Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamic screening and energy loss of antiprotons colliding with excited
  Al clusters   We use time-dependent density functional theory to calculate the energy loss
of an antiproton colliding with a small Al cluster previously excited. The
velocity of the antiproton is such that non-linear effects in the electronic
response of the Al cluster are relevant. We obtain that an antiproton
penetrating an excited cluster transfers less energy to the cluster than an
antiproton penetrating a ground state cluster. We quantify this difference and
analyze it in terms of the cluster excitation spectrum.

29
The categories of this paper are: funct-an
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph