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In this comment I show that the experimental data on quantum diffusion of3-He impurities in solid 4-He can be explained using the adopted quasiparticletheory. The contention by E.G. Kisvarsanyi and N.S. Sullivan (KS) in Phys.Rev.Bv. 48, 16557 (1993) as well as in their Reply (ibid. v. 55, 3989 (1997)) to theGrigor'ev's Comment (Phys.Rev. B v. 55, 3987 (1997)) that "Pushkarov's theoryof phonon scattering fails to fit the data by very large factors" is groundlessand may result from their bad arithmetical error. This means that thephonon-impurity scattering mechanism of diffusion is consistent with experimentand its neglecting by KS makes their results questionable.Comment: RevTex, 5 pages, no figures, to be published in Phys.Rev.

physical review. b, condensed matter

Comment on “Quantum diffusion of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:math>impurities in solid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:math>”

Comment on “Quantum diffusion of3Heimpurities in solid4He”