Neutron Brillouin scattering study of collective dynamics in a dense He-Ne gaseous mixture

The dynamic structure factor S(k,?) of a 77% He and 23% Ne gaseous mixture at T = 39.3 K and total number density n = 15.8 nm-3 has been measured by inelastic neutron scattering at small angles. In the range of wave vectors studied, 0.7