Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On beryllium-10 production in gaseous protoplanetary disks and
  implications on the astrophysical setting of refractory inclusions   Calcium-Aluminum-rich Inclusions (CAIs), the oldest known solids of the solar
system, show evidence for the past presence of short-lived radionuclide
beryllium-10, which was likely produced by spallation during protosolar flares.
While such $^{10}$Be production has hitherto been modeled at the inner edge of
the protoplanetary disk, I calculate here that spallation at the disk surface
may reproduce the measured $^{10}$Be/$^9$Be ratios at larger heliocentric
distances. Beryllium-10 production in the gas prior to CAI formation would
dominate that in the solid. Interestingly, provided the Sun's proton to X-ray
output ratio does not decrease strongly, $^{10}$Be/$^9$Be at the CAI
condensation front would increase with time, explaining the reduced values in a
(presumably early) generation of CAIs with nucleosynthetic anomalies. CAIs thus
need not have formed very close to the Sun and may have condensed at 0.1-1 AU
where sufficiently high temperatures originally prevailed.

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The categories of this paper are: chem-ph
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The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat