Electron-ion temperature equilibration in warm dense tantalum by Hartley, N, Belancourt, P, Chapman, D, Döppner, T, Drake, R, Gericke, DO, Glenzer, S, Khaghani, D, LePape, S, Ma, T, Neumayer, P, Pak, A, Peters, L, Richardson, S, Vorberger, J, White, T, Gregori, G