The dispersion law of 3He quasiparticles in He II under pressure
L. A. PogorelovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRB.N. Esel'sonPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRO. S. NosovitskayaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRВ. И. СоболевPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR
ABI
Аннотация
Data are obtained on the density of the normal component of a 3He–4He solution with a 3He content of 1.01% at various pressures up to 20 atm. The data are used to study the character of the impurity branch of the dispersion law of elementary excitations. It is shown that, as in the case of saturated-vapor pressures, 1,2 at elevated pressures short-wave excitations should decay, emitting a roton in the process, with the value of the critical momentum corresponding to the decay depending weakly on the pressure.
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