Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New theoretical description of neutron scattering in a monatomic liquid   In a recently developed theory of the atomic motion in monatomic liquids, the
motion is comprised of normal mode vibrations in any of the large number of
equivalent random valleys, interspersed with nearly instantaneous transits
which carry the system between neighboring valleys. The consequences for the
dynamical structure factor S(q,w) are presented here: when the system moves in
a single random valley, the inelastic part of S(q,w) is a sum over all
vibrational modes of the inelastic cross section of each single mode; in the
liquid state the system undergoes transits at a rapid rate, causing the
Rayleigh and Brillouin peaks to broaden but not to shift; over the entire q
range where the Brillouin peak is distinguishable, its location in the liquid
is the same as it is in a single random valley. These properties are verified
by comparison between theory and MD calculations. We believe our theory
provides a physically realistic approach for the study of liquid dynamics.

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph