A5107336182- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- Black Holes and Theoretical Physics
- Quantum chaos and dynamical systems
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Quantum Mechanics and Non-Hermitian Physics
- Muon and positron interactions and applications
- Spectral Theory in Mathematical Physics
- Nuclear reactor physics and engineering
- Pulsars and Gravitational Waves Research
- Crystallography and Radiation Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
Institut National de Physique Nucléaire et de Physique des Particules
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2020-2024
Université Paris-Saclay
2009-2024
Universität Greifswald
2022
Université Paris-Sud
2012-2020
Institut de Physique
2012-2020
RIKEN Nishina Center
2016
CEA Paris-Saclay
2009-2015
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2009-2015
We present results of lattice QCD simulations with mass-degenerate up and down mass-split strange charm (N f = 2 + 1 1) dynamical quarks using Wilson twisted mass fermions at maximal twist. The tuning the quark masses is performed two values spacing a ≈ 0:078 fm 0:086 sizes ranging from L 1:9 to 2:8 fm. measure high statistical precision light pseudoscalar m PS decay constant in range 270 ≲ 510 MeV determine low energy parameters 0 $ {\bar{l}_{3,4}} SU(2) chiral perturbation theory. use...
The Faddeev-Yakubovski equations are solved in configuration space for the $\ensuremath{\alpha}$-particle and $n\ensuremath{-}^{3}\mathrm{H}$ continuum states. We test ability of nonlocal nucleon-nucleon interaction models to describe $3N$ $4N$ systems.
We investigate the spatial structure of two-neutron wave function in Borromean nucleus $^{11}\mathrm{Li}$, using a three-body model $^{9}\mathrm{Li}+n+n$, which includes many-body correlations stemming from Pauli principle. The behavior neutron pair at different densities is simulated by calculating several distances between core $^{9}\mathrm{Li}$ and center mass two neutrons. With this representation, strong concentration on nuclear surface for first time quantitatively established...
We present results on the mass of nucleon and Delta using two dynamical degenerate twisted quarks tree-level Symanzik improved gauge action. The evaluation is performed at four quark masses corresponding to a pion in range about 300-600 MeV lattices 2.1-2.7 fm. check for cut-off effects by evaluating these baryon spatial size 2.1 fm beta=3.9 beta=4.05 lattice 2.4 beta=3.8. values we find are compatible within our statistical errors. Lattice extrapolated physical limit continuum chiral...
We present results on the nucleon axial form factors within lattice QCD using two flavors of degenerate twisted mass fermions. Volume effects are examined simulations at volumes spatial length $L=2.1$ fm and $L=2.8$ fm. Cut-off investigated three different values spacings, namely $a=0.089$ fm, $a=0.070$ $a=0.056$ The charge is obtained in continuum limit chirally extrapolated to physical pion enabling comparison with experiment.
The masses of the low-lying baryons are evaluated using two degenerate flavors twisted mass sea quarks corresponding to pseudoscalar in range about 270--500 MeV. strange valence quark is tuned reproduce kaon physical limit. tree-level Symanzik improved gauge action employed. We use lattices spatial size 2.1 and 2.7 fm at values lattice spacing with ${r}_{0}/a=5.22(2)$ ${r}_{0}/a=6.61(3)$. check for both finite volume cutoff effects on baryon masses. performed a detailed study chiral...
We consider the theoretical possibility to generate a narrow resonance in four neutron system as suggested by recent experimental result. To that end, phenomenological $T=3/2$ three force is introduced, addition realistic $NN$ interaction. inquire what should be strength of $3n$ order such resonance. The reliability three-neutron channel exmined, analyzing its consistency with low-lying $T=1$ states $^4$H, $^4$He and $^4$Li $^3{\rm H} + n$ scattering. {\it ab initio} solution $4n$...
We present results on the nucleon electromagnetic form factors within lattice QCD using two flavors of degenerate twisted mass fermions. Volume effects are examined simulations at volumes spatial length $L=2.1\text{ }\text{ }\mathrm{fm}$ and $L=2.8\text{ }\mathrm{fm}$. Cutoff investigated three different values spacings, namely $a=0.089\text{ }\mathrm{fm}$, $a=0.070\text{ $a=0.056\text{ The magnetic moment, Dirac Pauli radii obtained in continuum limit chirally extrapolated to physical pion...
We present results on the lower moments of nucleon generalized parton distributions within lattice QCD using two dynamical flavors degenerate twisted mass fermions. Our simulations are performed lattices with three different values spacings, namely, $a=0.089\text{ }\text{ }\mathrm{fm}$, $a=0.070\text{ and $a=0.056\text{ allowing investigation cutoff effects. The volume dependence is examined spatial length $L=2.1\text{ }\mathrm{fm}$ $L=2.8\text{ }\mathrm{fm}$. span pion masses in range 260...
We investigate a reaction model that describes fast removal of the α particle from ^{8}He nucleus with eventual emission four neutrons. The obtained neutron energy distribution allows one to explain sharp low peak observed by studying missing mass spectra neutrons in Duer et al. [Nature (London) 606, 678 (2022)NATUAS0028-083610.1038/s41586-022-04827-6], as consequence dineutron-dineutron correlations. phenomenon emergence low-energy four-neutron should be more general and is expected decay...
The $n$-${}^{3}$H and $p$-${}^{3}$He elastic phase shifts below the trinucleon disintegration thresholds are calculated by solving four-nucleon problem with three different realistic nucleon-nucleon interactions (the I-N3LO model Entem Machleidt, Argonne ${v}_{18}$ potential model, a low-$k$ derived from CD-Bonn potential). Three methods---Alt-Grassberger-Sandhas, hyperspherical harmonics, Faddeev-Yakubovsky---have been used their respective results compared. For both we observe rather good...
We present results of lattice QCD simulations with mass-degenerate up and down mass-split strange charm (Nf=2+1+1) dynamical quarks using Wilson twisted mass fermions at maximal twist. The tuning the quark masses is performed three values spacing a~0.06 fm, a~0.08 fm a~0.09 sizes ranging from L~1.9 to L~3.9 fm. perform a preliminary study SU(2) chiral perturbation theory by combining our data these spacing.
We explore the description of bound $^{19}$B isotope in terms a $^{17}$B+n+n three-body system where two-body subsystems $^{17}$B+n and neutron-neutron (nn) have virtual states close to continuum. Dimensionless scaling functions for root-mean-square (rms) radii are defined studied different parameters neutron-core potential considering three models interaction. The rooted on universal behavior systems Efimov limit depend only dimensionless quantities formed by two-neutron separation energies...
The three-dimensional trajectories of a neutron in an average deformed potential are studied for two different potentials with prolate or oblate ellipsoidal deformations. simplest one is simple cavity which shown to be integrable. motion and found separable spheroidal coordinates. It that the phase space may contain separatrix associated crossing focal circle while does only planar trajectories. By using arguments based on uniform semiclassical approximation, it quantum-energy-level spectra...
Low energy $n\text{\ensuremath{-}}^{3}\mathrm{H}$ elastic cross sections near the resonance peak are calculated by solving four-nucleon problem with realistic NN interactions. Three different methods---Alt, Grassberger, and Shandas; hyperspherical harmonics; Faddeev-Yakubovsky---have been used their respective results compared. We conclude on a failure of existing forces to reproduce total section.
The masses of the low-lying strange and charm baryons are evaluated using two degenerate flavors twisted mass sea quarks for pion in range about 260 to 450 MeV. valence quark tuned reproduce kaon $D$ meson at physical point. tree-level Symanzik improved gauge action is employed. We use three values lattice spacing, corresponding $\ensuremath{\beta}=3.9$, $\ensuremath{\beta}=4.05$ $\ensuremath{\beta}=4.2$, with ${r}_{0}/a=5.22(2)$, ${r}_{0}/a=6.61(3)$ ${r}_{0}/a=8.31(5)$, respectively....
It is a well-established fact that intranuclear-cascade models generally fail to consistently reproduce the cross sections for one-proton and one-neutron removal from stable nuclei by high-energy proton beam. We use simple shell-model calculations investigate reasons of this deficiency. find refined description neutron skin energy density in nuclear surface crucial aforementioned observables, neither ingredient sufficient if taken separately. As by-product, predictions several nucleons are...
We analyze the power counting of peripheral singlet partial waves in nucleon-nucleon scattering. In agreement with conventional wisdom, we find that pion exchanges are perturbative singlets. quantify from effective field theory perspective well-known suppression induced by centrifugal barrier pion-exchange interactions. By exploring perturbation up to fourth order, one-pion-exchange potential these channels is demoted leading subleading order a given expansion parameter grows orbital angular...