Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Antiprotons from spallations of cosmic rays on interstellar matter   Cosmic ray antiprotons provide an important probe for the study of the
galactic Dark Matter, as they could be produced by exotic sources. On the other
hand, antiprotons are anyway produced by standard nuclear reactions of cosmic
ray nuclei on interstellar matter. This process is responsible for a background
flux that must be carefully determined to estimate the detectability of an
hypothetical exotic signal. Estimates of this background suffer from potential
uncertainties of various origins. The propagation of cosmic antiprotons depends
on several physical characteristics of the Galaxy which are poorly known.
Antiprotons are created from cosmic protons and helium nuclei whose fluxes were
not measured with great accuracy until very recently. Calculations of
antiproton fluxes make use of nuclear physics models with their own
shortcomings and uncertainties. The goal of this paper is to give a new
evaluation of the cosmic antiproton flux along with the associated
uncertainties. The propagation parameters were tightly constrained in Maurin et
al. 2001 by an analysis of cosmic ray nuclei data in the framework of a
two-zone diffusion model and we apply these parameters to the propagation of
antiprotons. We use the recently published data on proton and helion fluxes,
and we find that this particular source of uncertainty has become negligible.
The Monte Carlo program DTUNUC was used to carefully examine nuclear reactions.
We find that all the cosmic antiproton fluxes naturally coming out of the
calculation are fully compatible with experimental data. Uncertainties in this
flux have been strongly reduced. Those related to propagation are less than
25%. All other possible sources of uncertainty have also been studied.

7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg