a:mn><a:mspace width="0.16em"/><a:mn>618</a:mn><a:mo>(</a:mo><a:mn>15</a:mn><a:mo>)</a:mo></a:mrow></a:math> u, improving the literature uncertainty by two orders magnitude. It is obtained from a measurement ratio <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"><d:mmultiscripts><d:mi...
The cyclotron frequency ratio of ${^{187}\mathrm{Os}}^{29+}$ to ${^{187}\mathrm{Re}}^{29+}$ ions was measured with the Penning-trap mass spectrometer PENTATRAP. achieved result $R=1.000\text{ }000\text{ }013\text{ }882(5)$ is date most precise such measurement performed on ions. Furthermore, total binding-energy difference 29 missing electrons in Re and Os calculated by relativistic multiconfiguration methods, yielding value $\mathrm{\ensuremath{\Delta}}E=53.5(10)\text{ }\text{...
We present the measurements of individual bound electron $g$ factors ${^{20}\mathrm{Ne}}^{9+}$ and ${^{22}\mathrm{Ne}}^{9+}$ on relative level 0.1 parts per billion. The comparison with theory represents most stringent test bound-state QED in strong electric fields. A dedicated mass measurement results $m(^{20}\mathrm{Ne})=\phantom{\rule{0ex}{0ex}}19.992\text{ }440\text{ }168\text{ }77(9)\text{ }\text{ }\mathrm{u}$, which improves current literature value by a factor 18, disagrees 4 standard...
Abstract The determination of the effective electron neutrino mass via kinematic analysis beta and capture spectra is considered to be model-independent since it relies on energy momentum conservation. At same time precise description expected spectrum goes beyond simple phase space term. In particular for processes, many-body electron-electron interactions lead additional structures besides main resonances in calorimetrically measured spectra. A $$^{163}$$ <mml:math...
First ever measurements of the ratios free cyclotron frequencies heavy highly charged ions with Z>50 relative uncertainties close to 1e-11 are presented. Such accurate have become realistic due construction novel cryogenic multi-Penning-trap mass spectrometer PENTATRAP. Based on measured frequency ratios, differences five pairs stable xenon isotopes, ranging from 126Xe 134Xe, been determined. Moreover, first direct measurement an electron binding energy in a ion, namely 37th atomic xenon,...
Highly charged ions (HCIs) offer many opportunities for next-generation clock research due to the vast landscape of available electronic transitions in different charge states. The development extreme ultraviolet frequency combs has enabled search based on shorter wavelengths HCIs. However, without initial knowledge energy states, these narrow are difficult be probed by lasers. In this Letter, we provide experimental observation and theoretical calculation a long-lived state Nb-like Pb^{41+}...
The absolute atomic mass of $^{208}$Pb has been determined with a fractional uncertainty $7\times 10^{-11}$ by measuring the cyclotron-frequency ratio $R$ $^{208}$Pb$^{41+}$ to $^{132}$Xe$^{26+}$ high-precision Penning-trap spectrometer Pentatrap and computing binding energies $E_{\text{Pb}}$ $E_{\text{Xe}}$ missing 41 26 electrons, respectively, ab initio fully relativistic multi-configuration Dirac-Hartree-Fock (MCDHF) method. measured relative precision $9\times 10^{-12}$. have computed...
The Standard Model of particle physics describes the properties elementary particles and their interactions remarkably well, but in particular does not account for dark matter. Isotope-shift spectroscopy is a sensitive probe fifth forces new that illuminate matter sector. This method sets bounds on bosons couple neutrons electrons with masses keV/c2 to MeV/c2 range. With increasing spectroscopic precision, such searches are limited by uncertainties isotope understanding nuclear structure....
A high-precision Penning-trap experiment was operated with a programmable 20 V Josephson voltage source, providing significantly higher stability of the electrostatic trapping potential. This increased motional frequency trapped ion by about factor two respect to state-of-the-art sources. An absolute axial 7.8(6) mHz corresponding relative precision 9.7(8)×10−9 at 795 kHz demonstrated using 9Be3+ as measurement probe. The enhanced in potential opens up possibility for improved determinations...
