Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray energies of circular transitions and electrons screening in kaonic
  atoms   The QED contribution to the energies of the circular (n,l=n-1), 2 &#8804; n
&#8804; 19 transitions have been calculated for several kaonic atoms throughout
the periodic table, using the current world average kaon mass. Calculations
were done in the framework of the Klein-Gordon equation, with finite nuclear
size and all-order Uelhing vacuum polarization corrections, as well as Kallen
and Sabry and Wichmann and Kroll corrections. These energy level values are
compared with other computed values. The circular transition energies are
compared with available measured and theoretical transition energy. Electron
screening is evaluated using a Dirac-Fock model for the electronic part of the
wave function. The effect of electronic wavefunction correlation is evaluated
for the first time.

8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
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The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph