Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Gilleron, Franck"'
We present new sum rules for $3jm$ coefficients, which involve, in addition to the usual weighting factor $(2j + 1)$ where $j$ is an angular momentum, the quantity $[j(j + 1)]^k$ with $k \ge 1$. The sum rules appear for instance in the statistical mo
Externí odkaz:
http://arxiv.org/abs/2102.06133
Partition functions of a canonical ensemble of non-interacting bound electrons are a key ingredient of the super-transition-array approach to the computation of radiative opacity. A few years ago, we published a robust and stable recursion relation f
Externí odkaz:
http://arxiv.org/abs/2009.13518
The expression of the electron broadening operator including the effect of penetrating collisions, i.e. for which the incoming electron enters the extent of bound-electron wavefunctions, is rather complicated, even for hydrogen. It involves integrals
Externí odkaz:
http://arxiv.org/abs/2001.02886
Laboratory (laser and Z-pinch) opacity measurements of well-characterized plasmas provide data to assist inertial confinement fusion, astrophysics and atomic-physics research. In order to test the atomic-physics codes devoted to the calculation of ra
Externí odkaz:
http://arxiv.org/abs/2001.03559
Spectral lines emitted by plasmas provide information about the thermodynamic conditions, the degree of randomness or the interactions prevailing in the medium. Collisions by plasma electrons penetrating the extent of bound-electron wavefunctions is
Externí odkaz:
http://arxiv.org/abs/1901.08494
Opacity is a key ingredient of stellar structure and evolution. In the present work, we recall the role of opacity in asteroseismology, focusing mainly on two kinds of astrophysical objects: $\beta$ Cephei-type stars, and the Sun. The detailed opacit
Externí odkaz:
http://arxiv.org/abs/1901.08959
Publikováno v:
Astronomical Society of the Pacific Conference Series, Workshop on Astrophysical Opacities, C. Mendoza, S. Turck-Chi\`eze, and J. Colgan, eds., Vol. 515, pp. 35-45 (2018)
Radiative opacity is an important quantity in the modeling of stellar structure and evolution. In the present work we recall the role of opacity in the interpretation of pulsations of different kinds of stars. The detailed opacity code SCO-RCG for lo
Externí odkaz:
http://arxiv.org/abs/1802.00782
We present a project dedicated to hot plasma spectroscopy based on a Multi-Configuration Dirac-Fock (MCDF) code, initially developed by J. Bruneau. The code is briefly described and the use of the transition-state method for plasma spectroscopy is de
Externí odkaz:
http://arxiv.org/abs/1710.06225
Nowadays, several opacity codes are able to provide data for stellar structure models, but the computed opacities may show significant differences. In this work, we present state-of-the-art precise spectral opacity calculations, illustrated by stella
Externí odkaz:
http://arxiv.org/abs/1706.01761
The broadening of lines by Stark effect is widely used for inferring electron density and temperature in plasmas. Stark-effect calculations often rely on atomic data (transition rates, energy levels,...) not always exhaustive and/or valid only for is
Externí odkaz:
http://arxiv.org/abs/1608.01382