S. Platchkov
A5020591260- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Particle Detector Development and Performance
- Atomic and Molecular Physics
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
- Muon and positron interactions and applications
- Particle Accelerators and Free-Electron Lasers
- Rare-earth and actinide compounds
- Advanced Frequency and Time Standards
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Radioactive Decay and Measurement Techniques
- Magnetic Properties of Alloys
- Geomagnetism and Paleomagnetism Studies
- Magnetic confinement fusion research
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2011-2024
CEA Paris-Saclay
2011-2024
Université Paris-Saclay
1998-2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2011-2024
University of Aveiro
2017-2023
A. Alikhanyan National Laboratory
2023
Institute of Physics, Academia Sinica
2020
University of Turin
2015-2018
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
1997-2017
Institut de Physique
2012-2014
The $3s$ radial wave function $R(\mathcal{r})$ has been determined by electron scattering from $^{206}\mathrm{Pb}$ and $^{205}\mathrm{Tl}$. shape of in the central region nucleus is used to test validity independent-particle shell model at large nuclear density.
We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering polarised muons on protons deuterons in the range 0.003<x<0.7 Q2>1 GeV2. Compared to our previous publication this subject, with new data statistical errors have been reduced by nearly factor two. From these inclusive we determine quark distributions valence quarks non-strange sea at Q2=10 The u distribution, Δuv(x), is positive polarisation increases x. d...
We have measured the deuteron magnetic form factor $B({q}^{2})$ for values of momentum transfer squared between 7 and 28 ${\mathrm{fm}}^{\ensuremath{-}2}$. The data are compared with relativistic nonrelativistic predictions including meson-exchange-current contributions. Significant disagreement is found large transfers.
We have measured the charge and magnetic form factors of tritium for values momentum transfer up to 31.3 ${\mathrm{fm}}^{\ensuremath{-}2}$. The data are compared with calculations three-body system including meson-exchange-current contributions.
We present a next-to-leading order QCD analysis of the presently available data on spin structure function g1 including final from Spin Muon Collaboration. results for first moments proton, deuteron, and neutron functions, determine singlet nonsinglet parton distributions in two factorization schemes. also test Bjorken sum rule find agreement with theoretical prediction at level 10%.Received 18 May 1998DOI:https://doi.org/10.1103/PhysRevD.58.112002©1998 American Physical Society
We present a measurement of the longitudinal spin cross section asymmetry for deep-inelastic muon-nucleon interactions with two high transverse momentum hadrons in final state. Two methods event classification are used to increase contribution photon-gluon fusion process above 30%. The most effective one, based on neural network approach, provides asymmetries Al→NlhhXp=0.030±0.057(stat)±0.010(syst) and Al→NlhhXd=0.070±0.076(stat)±0.010(syst). From these values we derive an averaged gluon...
The elastic magnetic form factor of $^{3}\mathrm{He}$ has been measured up to ${q}^{2}=32$ ${\mathrm{fm}}^{\ensuremath{-}2}$. Fewbody theory fails explain the location diffraction minimum unless nonnucleonic degrees freedom are explicitly introduced.
Deuteron electrodisintegration at threshold has been measured between ${Q}^{2}=7 \mathrm{and} 28$ ${\mathrm{fm}}^{\ensuremath{-}2}$. Nonnucleonic degrees of freedom are essential for the interpretation data. In particular, beyond 20 ${\mathrm{fm}}^{\ensuremath{-}2}$ data provide evidence processes conventional one-pion exchange.
The fundamental theory of the strong interaction-quantum chromodynamics (QCD)—provides foundational framework with which to describe and understand key properties atomic nuclei. A deep understanding explicit role quarks gluons in nuclei remains elusive however, as these effects have thus far been well-disguised by confinement QCD are encapsulated a successful description terms effective hadronic degrees freedom. observation EMC effect has provided an enduring indication for nuclei, points...
Cross sections have been measured for elastic electron scattering from the magnetization distributions of $^{49}\mathrm{Ti}$, $^{51}\mathrm{V}$, $^{59}\mathrm{Co}$, $^{87}\mathrm{Sr}$, $^{93}\mathrm{Nb}$, and $^{208}\mathrm{Bi}$. Particular emphasis has placed on multipole distribution highest order possible, which dominates magnetic form factor at momentum transfer values $q$ between 1.7 3.0 ${\mathrm{fm}}^{\ensuremath{-}1}$. The data $1{f}_{\frac{7}{2}}$ shell nuclei $^{51}\mathrm{V}$...
The transition charge density for the octupole vibration of $^{208}\mathrm{Pb}$ has been determined with an unprecedented accuracy inelastic transition. A comparison some best theoretical calculations shows a persistent discrepancy in interior nucleus which offers measure limitations various approaches considered.
The gluon distributions of the pion obtained from various global fits exhibit large variations among them. Within framework color evaporation model, we show that existing pion-induced $J/\ensuremath{\psi}$ production data, usually not included in fits, can impose useful additional constraints on parton distribution functions (PDFs). In particular, these data probe pion's densities at $x$. Existing covering a broad range beam momenta are compared with next-to-leading-order QCD calculations...
A front-end BiCMOS ASIC was specially developed for the Micromegas detectors to be used in Small Angle Tracker of COMPASS experiment at CERN. Each 16 channels this integrated circuit contains a low noise preamplifier with 100 ns peaking time filter and discriminator driving low-level differential digital buffer. The design choice shaping have been tuned detector signal shape order allow operation even very multiplication gain values. Noise measurements show an equivalent charge less than...
Elastic and inelastic electron scattering cross sections are given for $^{50,52,54}\mathrm{Cr}$ at momentum transfers between 0.15 2.6 ${\mathrm{fm}}^{\ensuremath{-}1}$. Ground state charge distributions derived from a combined analysis of these data muonic atom data. Deduced values the rms radii given. Comparison is made experimental density dependent Hartree-Fock-Bogolyubov calculations. Inelastic form factors ${2}^{+}$, ${4}^{+}$, ${6}^{+}$ states up to 4 MeV excitation along with shell...
The physics program in Hall A at Jefferson Lab commenced the summer of 1997 with a detailed investigation $^{16}\mathrm{O}(e,{e}^{\ensuremath{'}}p)$ reaction quasielastic, constant $(q,\ensuremath{\omega})$ kinematics ${Q}^{2}\ensuremath{\approx}0.8\phantom{\rule{0.3em}{0ex}}{(\mathrm{GeV}∕c)}^{2}$, $q\ensuremath{\approx}1\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}∕c$, and $\ensuremath{\omega}\ensuremath{\approx}445\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$. Use self-calibrating, self-normalizing,...