First systematic study of L-shell opacity at stellar interior temperatures

Nagayama, Taisuke; Bailey, J. E.; Loisel, G. P.; Dunham, G. S.; Rochau, G. A.; Blancard, C.; Colgan, James Patrick; Cosse, Ph.; Fausurrier, G.; Fontes, Christopher John; Gilleron, F.; Hansen, S. B.; Iglesias, C. A.; Golovkin, I. E.; Kilcrease, David Parker; MacFarlane, J. J.; Mancini, R. C.; More, R.; Orban, C.; Pain, J.-C.; Sherrill, Manolo Edgar; Wilson, B. G.

doi:10.1103/PhysRevLett.122.235001

First systematic study of L-shell opacity at stellar interior temperatures

Journal Article · Fri Jun 14 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.235001· OSTI ID:1776755

Nagayama, Taisuke ^[1]; Bailey, J. E. ^[2]; Loisel, G. P. ^[2]; Dunham, G. S. ^[2]; Rochau, G. A. ^[2]; Blancard, C. ^[3]; ^[4]; Cosse, Ph. ^[3]; Fausurrier, G. ^[3]; ^[4]; Gilleron, F. ^[3]; Hansen, S. B. ^[2]; Iglesias, C. A. ^[5]; Golovkin, I. E. ^[6]; ^[4]; MacFarlane, J. J. ^[6]; Mancini, R. C. ^[7]; More, R. ^[2]; Orban, C. ^[8]; Pain, J.-C. ^[3] more »

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
CEA, DAM, Arpajon (France)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Prism Computational Sciences, Madison, WI (United States)
Univ. of Nevada, Reno, NV (United States)
The Ohio State Univ., Columbus, OH (United States)

The first systematic study of opacity dependence on atomic number at stellar interior temperatures is used to evaluate discrepancies between measured and modeled iron opacity [J. E. Bailey et al., Nature (London) 517, 56 (2015)]. High-temperature ( > 180 eV) chromium and nickel opacities are measured with ± 6-10% uncertainty, using the same methods employed in the previous iron experiments. The 10%-20% experiment reproducibility demonstrates experiment reliability. The overall model-data disagreements are smaller than for iron. However, the systematic study reveals shortcomings in models for density effects, excited states, and open L-shell configurations. The 30%-45% underestimate in the modeled quasicontinuum opacity at short wavelengths was observed only from iron and only at temperature above 180 eV. Thus, either opacity theories are missing physics that has nonmonotonic dependence on the number of bound electrons or there is an experimental flaw unique to the iron measurement at temperatures above 180 eV.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001; NA0003525

OSTI ID:: 1776755

Alternate ID(s):: OSTI ID: 1546397

Report Number(s):: LA-UR--19-21766

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 122; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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