= Ansel Cochran Anderson
{c}
{tag=Physicist}
{title2=1933–2015}
= Ansel C. Anderson
{c}
{synonym}
= A. C. Anderson
{c}
{synonym}
An experimental <condensed matter physicist> who coauthored an observation of <zero sound> in <helium-3>. The experiment probed a collective density wave in a regime where quasiparticle collisions are slow compared with the oscillation. This distinguishes collisionless quantum-fluid dynamics from ordinary hydrodynamic sound.<Propagation of Zero Sound in Liquid He3 at Low Temperatures by William Russell Abel and others>[Byline and low-temperature propagation experiment]{ref}
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