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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Measurement of the Ionization State and Electron Temperature of Plasma during the Ablation Stage of a Wire-Array Z Pinch Using Absorption Spectroscopy
Wire-array plasmas were investigated in the nonradiative ablation stage via x-ray absorption spectroscopy. A laser-produced Sm plasma was used to backlight Al wire arrays. The Sm spectrum was simultaneously observed by two spectrometers: one recorded the unattenuated spectrum and the other the transmission spectrum with 1.45-1.55 keV K-shell absorption lines. Analysis of absorption spectra revealed electron temperature in the range of 10-30 eV and the presence of F-, O-, N- and C-like Al ions in the absorbing plasma. A comparison of this electron temperature with the postprocessed absorption spectra of a 2D MHD simulation yields results in general agreement with the data analysis.
Measurement of Spin Correlation in tt̄ Production Using a Matrix Element Approach
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Ion Temperature and Hydrodynamic-Energy Measurements in a Z-Pinch Plasma at Stagnation
The time history of the local ion kinetic energy in a stagnating plasma was determined from Doppler-dominated line shapes. Using independent determination of the plasma properties for the same plasma region, the data allowed for inferring the time-dependent ion temperature, and for discriminating the temperature from the total ion kinetic energy. It is found that throughout most of the stagnation period the ion thermal energy constitutes a small fraction of the total ion kinetic energy; the latter is dominated by hydrodynamic motion. Both the ion hydrodynamic and thermal energies are observed to decrease to the electron thermal energy by the end of the stagnation period. It is confirmed that the total ion kinetic energy available at the stagnating plasma and the total radiation emitted are in balance, as obtained in our previous experiment. The dissipation time of the hydrodynamic energy thus appears to determine the duration (and power) of the K emission.
Time-Resolved Measurements of Hot-Electron Equilibration Dynamics in High-Intensity Laser Interactions with Thin-Foil Solid Targets
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Precision Measurement of the 6 He Half-Life and the Weak Axial Current in Nuclei
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First Measurements of Rayleigh-Taylor-Induced Magnetic Fields in Laser-Produced Plasmas
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Determination of the Strange-Quark Density of the Proton from ATLAS Measurements of the W greater than lv and Z greater than ll Cross Sections
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Measurements of the T ( t , 2 n ) He 4 Neutron Spectrum at Low Reactant Energies from Inertial Confinement Implosions
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Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set
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Measurement of the Semileptonic Charge Asymmetry using B s 0 → D s μ X Decays
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Measurement of the Υ ( 1 S ) , Υ ( 2 S ) , and Υ ( 3 S ) Polarizations in p p Collisions at s = 7 TeV
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