Speaker
James Bailey
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/I2.006.pdf
Opacity data for stellar models and its uncertainties
J.E. Bailey1, T. Nagayama1, G.P. Loisel1, G.A. Rochau1, C. Blancard2, J. Colgan3, Ph. Cosse2,
G. Faussurier2, C.J. Fontes3, F. Gilleron2, I. Golovkin4, S.B. Hansen1, G. Hazak5, C.A.
Iglesias6, D.P. Kilcrease3, Y. Kurzweil5, J.J. MacFarlane4, R.C. Mancini7, R.M. More8, S.N.
Nahar9, C. Orban9, J.-C. Pain2, A.K. Pradhan9, M. Sherrill3, and B.G. Wilson6
1 Sandia National Laboratories, Albuquerque, New Mexico
2 CEA, DAM, DIF, F-91297 Arpajon, France
3 Los Alamos National Laboratory, Los Alamos, New Mexico
4 Prism Computational Sciences, Madison, Wisconsin
5 Nuclear Research Center Negev, Israel
6 Lawrence Livermore National Laboratory, Livermore, California
7 University of Nevada, Reno, Nevada
8 RMorePhysics, Pleasanton, California
9 Ohio State University, Columbus, Ohio
Laboratory experiments have found iron opacity predictions are notably different from
measurements performed at conditions similar to the boundary between the solar radiation
and convection zones [Bailey et al., Nature (2015)]. The measurements help resolve
discrepancies between helioseismology and solar models. However, it is essential to
understand the differences between opacity predictions and measurements. New
measurements with chromium, iron, and nickel are providing a systematic study of how
opacity changes with temperature, density, and atomic number. Additional experiments are
underway to extend the accessible temperature and density range and to measure the time-
resolved temperature and density evolution. These experiments help further evaluate
experiment error possibilities and constrain hypotheses for opacity model refinements.
++ Sandia National Laboratories is a multimission laboratory managed and operated by National Technology
and Engineering Solutions of Sandia LLC, a wholly owned subsidiary of Honeywell International Inc. for the
U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.
