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Oxygen Opacity Measurements at High-Energy-Density Conditions
J E Bailey1, D C Mayes2, G P Loisel1
1Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
Abstract:
We present the first benchmark measurements of oxygen opacity at high-energy-density, crucial for understanding stellar interiors. A 3-5-μm thick SiO_{2} sample was heated using a Z facility x-ray source, and opacity was measured in the 5-19.5 Å range with multiple spectrometers. The electron temperature and density inferred from Si K-shell spectra were 148±4 eV and 8.6±1.4× 10^{21} cm^{-3}, respectively. Six experiments showed opacity reproducibility within ±15% and 5%-25% opacity uncertainty. Measured oxygen opacity and seven different opacity models exhibit extraordinary overall agreement. Discrepancies near the H-like photon ionization threshold and in certain spectral lines suggest the need for model refinements.
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