Volume 43, Number 4, August II 1998
|Page(s)||422 - 426|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Excitations in superfluid beyond the roton
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
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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