First systematic study of L-shell opacity at stellar interior temperatures
Abstract
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.
- Authors:
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[4];
[4];
[4];
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)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1776755
- Alternate Identifier(s):
- OSTI ID: 1546397
- Report Number(s):
- LA-UR-19-21766
Journal ID: ISSN 0031-9007; TRN: US2209388
- Grant/Contract Number:
- 89233218CNA000001; NA0003525; NA-0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 23; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; opacity
Citation Formats
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, and Wilson, B. G. First systematic study of L-shell opacity at stellar interior temperatures. United States: N. p., 2019.
Web. doi:10.1103/PhysRevLett.122.235001.
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. First systematic study of L-shell opacity at stellar interior temperatures. United States. https://doi.org/10.1103/PhysRevLett.122.235001
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, and Wilson, B. G. Fri .
"First systematic study of L-shell opacity at stellar interior temperatures". United States. https://doi.org/10.1103/PhysRevLett.122.235001. https://www.osti.gov/servlets/purl/1776755.
@article{osti_1776755,
title = {First systematic study of L-shell opacity at stellar interior temperatures},
author = {Nagayama, Taisuke and Bailey, J. E. and Loisel, G. P. and Dunham, G. S. and Rochau, G. A. and Blancard, C. and Colgan, James Patrick and Cosse, Ph. and Fausurrier, G. and Fontes, Christopher John and Gilleron, F. and Hansen, S. B. and Iglesias, C. A. and Golovkin, I. E. and Kilcrease, David Parker and MacFarlane, J. J. and Mancini, R. C. and More, R. and Orban, C. and Pain, J.-C. and Sherrill, Manolo Edgar and Wilson, B. G.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.122.235001},
journal = {Physical Review Letters},
number = 23,
volume = 122,
place = {United States},
year = {Fri Jun 14 00:00:00 EDT 2019},
month = {Fri Jun 14 00:00:00 EDT 2019}
}
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Works referencing / citing this record:
High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem
text, January 2020
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