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Measurement of the Adiabatic Index in Be Compressed by Counterpropagating Shocks
Physical Review Letters
We report on the first direct measurement of the adiabatic index γ through X-ray Thomson Scattering from shock-compressed beryllium. 9 keV x-ray photons probe the bulk properties of matter during the collision of two counter-propagating shocks. This novel experimental technique determines γ using only the measured mass densities and vanishing particle velocity at the point of shock collision to close the Rankine-Hugoniot equations. We find γ > 5/3 at 3x compression, clearly different from idealdoi:10.1103/physrevlett.108.175006 pmid:22680877 fatcat:g6kp5y2xu5bfdkx6f4n7el4mf4