Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positronium impact ionization of Alkali atoms   Target ionization processes of alkali atoms by Positronium impact are
investigated. Calculations are performed in the frame work of model potential
formalism using the Coulomb distorted eikonal approximation. Interesting
qualitative features are noted both in the scattered Ps and the ejected
electron distributions in differential as well as double differential levels of
the collision cross sections.

22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol