Effects of ${}^3$He Impurity on Solid ${}^4$He Studied by Compound Torsional Oscillator

P. Gumann, M. C. Keiderling, D. Ruffner +1

Frequency shifts and dissipations of a compound torsional oscillator induced by solid ${}^4$He samples containing ${}^3$He impurity concentrations ($x_3$ = 0.3, 3, 6, 12 and 25 in unit…