V. N. Fedosseev
A5013828529- Nuclear physics research studies
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Particle Accelerators and Free-Electron Lasers
- Laser-Plasma Interactions and Diagnostics
- Mass Spectrometry Techniques and Applications
- Particle accelerators and beam dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Chemical Physics Studies
- Laser Design and Applications
- Particle Detector Development and Performance
- Laser-Matter Interactions and Applications
- Nuclear reactor physics and engineering
- Photocathodes and Microchannel Plates
- Radiation Therapy and Dosimetry
- Magnetic confinement fusion research
- Solid State Laser Technologies
- Quantum Chromodynamics and Particle Interactions
- Radioactive Decay and Measurement Techniques
- Advanced Fiber Laser Technologies
- Radiopharmaceutical Chemistry and Applications
- Ion-surface interactions and analysis
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
European Organization for Nuclear Research
2015-2024
University of Strathclyde
2022
Macquarie University
2021-2022
National Technical University of Athens
2022
Gobierno de Navarra
2022
Universidad de Navarra
2022
Campbell Collaboration
2020-2022
Google (United States)
2019
Max Planck Institute for Physics
2019
Max Planck Society
2019
High energy particle accelerators have been crucial in providing a deeper understanding of fundamental particles and the forces that govern their interactions. In order to increase or reduce size accelerator, new acceleration schemes need be developed. Plasma wakefield acceleration, which electrons plasma are excited, leading strong electric fields, is one such promising novel technique. Pioneering experiments shown an intense laser pulse electron bunch traversing plasma, drives fields 10s...
A very exotic process of $\ensuremath{\beta}$-delayed fission $^{180}\mathrm{Tl}$ is studied in detail by using resonant laser ionization with subsequent mass separation at ISOLDE (CERN). In contrast to common expectations, the fission-fragment distribution post-$\ensuremath{\beta}$-decay daughter nucleus $^{180}\mathrm{Hg}$ ($N/Z=1.25$) asymmetric. This asymmetry more surprising since a mass-symmetric split this extremely neutron-deficient would lead two $^{90}\mathrm{Zr}$ fragments, magic...
The Miniball germanium detector array has been operational at the REX (Radioactive ion beam EXperiment) post accelerator Isotope Separator On-Line facility ISOLDE CERN since 2001. During last decade, a series of successful Coulomb excitation and transfer reaction studies have performed with this array, utilizing unique high-quality radioactive beams which are available ISOLDE. In article, an overview is given technical details full setup, including description $\gamma$ -ray particle...
We report the first confirmation of predicted inversion between pi2p3/2 and pi1f5/2 nuclear states in nu(g)9/2 midshell. This was achieved at ISOLDE facility, by using a combination in-source laser spectroscopy collinear on ground 71,73,75Cu, which measured spin magnetic moments. The obtained values are mu(71Cu)=+2.2747(8)mu(N), mu(73Cu)=+1.7426(8)mu(N), mu(75Cu)=+1.0062(13)mu(N) corresponding to spins I=3/2 for 71,73Cu I=5/2 75Cu. results fair agreement with large-scale shell-model calculations.
At ISOLDE the majority of radioactive ion beams are produced using resonance ionization laser source (RILIS). This is based on resonant excitation atomic transitions by wavelength tunable radiation. Since its installation at facility in 1994, RILIS setup has been developed into a versatile remotely operated system comprising state-of–the-art solid state and dye lasers capable generating multiple high quality any range 210–950 nm. A continuous programme scheme development CERN other...
The radioactive element astatine exists only in trace amounts nature. Its properties can therefore be explored by study of the minute quantities artificially produced isotopes or performing theoretical calculations. One most important influencing chemical behaviour is energy required to remove one electron from valence shell, referred as ionization potential. Here we use laser spectroscopy probe optical spectrum near threshold. observed series Rydberg states enabled first determination...
The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment CERN the world׳s first experiment. AWAKE will be installed in former CNGS facility uses 400 GeV/c beam bunches from SPS. experiments focus on self-modulation instability of long (rms ~12 cm) bunch plasma. These are planned for end 2016. Later, 2017/2018, low energy (~15 MeV)...
Abstract One of the most important properties influencing chemical behavior an element is electron affinity (EA). Among remaining elements with unknown EA astatine, where one its isotopes, 211 At, remarkably well suited for targeted radionuclide therapy cancer. With At − anion being involved in many aspects current astatine labeling protocols, knowledge this prime importance. Here we report measured value to be 2.41578(7) eV. This result compared state-of-the-art relativistic quantum...
The mean-square charge radii of $^{207,208}\mathrm{Hg}$ ($Z=80$, $N=127$, 128) have been studied for the first time and those $^{202,203,206}\mathrm{Hg}$ ($N=122$, 123, 126) remeasured by application in-source resonance-ionization laser spectroscopy at ISOLDE (CERN). characteristic kink in $N=126$ neutron shell closure has revealed, providing information on its behavior below $Z=82$ proton closure. A theoretical analysis performed within relativistic Hartree-Bogoliubov nonrelativistic...
