Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The 13C-Pocket Structure in AGB Models: Constraints from Zirconium
  Isotope Abundances in Single Mainstream SiC Grains   We present postprocess AGB nucleosynthesis models with different
$^{13}$C-pocket internal structures to better explain zirconium isotope
measurements in mainstream presolar SiC grains by Nicolussi et al. (1997) and
Barzyk et al. (2007). We show that higher-than-solar $^{92}$Zr/$^{94}$Zr ratios
can be predicted by adopting a $^{13}$C-pocket with a flat $^{13}$C profile,
instead of the previous decreasing-with-depth $^{13}$C profile. The improved
agreement between grain data for zirconium isotopes and AGB models provides
additional support for a recent proposal of a flat $^{13}$C profile based on
barium isotopes in mainstream SiC grains by Liu et al. (2014).

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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex