A5075865024- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Advanced NMR Techniques and Applications
- Quantum, superfluid, helium dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Particle physics theoretical and experimental studies
- Astro and Planetary Science
- Nuclear reactor physics and engineering
- Scientific Research and Discoveries
- Atomic and Subatomic Physics Research
- Inorganic Fluorides and Related Compounds
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Neutrino Physics Research
- Superconducting Materials and Applications
- Radiopharmaceutical Chemistry and Applications
- High-pressure geophysics and materials
- Radiation Therapy and Dosimetry
- Cold Atom Physics and Bose-Einstein Condensates
Université Libre de Bruxelles
2015-2024
Kyoto University
2019
RIKEN Nishina Center
2016
Université Paris-Sud
2012-2015
Institut National de Physique Nucléaire et de Physique des Particules
2012-2015
Centre National de la Recherche Scientifique
2009-2015
Université Paris-Saclay
2015
Campus France
2012-2015
University of North Carolina at Chapel Hill
2015
Universidade de São Paulo
2013-2014
We improve standard big bang nucleosynthesis (SBBN) calculations by taking into account new nuclear physics analyses (the 2003 work of Descouvemont and coworkers). Using a Monte Carlo technique, we calculate the abundances light nuclei (D, 3He, 4He, 7Li) versus baryon-to-photon ratio. The results concerning Ωbh2 are compared with relevant astrophysical cosmological observations: abundance determinations in primitive media from cosmic microwave background (CMB) experiments, especially...
We report on a new measurement of the 14N(p,γ)15O capture cross section at Ep=140 to 400 keV using kV LUNA accelerator facility Laboratori Nazionali del Gran Sasso (LNGS). The uncertainties have been reduced with respect previous measurements and their analysis. analyzed data R-matrix method we find that ground state transition accounts for about 15% total S-factor. main contribution S-factor is given by 6.79 MeV state. S(0)=1.7±0.2 b, in agreement recent extrapolations. result has important...
The different facets of the $R$-matrix method are presented pedagogically in a general framework. Two variants have been developed over years: $(i)$ "calculable" is calculational tool to derive scattering properties from Schr\"odinger equation large variety physical problems. It was rather independently atomic and nuclear physics with too little mutual influence. $(ii)$ "phenomenological" technique parametrize various types cross sections. mainly (or uniquely) used physics. Both directions...
Primordial or big bang nucleosynthesis (BBN) is one of the three historically strong evidences for model. Standard BBN now a parameter-free theory, since baryonic density Universe has been deduced with an unprecedented precision from observations anisotropies cosmic microwave background radiation. There good agreement between primordial abundances $^{4}\mathrm{He}$, D, $^{3}\mathrm{He}$, and $^{7}\mathrm{Li}$ calculations. However, calculated abundance significantly higher than spectroscopic...
The generator-coordinate method is applied to the study of three-\ensuremath{\alpha}-particle system. choice basis functions allows us calculate \ensuremath{\alpha}${+\mathrm{}}^{8}$Be phase shifts. We perform a comparison between full three-cluster approach and two its approximations. Distortion effects are shown be important in spectroscopic properties $^{12}\mathrm{C}$. present $^{8}\mathrm{Be}$(\ensuremath{\alpha},\ensuremath{\gamma}${)\mathrm{}}^{12}$C S factor derived model. At low...
We apply the Lagrange-mesh technique to three-body systems defined in hyperspherical coordinates. The method is applied ${}^{6}\mathrm{He}$ (described as $\ensuremath{\alpha}+n+n)$ and ${}^{12}\mathrm{C}$ $\ensuremath{\alpha}+\ensuremath{\alpha}+\ensuremath{\alpha}),$ shown be fast accurate. To deal with two-body forbidden states, we compare usual projection use of supersymmetric equivalent potentials. Both approaches provide similar spectroscopic properties, although wave functions can...
The ${}^{12}$C($\ensuremath{\alpha}$,$\ensuremath{\gamma}$)${}^{16}$O reaction plays a crucial role in stellar evolution. rate of this determines directly the ${}^{12}$C-to-${}^{16}$O abundance ratio at end helium burning phase stars and consequently has big effect on subsequent nucleosynthesis even evolution massive stars. However, despite many experimental studies, low-energy cross section remains uncertain. extrapolation measured sections to energies ($E\ensuremath{\sim}300$ keV) is made...
A previous microscopic three-cluster calculation, applied to the $^{7}\mathrm{Be}(p,\ensuremath{\gamma})^{8}\mathrm{B}$ reaction, is updated in several ways: $^{7}\mathrm{Be}$ description improved, two nucleon-nucleon interactions are considered, and new experimental information about scattering lengths taken into account. Weak changes energy dependence of $S$ factor obtained. ``theoretical'' uncertainty estimated. It amounts 5% near $1\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ but reaches...
Resonance structures of excited states in ${}^{9}\mathrm{Be}$ and ${}^{9}\mathrm{B}$ are studied by means a microscopic multicluster model. The two-body scattering ${{}^{8}\mathrm{Be}{(0}^{+}{,2}^{+}{,4}^{+})+N;$ ${}^{5}\mathrm{He}$ or ${}^{5}\mathrm{Li}{(3/2}^{\ensuremath{-}}{,1/2}^{\ensuremath{-}})+\ensuremath{\alpha}}$ is solved the R-matrix method where two-cluster wave functions ${}^{8}\mathrm{Be}$ employed. These results compared with $\ensuremath{\alpha}+\ensuremath{\alpha}+N$...
Antisymmetric \ensuremath{\alpha}+${}^{14}$${\mathrm{C}}_{\mathrm{g}.\mathrm{s}.}$ and \ensuremath{\alpha}${+\mathrm{}}^{14}$C${(2}_{1}^{+}$) wave functions are used in the generator coordinate formalism to investigate molecular properties of $^{18}\mathrm{O}$ states. Quadrupole moments, rms radii, reduced \ensuremath{\alpha} widths these states calculated as well E1 E2 transition probabilities between them. A number bands found analyzed. The assignment experimental is discussed....
The elastic breakup of a three-body projectile on target is studied within the eikonal approximation with full account final-state interactions. Bound and scattering states are calculated in hyperspherical coordinates Lagrange mesh. A correction introduced to avoid divergence cross sections due Coulomb interaction. allows direct calculation various sections, particular multidifferential can be obtained. model applied $^{6}\mathrm{He}$ $^{208}\mathrm{Pb}$. halo nucleus described...
The (2)H(d,p)(3)H, (2)H(d,n)(3)He, and (2)H(d,γ)(4)He reactions are studied at low energies in a multichannel ab initio model that takes into account the distortions of nuclei. internal wave functions these nuclei given by stochastic variational method with AV8' realistic interaction phenomenological three-body force included to reproduce two-body thresholds. obtained astrophysical S factors all very good agreement experiment. most important channels for both transfer radiative capture...
We investigate the effect of a variation fundamental constants on primordial element production in big bang nucleosynthesis (BBN). focus possible change nucleon-nucleon interaction nuclear reaction rates involving $A=5$ ($^{5}\mathrm{Li}$ and $^{5}\mathrm{He}$) $A=8$ ($^{8}\mathrm{Be}$) unstable nuclei. The for $^{3}\mathrm{He}(\mathrm{d},\mathrm{p})^{4}\mathrm{He}$ $^{3}\mathrm{H}(\mathrm{d},\mathrm{n})^{4}\mathrm{He}$ are dominated by properties broad analog resonances $^{5}\mathrm{He}$...