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• W1984926790 abstract "We present high-precision measurements of the dynamics of single atoms in superfluid ${}^{4}mathrm{He}$ at $T=1.6 mathrm{K}$ and saturated vapor pressure. The measurements were taken on the MARI instrument at the ISIS neutron-scattering facility, Rutherford-Appleton Laboratory. From the measurements we obtain a condensate fraction ${n}_{0}=6.0ifmmodepmelsetextpmfi{}2.0%$ at $T=1.6 mathrm{K}$. The final-state effects (FSE's) in the atomic response are also determined from the data in the form of a final-state broadening function, $R(Q,y)$. We find that this FS function is the same in the superfluid at $T=1.6 mathrm{K}$ as that determined previously in normal ${}^{4}mathrm{He}$ at $T=2.3 mathrm{K}$. If we reanalyze the data assuming that the superfluid has no condensate, i.e., ${n}_{0}=0$, then the data requires that the normal $n(mathbf{k})$ change dramatically between $T=2.3 mathrm{K}$ and $T=1.6 mathrm{K}$. Since such a change in $n(mathbf{k})$ is physically unexpected, given that $mathrm{kT}$ is much less than the zero-point energy, the data requires that a new contribution, such as a condensate, enter $n(mathbf{k})$ in the superfluid." @default.
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• W1984926790 date "1997-12-01" @default.
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• W1984926790 title "Condensate and final-state effects in superfluid<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>" @default.
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• W1984926790 doi "https://doi.org/10.1103/physrevb.56.14620" @default.
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