Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theoretical analysis of neutron and X-ray scattering data on He-3   X-ray scattering experiments on bulk liquid He-3 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 of excitations in
He-4. 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.

1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio