caa a22 4500 445366818 CHVBK 20180317142933.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s10909-010-0308-y doi (NATIONALLICENCE)springer-10.1007/s10909-010-0308-y Theoretical Analysis of Neutron and X-ray Scattering Data on 3He [Elektronische Daten] [E. Krotscheck, M. Panholzer] X-ray scattering experiments on bulk liquid 3He (Albergamo et al. in Phys. Rev. Lett. 99:205301, 2007; Schmets and Montfrooij in Phys. Rev. Lett. 100:239601, 2008; Albergamo etal. in Phys. Rev. Lett. 100:239602, 2008) have indicated the possibility of the existence of a sharp collective mode at large momentum transfers. We address this issue within a manifestly microscopic theory of excitations in a Fermi fluid that can be understood as proper generalization of the time-honored theory of Jackson, Feenberg, and Campbell (Jackson in Phys. Rev. A 8:1529, 1973; Feenberg in Theory of Quantum Fluids, 1969; Chang and Campbell in Phys. Rev. B 13:3779, 1976) of excitations in 4He. We show that both neutron and X-ray data can be well explained within a theory where the high momentum excitations lie in fact inside the particle-hole continuum. "Pair fluctuations” contribute a sharpening of the mode compared to the random phase approximation (RPA). When the theoretical results are convoluted with the experimental resolution, the agreement between theory and X-ray data is quite good. The Author(s), 2010 Theory of liquid 3He nationallicence Dynamic structure function nationallicence Neutron-scattering nationallicence X-ray scattering nationallicence Krotscheck E. Institut für Theoretische Physik, Johannes Kepler Universität, 4040, Linz, Austria aut Panholzer M. Institut für Theoretische Physik, Johannes Kepler Universität, 4040, Linz, Austria aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 163/1-2(2011-04-01), 1-12 0022-2291 163:1-2<1 2011 163 10909 https://doi.org/10.1007/s10909-010-0308-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0308-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Krotscheck E. Institut für Theoretische Physik, Johannes Kepler Universität, 4040, Linz, Austria aut NATIONALLICENCE 700 1- Panholzer M. Institut für Theoretische Physik, Johannes Kepler Universität, 4040, Linz, Austria aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 163/1-2(2011-04-01), 1-12 0022-2291 163:1-2<1 2011 163 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer