M. Lestinsky
A5060454417- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Laser-induced spectroscopy and plasma
- Electron and X-Ray Spectroscopy Techniques
- Muon and positron interactions and applications
- Ion-surface interactions and analysis
- Astro and Planetary Science
- Photocathodes and Microchannel Plates
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced NMR Techniques and Applications
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Plasma Diagnostics and Applications
- Astronomical and nuclear sciences
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Quantum, superfluid, helium dynamics
- Spacecraft and Cryogenic Technologies
- Advanced Data Storage Technologies
GSI Helmholtz Centre for Heavy Ion Research
2016-2025
Chiang Mai University
2024
University of Giessen
2007-2023
Max Planck Institute for Nuclear Physics
2004-2021
Technical University of Munich
2013-2019
Goethe University Frankfurt
2013
Columbia University
2009-2012
Max Planck Society
2004-2011
Weizmann Institute of Science
2010
Institute of Semiconductor Physics
2009
The energy-resolved rate coefficient for the dissociative recombination (DR) of $\mathrm{H}_{3}{}^{+}$ with slow electrons has been measured by storage-ring method using an ion beam produced from a radiofrequency multipole trap, employing buffer-gas cooling at 13 K. electron energy spread merged-beams measurement is reduced to $500\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$ cryogenic GaAs photocathode. This and previous cold-$\mathrm{H}_{3}{}^{+}$ jointly confirm capability storage rings,...
Term energies for dielectronic-recombination Rydberg resonances below 0.07 eV are determined Sc18+ with absolute accuracies 0.0002 by electron collision spectroscopy in an ion storage ring, using the twin-electron-beam technique and a cryogenic photocathode. The lithiumlike 2s_{1/2}-2p_{3/2} transition energy Z=21 is to 4.6 ppm, less than 1% of few-body effects on radiative corrections. Features from hyperfine structure 2s state could be resolved spectrum.
The hyperfine induced 2s 2p 3P0 > 2s2 1S0 transition rate AHFI in berylliumlike 47Ti18+ was measured. Resonant electron-ion recombination a heavy-ion storage ring employed to monitor the time dependent population of state. experimental value AHFI=0.56(3)/s is almost 60% larger than theoretically predicted.
Dielectronic recombination (DR) of xenonlike ${\mathrm{W}}^{20+}$ forming ${\mathrm{W}}^{19+}$ has been studied experimentally at a heavy-ion storage ring. A merged-beams method employed for obtaining absolute rate coefficients electron-ion in the collision-energy range 0--140 eV. The measured coefficient is dominated by strong DR resonances even lowest experimental energies. At plasma temperatures where fractional abundance expected to peak fusion plasma, derived over factor 4 larger than...
The periodic time modulations, found recently in the two-body orbital electron-capture (EC) decay of both, hydrogen-like $^{140}$Pr$^{58+}$ and $^{142}$Pm$^{60+}$ ions, with periods near to 7s amplitudes about 20%, were re-investigated for case by using a 245 MHz resonator cavity much improved sensitivity resolution. We observed that exponential EC is modulated period $T = 7.11(11)$s, accordance modulation 7.12(11)$ s as obtained from simultaneous observations capacitive pick-up, employed...
We report the first measurement of low-energy proton-capture cross sections $^{124}\mathrm{Xe}$ in a heavy-ion storage ring. ${^{124}\mathrm{Xe}}^{54+}$ ions five different beam energies between 5.5 and 8 AMeV were stored to collide with windowless hydrogen target. The $^{125}\mathrm{Cs}$ reaction products directly detected. interaction are located on high energy tail Gamow window for hot, explosive scenarios such as supernovae x-ray binaries. results serve an important test predicted...
The electron cooler of the CRYRING@ESR storage ring at GSI-FAIR accelerator complex is a unique instrument, which not only provides beam cooling stored ions, but also serves as low-energy target for Dielectronic Recombination experiments. minimisation vacuum contamination and response to rapid energy changes are key requirements in mode. Therefore, test bench was prepared study outgassing behaviour gun components setup constructed evaluate drift-electrode-modulation acceleration voltage...
We report the application of new elimination Rutherford elastic scattering technique for measurement proton-induced reaction cross sections utilizing stored ions decelerated to astrophysical energies. This approach results in a background reduction factor about 1 order magnitude, enabling first (p, n) section storage ring. Here, channels ^{124}Xe(p,n) and ^{124}Xe(p,γ) have been studied just above neutron threshold energy. The data provide valuable constraints Hauser-Feshbach theory...
Abstract Electron-ion collision spectroscopy at heavy-ion storage rings aims precision measurements of resonance features that occur in the cross sections electron processes such as electron-impact ionization ions or electron-ion recombination. As part international FAIR project low-energy ion ring CRYRING@ESR has been coupled with accelerators operated by GSI Helmholtz Center for Heavy-Ion Research Darmstadt, Germany. This opens up a new perspective testing strong field quantum...
A new determination of the decay rate negative ion positronium (Ps-), using a beam-foil method and stripping-based detection technique, is reported. The measured result gamma = 2.089(15) ns(-1) factor 6 more precise than previous experimental value 2.09(9) ns(-1), in excellent agreement with theoretical 2.086(6) ns(-1).
We have performed measurements of the dissociative electron recombination (DR) ${\mathrm{H}}_{3}^{+}$ at ion storage ring TSR utilizing a supersonic expansion source. The source has been characterized by continuous wave cavity ring-down spectroscopy. present high-resolution DR rate coefficients for different nuclear spin modifications combined with precise fragment imaging studies internal excitation ions inside ring. resolve changes in energy dependence between ortho-${\mathrm{H}}_{3}^{+}$...
The hyperfine-induced $2s\phantom{\rule{0.16em}{0ex}}2p\phantom{\rule{0.28em}{0ex}}{}^{3}\phantom{\rule{-0.16em}{0ex}}{P}_{0}\ensuremath{\rightarrow}2{s}^{2}\phantom{\rule{0.28em}{0ex}}{}^{1}\phantom{\rule{-0.16em}{0ex}}{S}_{0}$ transition rate in Be-like sulfur was measured by monitoring the decay of isotopically pure beams ${}^{32}$S${}^{12+}$ and ${}^{33}$S${}^{12+}$ ions a heavy-ion storage ring. Within 4$%$ experimental uncertainty value $0.096(4)$ s${}^{\ensuremath{-}1}$ agrees with...
We report ionization cross section measurements for electron impact single (EISI) of Fe^11+$ forming Fe^12+ and double (EIDI) Fe^11+ Fe^13+. The cover the center-of-mass energy range from approximately 230 eV to 2300 eV. experiment was performed using heavy ion storage ring TSR located at Max-Planck-Institut fur Kernphysik in Heidelberg, Germany. approach allows nearly all metastable levels relax ground state before data collection begins. find that is 30% smaller than previously measured a...
The utilization of the resonant atomic electron–ion collision process dielectronic recombination (DR) as a tool to probe nuclear properties via isotope shifts and hyperfine effects is discussed. Based on DR, this resonance reaction spectroscopy at electron coolers heavy-ion storage rings denotes versatile approach access parameters such charge radius, spin, magnetic moment or lifetimes long-lived excited states (isomers). high sensitivity DR allows for experiments with artificially...
The photoelectric effect has been studied in the regime of hard x rays and strong Coulomb fields via its time-reversed process radiative recombination (RR). In experiment, relativistic electrons recombined into 2p_{3/2} excited state hydrogenlike uranium ions, both RR subsequently emitted characteristic were detected coincidence. This allowed us to observe coherence between magnetic substates a highly charged ion identify contribution spin-orbit interaction process.
The low-energy CRYRING@ESR storage ring, recently commissioned at GSI@FAIR (Germany), is a world-unique facility able to decelerate and store beams produced in-flight energies E≤10 MeV/u. offers the unique opportunity exploit high quality, pure, radioactive of species difficult produce via ISOL method for reaction studies directly astrophysical interest. use thin, windowless in-ring targets combined with re-circulating beam also presents significant advantages in terms background luminosity....
We report electron impact ionization cross section measurements for single of Fe12 + forming Fe13 and double Fe14 +. These are the first data any Si-like ion uncontaminated by an unknown metastable fraction. Recent distorted wave calculations agree with our results to within ∼15%. Double is dominated inner shell a 2l resulting in autoionization second as hole filled.
The radiative electron capture of a target into the projectile continuum has been studied for collision system ${\text{U}}^{88+}+{\text{N}}_{2}\ensuremath{\rightarrow}{\text{U}}^{88+}+{[{\text{N}}_{2}^{+}]}^{*}+{e}^{\ensuremath{-}}+\ensuremath{\gamma}$ at 90 MeV/$\mathrm{u}$. Using magnetic spectrometer, energy distribution cusp electrons emitted under an angle ${0}^{\ensuremath{\circ}}$ with respect to beam and velocity close measured in coincidence photons various observation angles....
Recent spectroscopic models of active galactic nuclei (AGNs) have indicated that the recommended electron-ion recombination rate coefficients for iron ions with partially filled M shells are incorrect in temperature range where these form photoionized plasmas. We investigated this experimentally Fe XIV forming XIII. The coefficient was measured by employing merged-beams method at Heidelberg heavy-ion test storage ring. energy 0-260 eV encompasses all dielectronic 1s22s22p63l3l'3l'' nl'''...