| Issue |
Europhys. Lett.
Volume 43, Number 4, August II 1998
|
|
|---|---|---|
| Page(s) | 422 - 426 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00375-2 | |
| Published online | 01 September 2002 | |
Excitations in superfluid 
beyond the roton
1
Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
2
Department of Physics, University of Exeter - Exeter EX4 4QL, UK
3
Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
4
ISIS Science Division, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK
Received:
1
December
1997
Accepted:
29
June
1998
High-energy resolution inelastic neutron scattering data on
excitations in superfluid and normal at SVP at wave vectors Q
beyond the roton, 
, are
presented. The narrow energy resolution of these measurements reveals
that the energy of the elementary excitation comes up to twice the
roton energy, 
, at 
and the energy remains
constant at between 
and the end point of
the dispersion curve at 
. The width of the peak is also
unobservably small from 
out to the end point, 
.
PACS: 67.40.Db – Quantum statistical theory; ground state, elementary excitations / 61.12.-q – Neutron diffraction and scattering
© EDP Sciences, 1998
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