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Effective mass of the normal negative-charge carrier in bulk He II.

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<mark>Journal publication date</mark>28/06/1982
<mark>Journal</mark>Physical review letters
Issue number26
Number of pages4
Pages (from-to)1834-1837
Publication StatusPublished
<mark>Original language</mark>English


The first acceleration measurements are reported for negative ions in bulk superfluid 4He. Data recorded at 70 mK, 25 bars for electric fields in the range 80 < E < 150 V are consistent with an ionic dispersion relation identical to that of a free particle with mass (87 ± 5)m4, where m4 is the 4He atomic mass.