The applications of the laser resonance ionization method in nuclear research are reviewed.Investigation radioactive isotopes using techniques provides a valuable combination high selectivity, efficiency and spectral resolution.The majority ion beams produced at on-line isotope separator facilities profit from selectivity universal applicability sources.Numerous ultra-sensitive high-resolution spectroscopy based on atoms have been developed for study rare isotopes.A summary schemes applied...
The resonance ionization laser ion source (RILIS) produces beams for the majority of experiments at ISOLDE on-line isotope separator. A substantial improvement in RILIS performance has been achieved through a series upgrade steps: replacement copper vapor lasers by Nd:YAG laser; old homemade dye new commercial lasers; installation complementary Ti:Sapphire system. combined and system with harmonics is capable generating any wavelength range 210–950 nm. In total, isotopes 31 different...
We give direct experimental evidence for the observation of full transverse self-modulation a long, relativistic proton bunch propagating through dense plasma. The exits plasma with periodic density modulation resulting from radial wakefield effects. show that is seeded by ionization front created using an intense laser pulse copropagating bunch. extends over length following seed point. By varying one order magnitude, we frequency scales expected dependence on density, i.e., it equal to...
New technical developments have led to a 2 orders of magnitude improvement the resolution collinear resonance ionization spectroscopy (CRIS) experiment at ISOLDE, CERN, without sacrificing high efficiency CRIS technique. Experimental linewidths 20(1) MHz were obtained on radioactive beams francium, allowing us for first time determine electric quadrupole moment short lived [t_{1/2}=22.0(5) ms] ^{219}Fr Q_{s}=-1.21(2) eb, which would not been possible advantages offered by new method. This...
The seeded self-modulation of a relativistic, charged particle bunch in plasma is shown to grow both along the and plasma, resulting transverse wakefield amplitudes that far exceed initial seed values.
The neutron-deficient Hg isotopes have been a paradigm for nuclear shape coexistence. ground states of these nuclei exhibit striking structural differences from the neighboring Pb isotopes, and are very challenging to study experimentally. Here, new state-of-the-art data extend information on charge radii (and electromagnetic moments) lightest ever measured using laser spectroscopy. results suggest sudden decrease in deformation an end region ground-state staggering. These provide...
At the radioactive ion beam facility REX-ISOLDE, neutron-rich zinc isotopes were investigated using low-energy Coulomb excitation. These experiments have resulted in $B(E2,{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ values $^{74\ensuremath{-}80}\mathrm{Zn}$, $B(E2,{4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ $^{74,76}\mathrm{Zn}$ and determination of energy first excited ${2}_{1}^{+}$ states $^{78,80}\mathrm{Zn}$. The produced by high-energy proton- $(A=74,76,80)$ neutron- $(A=78)$...
Collective properties of the low-lying levels in odd-A Cu67–73 were investigated by Coulomb excitation with radioactive beams. The beams produced at ISOLDE and postaccelerated REX-ISOLDE up to 2.99 MeV/u. In Cu67,69, 1/2−, 5/2−, 7/2− states populated. Cu71,73, besides known transitions deexciting single-particle-like 5/2− core-coupled levels, γ rays 454 135 keV, respectively, observed for first time. Based on a reanalysis β-decay work comparison systematics, spin 1/2− is suggested these...
The Resonance Ionization Laser Ion Source (RILIS) is a powerful tool for efficient and selective production of radioactive ion beams at Isotope Separator On Line (ISOL) facilities. To avoid isobaric background, highly stepwise resonant ionization applied, using up to three different laser wavelengths. Due their advantages in terms stability reliability, an all solid-state titanium:sapphire (Ti:Sa) system used or planned be installed the majority on-line facilities worldwide. Such Ti:Sa going...
The magnetic moments and isotope shifts of the neutron-deficient francium isotopes (202-205)Fr were measured at ISOLDE-CERN with use collinear resonance ionization spectroscopy. A production-to-detection efficiency 1% was for (202)Fr. background from nonresonant collisional maintained below one ion in 10(5) beam particles. Through a comparison charge radii predictions spherical droplet model, it is concluded that ground-state wave function remains down to (205)Fr, departure observed (203)Fr (N=116).
Hyperfine splitting parameters have been measured for the neutron-deficient odd-mass polonium isotopes and isomers $^{193--203}\mathrm{Po}$${}^{g,m}$, $^{209,211}\mathrm{Po}$. The measurement was performed at ISOLDE (CERN) online mass separator using in-source resonance ionization spectroscopy technique. magnetic dipole moments $\ensuremath{\mu}$ spectroscopic electric quadrupole ${Q}_{S}$ deduced. Their implication understanding of nuclear structure in vicinity closed proton shell $Z=82$...
AWAKE is a proton-driven plasma wakefield acceleration experiment. % We show that the experimental setup briefly described here ready for systematic study of seeded self-modulation 400\,GeV proton bunch in 10\,m-long rubidium with density adjustable from 1 to 10$\times10^{14}$\,cm$^{-3}$. short laser pulse used ionization vapor propagates all way along column, suggesting full vapor. occurs bunch, at time and follows affects bunch.