67. Quantum fluids and solids; liquid and solid helium (see also 05.30
Quantum statistical mechanics)
67.20.+k Quantum effects on the structure and dynamics of nondegenerate fluids
(e.g., normal phase liquid helium-4)
67.40.-w Boson degeneracy and superfluidity of helium-4
67.40.Bz Phenomenology and two-fluid models
67.40.Db Quantum statistical theory; ground state, elementary excitations
67.40.Fd Dynamics of relaxation phenomena
67.40.Hf Hydrodynamics in specific geometries, flow in narrow channels
67.40.Jg Ions in liquid helium-4
67.40.Kh Thermodynamic properties
67.40.Mj First sound
67.40.Pm Transport processes, second and other sounds, and thermal counterflow;
Kapitza resistance
67.40.Rp Films and weak link transport
67.40.Vs Vortices and turbulence
67.40.Yv Impurities and other defects
67.55.-s Normal phase of liquid helium-3
67.55.Cx Thermodynamic properties
67.55.Fa Hydrodynamics
67.55.Hc Transport properties
67.55.Ig Ions in normal liquid helium-3
67.55.Jd Collective modes
67.55.Lf Impurities
67.57.-z Superfluid phase of liquid helium-3
67.57.Bc Thermodynamic properties
67.57.De Superflow and hydrodynamics
67.57.Fg Textures and vortices
67.57.Gh Ions in superfluid helium-3
67.57.Hi Transport properties
67.57.Jj Collective modes
67.57.Lm Spin dynamics
67.57.Np Behavior near interfaces
67.57.Pq Impurities
67.60.-g Mixed systems; liquid helium-3, helium-4 mixtures
67.60.Dm He I - helium-3
67.60.Fp He II - helium-3
67.60.Hr Dilute superfluid helium-3 in He II
67.60.Js Ions in liquid helium-3, helium-4 mixtures
67.65.+z Spin-polarized hydrogen and helium
67.70.+n Films (including physical adsorption)
67.80.-s Solid helium and related quantum crystals
67.80.Cx Structure, lattice dynamics, and sound propagation
67.80.Gb Thermal properties
67.80.Jd Magnetic properties and nuclear magnetic resonance
67.80.Mg Defects, impurities, and diffusion
67.90.+z Other topics in quantum fluids and solids; liquid and solid helium