Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radioactive 7Be targets for measurements of the cross section of the
  7Be(p,gamma) reaction   The interpretation of the most recent solar neutrinos experiments requires a
good knowledge of the cross section of the reaction 7Be(p,gamma)8B at very
small energy (Ecm=18 keV). We have recently measured this cross section for
Ecm=0.35-1.4 MeV and for Ecm=0.112-0.190 MeV. We report here on the description
of the preparation of the radioactive targets of 7Be used in these experiments.

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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga