M. Trassinelli
A5030762368- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear physics research studies
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Ion-surface interactions and analysis
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Laser-induced spectroscopy and plasma
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Scientific Measurement and Uncertainty Evaluation
- Muon and positron interactions and applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced Frequency and Time Standards
- Particle accelerators and beam dynamics
- Magnetic and transport properties of perovskites and related materials
- Astro and Planetary Science
- Astronomical and nuclear sciences
- Crystallography and Radiation Phenomena
- Particle physics theoretical and experimental studies
- Quantum Mechanics and Applications
- nanoparticles nucleation surface interactions
- Quantum Information and Cryptography
- Laser-Ablation Synthesis of Nanoparticles
Sorbonne Université
2016-2025
Institut des NanoSciences de Paris
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Institut National de Santé Publique
2020
Technical University of Munich
2013-2019
GSI Helmholtz Centre for Heavy Ion Research
2006-2017
Université Paris Cité
2015
Institut de Mathématiques de Jussieu-Paris Rive Gauche
2008-2015
Laboratoire Kastler Brossel
2004-2014
Heidelberg University
2009-2010
We report on time-modulated two-body weak decays observed in the orbital electron capture of hydrogen-like 140Pr59+ and 142Pm60+ ions coasting an ion storage ring. Using non-destructive single ion, time-resolved Schottky mass spectrometry we found that expected exponential decay is modulated time with a modulation period about 7 seconds for both systems. Tentatively this observation attributed to coherent superposition finite eigenstates neutrinos from into final state.
Abstract Quantum electrodynamics (QED), the quantum field theory that describes interaction between light and matter, is commonly regarded as best-tested in modern physics. However, this claim mostly based on extremely precise studies performed domain of relatively low strengths atoms ions 1–6 . In realm very strong electromagnetic fields such heaviest highly charged (with nuclear charge Z ≫ 1), QED calculations enter a qualitatively different, non-perturbative regime. Yet, corresponding...
We report on the first measurement of ${\ensuremath{\beta}}^{+}$ and orbital electron-capture decay rates $^{140}\mathrm{Pr}$ nuclei with simplest electron configurations: bare nuclei, hydrogenlike, heliumlike ions. The measured constant hydrogenlike $^{140}\mathrm{Pr}^{58+}$ ions is about 50% larger than that $^{140}\mathrm{Pr}^{57+}$ Moreover, one bound faster neutral $^{140}\mathrm{Pr}^{0+}$ atoms 59 electrons. To explain this peculiar observation has to take into account conservation...
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...
The $5g-4f$ transitions in pionic nitrogen and muonic oxygen were measured simultaneously by using a gaseous nitrogen-oxygen mixture at 1.4\,bar. Due to the precise knowledge of muon mass line provides energy calibration for transition. A value (139.57077\,$\pm$\,0.00018)\,MeV/c$^{2}$ ($\pm$\,1.3ppm) is derived negatively charged pion, which 4.2ppm larger than present world average.
The surface chemistry of gold nanoparticles produced by the pulsed laser ablation in liquids method is investigated X-ray photoelectron spectroscopy (XPS). presence oxide expected on these systems using synchrotron radiation conditions close to their original state solvent but free from substrate or effects which could affect interpretation spectroscopic observations. For that purpose we performed experiment a controlled free-standing nanoparticle beam combination an atomizer and aerodynamic...
The K shell excitation of H-like uranium (U(91+)) in relativistic collisions with different gaseous targets has been studied at the experimental storage ring GSI Darmstadt. By performing measurements as well collision energies, we were able to observe for first time effect electron-impact (EIE) process heaviest hydrogenlike ion. large fine-structure splitting allowed us unambiguously resolve into L levels. State-of-the-art calculations performed within framework which include mechanisms due...
Knowledge of the detailed evolution whole charge-state distribution projectile ions colliding with targets is required in several fields research such as material science and atomic nuclear physics but also accelerator physics, particular regard to foreseen large-scale facilities. However, there a lack data for collisions nonperturbative energy domain that involve many-electron projectiles. Starting from etacha model we developed [Rozet et al., Nucl. Instrum. Methods Phys. Res., Sect. B 107,...
Abstract The hadronic width of the ground state pionic hydrogen has been redetermined by X-ray spectroscopy to be $$\varGamma ^{\pi \mathrm {H}}_{1s}=(856\,\pm \,16_\mathrm{stat}\,\pm \,22_\mathrm{sys})$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msubsup> <mml:mi>Γ</mml:mi> <mml:mn>1</mml:mn> <mml:mi>s</mml:mi> </mml:mrow> <mml:mi>π</mml:mi> <mml:mi>H</mml:mi> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mo>(</mml:mo> <mml:mn>856</mml:mn> <mml:mspace />...
Pulsed laser ablation in liquid (PLAL) is a powerful method for producing nanoparticle colloids with long-term stability despite the absence of stabilizing organic agents. The colloid involves different reactivities and chemical equilibria complex ionic-specific effects at nanoparticle/solvent interface which must be strongly influenced by their composition. In this work, surface composition PLAL-produced gold nanoparticles alkaline saline (NaBr) water investigated X-ray photoelectron...
Detailed comparisons between theory and experiment for quantum electrodynamics (QED) effects in He-like ions have been performed the literature to search hints of new physics. Different frequentist statistical analyses existing atomic transition energy data shown contradictory conclusions as presence possible deviations from predictions. We present here an approach using Bayesian statistics which allows assign quantitative probabilities different deviation models $Z = 5$ 92. Potential beyond...
In gold nanoparticle colloids produced by the pulsed laser ablation in liquid method, surface oxidation can be controlled adjusting bromide coverage when synthesized halide saline solutions.
The β+ and orbital electron-capture decays of stored hydrogen- helium-like 142Pm ions have been measured. So far, such measurements performed with only one nucleus, namely 140Pr. decay constant hydrogen-like 142Pm60+ is about 50% larger than that 142Pm59+ ions, which in excellent agreement the previous 140Pr new theoretical predictions.
We have performed a systematic study of the Bremsstrahlung emission from electrons in plasma commercial 14.5 GHz Electron-Cyclotron Resonance Ion Source. The electronic spectral temperature and product ionic densities are measured by analyzing spectra recorded for several rare gases (Ar, Kr, Xe) as function injected power. Within our uncertainty, we find an average ? 48 keV above 100W, with weak dependency on power gas composition. Charge state distributions extracted ion beams been...
The spectral distribution of the 1s2s {1}S{0}-->1s{2} 1S0 two-photon decay He-like tin was measured using a novel approach at gas-jet target ESR storage ring. Relativistic collisions Li-like projectiles with low-density gaseous matter have been exploited to selectively populate desired state. Compared conventional techniques, this results in substantial gain statistical and systematic accuracy, which allowed us achieve for first time sensitivity relativistic effects on shape as well...
The half-lives of fully ionized and hydrogen-like (H-like) 122I ions have been measured in a heavy-ion storage ring. $ \beta^{+}_{}$ -decay constants for both charge states the electron capture (EC) decay constant H-like determined. EC-decay $\ensuremath \lambda^{\text{H-like}}_{\rm EC}=7.35(33)\cdot10^{-4}{\,\mbox{s}}^{-1}$ is, within uncertainty, same as one neutral atoms. This result is agreement with estimates recent theoretical considerations on few-electron that explicitly take into...
We present the investigation on modifications of structural and magnetic properties MnAs thin film epitaxially grown GaAs induced by slow highly charged ions bombardment under well-controlled conditions. The ion-induced defects facilitate nucleation one phase with respect to other in first-order magneto-structural transition a consequent suppression thermal hysteresis without any significant perturbation properties. In particular, irradiated keeps giant magnetocaloric effect at room...
We present the first observation of 1s2p 3P2→1s2s 3S1 transition in He-like uranium. The experiment was performed at internal gas-jet target ESR storage ring GSI exploiting a Bragg crystal spectrometer and germanium solid-state detector. Using 1s22p 2P3/2→1s22s 2S1/2 Li-like uranium as reference deceleration capabilities ring, we obtained evaluation energy an intra-shell for heavy ion.
The chemical and geometrical structure of free-standing carbon dots (Cdots) prepared from the pyrolysis N-hydroxysuccinimide (NHS) have been characterized using X-ray photoelectron spectroscopy (XPS). An aerodynamic lens system was used to generate a sufficient particle density monodispersed Cdots for XPS studies at PLEIADES beamline SOLEIL synchrotron facility. Varying excitation energy between 315 755 eV allows probing surface toward their core, owing kinetic dependence inelastic mean free...
The experimental investigation of quantum-electrodydamic contributions to the binding energies inner shells highly charged heavy ions requires an accurate spectroscopy in region hard x-rays suitable at a limited source strength. For this purpose focusing compensated asymmetric Laue crystal optics has been developed and twin-spectrometer assembly built commissioned storage ring GSI Helmholtzzentrum Darmstadt. We characterize demonstrate usefulness instrumentation for both stationary fast...