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X-ray diffraction experiments show that solid 4He grown in aerogel is highlypolycrystalline, with a hcp crystal structure (as in bulk) and a crystallitesize of approximately 100 nm. In contrast to the expectation that the highlydisordered solid will have a large supersolid fraction, torsional oscillatormeasurements show a behavior that is strikingly similar to high purity crystalsgrown from the superfluid phase. The low temperature supersolid fraction isonly ~3x10-4 and the onset temperature is ~ 100 mK.

Torsional oscillator and synchrotron x-ray experiments on solid 4He in aerogel