Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The vertical composition of neutrino-dominated accretion disks in
  gamma-ray bursts   We investigate the vertical structure and elements distribution of
neutrino-dominated accretion flows around black holes in spherical coordinates
with the reasonable nuclear statistical equilibrium. According our
calculations, heavy nuclei tend to be produced in a thin region near the disk
surface, whose mass fractions are primarily determined by the accretion rate
and the vertical distribution of temperature and density. In this thin region,
we find that $^{56}\rm Ni$ is dominant for the flow with low accretion rate
(e.g., $0.05 $$M_{\odot}$ $\rm s^{-1}$) but $^{56}\rm Fe$ is dominant for the
high counterpart (e.g., $1 M_{\odot}$ $\rm s^{-1}$). The dominant $^{56}\rm Ni$
in the special region may provide a clue to understand the bumps in the optical
light curve of core-collapse supernovae.

31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th