This paper reports on the development and testing of a novel, highly efficient technique for injection very rare species into electron beam ion traps (EBITs) production charged ions (HCI). It relies in-trap laser-induced desorption atoms from sample brought close to resulting in high capture efficiency EBIT. We have demonstrated steady HCI stable isotope 165Ho samples only 1012 (∼300 pg) charge states up 45+. these can be subsequently extracted use other experiments or stored trapping volume...
Nonlinearities in King plots (KP) of isotope shifts (IS) can reveal the existence beyond-Standard-Model (BSM) interactions that couple electrons and neutrons. However, it is crucial to distinguish higher-order Standard Model (SM) effects from BSM physics. We measure IS transitions ${{}^{3}P_{0}~\rightarrow~{}^{3}P_{1}}$ $\mathrm{Ca}^{14+}$ ${{}^{2}S_{1/2} \rightarrow {}^{2}D_{5/2}}$ $\mathrm{Ca}^{+}$ with sub-Hz precision as well nuclear mass ratios relative uncertainties below...
The definition of the absolute neutrino mass scale is one main goals Particle Physics today. study end-point regions $\beta$- and electron capture (EC) spectrum offers a possibility to determine effective (anti-)neutrino in completely model independent way, as it only relies on energy momentum conservation. ECHo (Electron Capture $^{163}$Ho) experiment has been designed attempt measure by performing high statistics resolution measurements $^{163}$Ho spectrum. To achieve this goal, large...
In this paper, we report on the development of a fast high-voltage switch, which is based two enhancement mode N-channel silicon carbide metal-oxide-semiconductor field-effect transistors in push-pull configuration. The switch capable switching high voltages up to 600 V capacitive loads with rise and fall times order 10 ns pulse widths ≥20 ns. Using it was demonstrated that, from charge state distribution bunches highly charged ions ejected an electron beam ion trap specific kinetic energy,...
We present the measurements of individual bound electron $g$ factors $^{20}\text{Ne}^{9+}$ and $^{22}\text{Ne}^{9+}$ on relative level $0.1\,\text{parts}$ per billion. The comparison with theory represents most stringent test bound-state QED in strong electric fields. A dedicated mass measurement results $m\left(^{20}\text{Ne}\right)=19.992\,440\,168\,77\,(9)\,\text{u}$, which improves current literature value by a factor nineteen, disagrees $4$ standard deviations precisely measured atomic...
Highly charged ions (HCIs) offer many opportunities for next-generation clock research due to the vast landscape of available electronic transitions in different charge states. The development XUV frequency combs has enabled search based on shorter wavelengths HCIs. However, without initial knowledge energy states, these narrow are difficult be probed by lasers. In this Letter, we provide experimental observation and theoretical calculation a long-lived state Nb-like Pb$^{41+}$ which could...
The atomic mass of uranium-238 has been determined to be $238.050\,787\,618(15)\,\text{u}$, improving the literature uncertainty by two orders magnitude. It is obtained from a measurement ratio $^{238}$U$^{47+}$ and $^{132}$Xe$^{26+}$ ions with an $3.5\times 10^{-12}$. was carried out Penning-trap spectrometer \textsc{Pentatrap} accompanied calculation binding energies $E_{\text{U}}$ $E_{\text{Xe}}$ 47 26 missing electrons highly charged ions, respectively. These were using \textit{ab...
The possibility of applying active feedback to a single ion in Penning trap using fully digital system is demonstrated. Previously realized systems rely on analog circuits that are susceptible environmental fluctuations and long term drifts, as well being limited the specific task they were designed for. presented implemented field-programmable gate array (FPGA)-based platform (STEMlab), offering greater flexibility, higher temporal stability, for highly dynamic variation parameters....