Zobrazeno 1 - 10
of 59
pro vyhledávání: '"David P. Kilcrease"'
An Expanded Set of Los Alamos OPLIB Tables in MESA: Type-1 Rosseland-mean Opacities and Solar Models
Autor:
Ebraheem Farag, Christopher J. Fontes, F. X. Timmes, Earl P. Bellinger, Joyce A. Guzik, Evan B. Bauer, Suzannah R. Wood, Katie Mussack, Peter Hakel, James Colgan, David P. Kilcrease, Manolo E. Sherrill, Tryston C. Raecke, Morgan T. Chidester
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 2, p 56 (2024)
We present a set of 1194 Type-1 Rosseland-mean opacity tables for four different metallicity mixtures. These new Los Alamos OPLIB atomic radiative opacity tables are an order of magnitude larger in number than any previous opacity table release, and
Externí odkaz:
https://doaj.org/article/97248622ae8a4820bdbfeeb1215edc19
Autor:
James E. Barefield, Nicholas R. Wozniak, Samuel M. Clegg, Elizabeth J. Judge, David P. Kilcrease, Kenneth R. Czerwinski, James Colgan, Marianne P. Wilkerson, Keri R. Campbell
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 134:91-97
Nuclear forensics goals for characterizing samples of interest include qualitative and quantitative analysis of major and trace elements, isotopic analysis, phase identification, and physical analysis. These samples may include uranium oxides UO2, U3
Autor:
Samuel M. Clegg, David P. Kilcrease, James Colgan, James E. Barefield, Kenneth R. Czerwinski, Elizabeth J. Judge, Keri R. Campbell
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 133:26-33
The analysis of light water reactor simulated used nuclear fuel using laser-induced breakdown spectroscopy (LIBS) is explored using a simplified version of the main oxide phase. The main oxide phase consists of the actinides, lanthanides, and zirconi
Publikováno v:
High Energy Density Physics. 23:31-37
A model for the free-free opacity of dense plasmas is presented. The model uses a previously developed average atom model, together with the Kubo-Greenwood model for optical conductivity. This, in turn, is used to calculate the opacity with the Krame
Autor:
Jadwiga Daszyńska-Daszkiewicz, David P. Kilcrease, A. A. Pamyatnykh, Chris Fontes, James Colgan, Przemysław Walczak
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 466:2284-2293
The analysis of the BRITE oscillation spectrum of the main sequence early B-type star $\nu$ Eridani is presented. Only models with the modified mean opacity profile can account for the observed frequency ranges as well as for the values of some indiv
Autor:
David P. Kilcrease, Peter Hakel, Christopher J. Fontes, Jeffery A. Leiding, Eddy Timmermans, Mark C. Zammit, Robert C. Forrey, James Colgan, Dmitry V. Fursa, M. Charlton, Alisher Kadyrov, Svante Jonsell, Jeremy S. Savage, Igor Bray
The feasibility of producing the molecular antihydrogen anion ${{\overline{\mathrm{H}}}_{2}}^{\ensuremath{-}}$ in the laboratory is investigated. Utilizing reaction rates calculated here involving the interaction of laser excited-state antihydrogen a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82162800c67c950b1a2d4c1a9df6ee70
https://cronfa.swan.ac.uk/Record/cronfa52838/Download/52838__15957__20e07ba6f35a412b87264c0bf5db2117.pdf
https://cronfa.swan.ac.uk/Record/cronfa52838/Download/52838__15957__20e07ba6f35a412b87264c0bf5db2117.pdf
Autor:
Elizabeth J. Judge, James E. Barefield, James Colgan, Keri R. Campbell, David P. Kilcrease, Samuel M. Clegg, Heather Johns
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 122:142-148
The goal of this work was to investigate the matrix effect of copper in the presence of sodium or magnesium in a laser-induced plasma. Varying amounts of copper were mixed and pressed with a constant amount of sodium or magnesium and a stearic acid b
Autor:
Heather Johns, Elizabeth J. Judge, James Colgan, Roger C. Wiens, Samuel M. Clegg, Ronald K. Martinez, David P. Kilcrease, Keri R. Campbell, Rhonda E. McInroy, James E. Barefield
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 120:1-8
Laser induced breakdown spectroscopy (LIBS) is a rapid atomic emission spectroscopy technique that can be configured for a variety of applications including space, forensics, and industry. LIBS can also be configured for stand-off distances or in-sit
Autor:
Aimee Hungerford, Peter Hakel, M. E. Sherrill, Christopher J. Fontes, David P. Kilcrease, Chris L. Fryer, James Colgan
Publikováno v:
High Energy Density Physics. 16:53-59
We report on the use of the Los Alamos suite of relativistic atomic physics codes to generate radiative opacities for the modeling of astrophysically relevant plasmas under local thermodynamic equilibrium (LTE) conditions. The atomic structure calcul
Publikováno v:
Physical Review B. 96
Using all-electron density functional theory, we have performed an ab initio study on x-ray absorption spectra of highly compressed polystyrene (CH). We found that the $K$-edge shifts in strongly coupled, degenerate polystyrene cannot be explained by