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The recently discovered shear modulus anomaly in solid 4He bears a strongsimilarity to the phenomenon of supersolidity in solid 4He and can lead to theperiod shift and dissipative signals in torsional oscillator experiments thatare nearly identical to the classic NCRI signals observed by Kim and Chan. Inthe experiments described here, we attempt to isolate the effects of these twophenomena on the resonance periods of torsion oscillators. We have constructeda triple compound oscillator with distinct normal modes. We are able todemonstrate that, for this oscillator, the period shifts observed below 200 mKhave their primary origin in the temperature dependence of the shear modulus ofthe solid 4He sample rather than the formation of a supersolid state.

Study of Supersolidity and Shear Modulus Anomaly of 4He in a Triple Compound Oscillator