A5050849495- Atomic and Molecular Physics
- Nuclear physics research studies
- Advanced Chemical Physics Studies
- Particle physics theoretical and experimental studies
- Energy Harvesting in Wireless Networks
- Nuclear Physics and Applications
- Quantum Chromodynamics and Particle Interactions
- X-ray Spectroscopy and Fluorescence Analysis
- Mass Spectrometry Techniques and Applications
- RFID technology advancements
- Muon and positron interactions and applications
- Antenna Design and Analysis
- Radiopharmaceutical Chemistry and Applications
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle accelerators and beam dynamics
St Petersburg University
2011-2020
Kurchatov Institute
2014-2019
Institute for Theoretical and Experimental Physics
2017
In the search for nuclide with largest probability neutrinoless double-electron capture, we have determined Q(ϵϵ) value between ground states of (152)Gd and (152)Sm by Penning-trap mass-ratio measurements. The new 55.70(18) keV results in a half-life 10(26) yr 1 eV neutrino mass. With this smallest among known 0νϵϵ transitions, is promising candidate capture.
The theory of octupolar-excitation ion-cyclotron-resonance mass spectrometry is presented which predicts an increase up to several orders magnitude in resolving power under certain conditions. new method has been applied for a direct Penning-trap mass-ratio determination the (164)Er-(164)Dy doublet. (164)Er candidate search neutrinoless double-electron capture. However, measured Q(ϵϵ) value 25.07(12) keV results half-life 10(30) years 1 eV Majorana-neutrino mass.
A superposition of multiple resonance states in neutrinoless double-electron capture ${}^{156}\text{Dy}$ has been discovered. Penning-trap mass spectrometry used for atomic-mass-difference measurements and careful calculations electron wave functions double-hole binding energies have performed to determine the resonance-enhancement factors. Transitions four nuclear excited daughter nuclide ${}^{156}\text{Gd}$ identified as resonantly enhanced, including one with a full resonant enhancement,...
The Q values of double-electron capture in ${}^{124}$Xe, ${}^{130}$Ba, and ${}^{136}$Ce double-beta decay ${}^{124}$Sn ${}^{130}$Te have been determined with the Penning-trap mass spectrometer SHIPTRAP a few hundred eV uncertainty. These nuclides are members three isobaric triplets common daughter nuclides. main goal this work was to investigate existence resonant enhancement neutrinoless double-electron-capture rates ${}^{124}$Xe ${}^{130}$Ba order assess their suitability for search...
Relativistic calculations of the isotope shifts energy levels in highly charged Li-like ions are performed. The nuclear recoil (mass shift) contributions calculated by merging perturbative and large-scale configuration-interaction Dirac-Fock-Sturm (CI-DFS) methods. size (field evaluated CI-DFS method including electron-correlation, Breit, QED corrections. deformation polarization corrections to neodymium, thorium, uranium also considered. results compared with theoretical values obtained other
Isotope shifts of the 2$p_{3/2}$-2$p_{1/2}$ transition in B-like ions are evaluated for a wide range nuclear charge number: Z=8-92. The calculations relativistic recoil and size effects performed using large scale configuration-interaction Dirac-Fock-Sturm method. corresponding QED corrections also taken into account. results compared with theoretical values obtained other methods. accuracy isotope is significantly improved.
${}^{184}$Os has been excluded as a promising candidate for the search of neutrinoless double-electron capture. High-precision mass measurements with Penning-trap spectrometer TRIGA-TRAP result in marginal resonant enhancement $\ensuremath{\Delta}=\ensuremath{-}8.89(58)$ keV excess energy to 1322.152(22) ${0}^{+}$ excited state ${}^{184}$W. State-of-the-art density functional calculations are applied evaluation nuclear matrix elements states predicting strong suppression due large...
X-Ray transition energies and isotope shifts in heavy atoms are evaluated. The energy levels with vacancies the inner shells calculated within approximation of average nonrelativistic configuration employing Dirac-Fock-Sturm method. obtained results compared other configuration-interaction theoretical calculations experimental data.
The most precise to-date evaluation of the nuclear recoil effect on $n=1$ and $n=2$ energy levels He-like ions is presented in range $Z=12-100$. one-electron contribution calculated within framework rigorous QED approach to first order electron-to-nucleus mass ratio $m/M$ all orders parameter $\alpha Z$. two-electron term employing $1/Z$ perturbation theory. zeroth evaluated Z$, while using Breit approximation. corrections second higher are taken into account nonrelativistic approach....
Precise calculations of the isotope shifts in berylliumlike thorium and uranium ions are presented. The main contributions to field mass calculated within framework Dirac-Coulomb-Breit Hamiltonian employing configuration-interaction Dirac-Fock-Sturm method. These include relativistic, electron-electron correlation, Breit-interaction effects. QED, nuclear deformation, polarization corrections also evaluated.
Relativistic theory of the nuclear recoil effect in highly charged Li-like ions is considered within Breit approximation. The normal mass shift (NMS) and relativistic NMS (RNMS) are calculated by perturbation to zeroth first orders parameter 1/Z. calculations performed using dual kinetic balance method with basis functions constructed from B-splines. results compared theoretical values obtained other methods.