Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-channel approach to the average retarding force of metals for slow
  singly ionized projectiles   Based on the fundamental momentum-transfer theorem [Phys. Rev. Lett. 15, 11
(1965)] a novel contribution to the retarding force of metallic systems for
slow intruders is derived. This contribution is associated with sudden
charge-changing cycles during the path of projectiles. The sum of the novel and
the well-known conventional contributions, both expressed in terms of
scattering phase shifts, are used to discuss experimental data obtained for
different targets. It is found that our two-channel modeling, with two
nonlinear channels, improves the agreement between several data and theory and
thus, as predictive modeling, can contribute to the desired convergence between
experimental and theoretical attempts on the retarding force.

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The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg