The regular periodic intensity bursts recently observed in the expansion of solid 4He into vacuum have anomalies that have been attributed to a transition to some new solid phase induced by excess vacancies. Here it is shown that a small concentration of 3He, from 1% down to 0.1%, added to the 4He solid is sufficient to remove all the anomalies. The origin of the observed anomalies is discussed in the light of these new experiments.
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Benedek, G., Grisenti, R.E., Käsz, M. et al. The Effect of 3He Impurities on Anomalous Oscillations in the Expansion of Solid 4He. J Low Temp Phys 146, 393–402 (2007). https://doi.org/10.1007/s10909-006-9273-x
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DOI: https://doi.org/10.1007/s10909-006-9273-x