A new determination of the roton energy in superfluid liquid helium
- 5 February 1977
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 10 (3) , L45-L49
- https://doi.org/10.1088/0022-3719/10/3/002
Abstract
The energies of excitations in the region of the minimum in the dispersion curve for superfluid liquid 4He have been determined at SVP and T=0.75K using neutron inelastic scattering. The value of Delta /k is 8.618+or-0.009K. Comparison with recent Raman-scattering measurements gives a value of the roton-roton binding energy of 0.027+or-0.04K at Q=0.Keywords
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