Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Combined effects of nuclear Coulomb field, radial flow, and opaqueness
  on two-pion correlations   Correlations of two like charged pions emitted from a hot and charged
spherically expanding nuclear system are investigated. The motion of the pions
is described quantum mechanically using the Klein-Gordon equation which
includes Coulomb field and pion absorption. Flow modifies the radial
distribution of the source function and rescales the pion wave functions. The
radii extracted from the correlation functions are calculated in sideward and
outward direction as a function of the pair momentum. Comparison with recent
measurements at SIS and AGS energies is made.

11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
26
The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int