Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleosynthesis inside accretion disks and outflows formed during core
  collapse of massive stars   We investigate nucleosynthesis inside the gamma-ray burst (GRB) accretion
disks and in the outflows launched from these disks mainly in the context of
Type II collapsars. We report the synthesis of several unusual nuclei like 31P,
39K, 43Sc, 35Cl and various isotopes of titanium, vanadium, chromium, manganese
and copper in the disk. We also confirm the presence of iron-group and
alpha-elements in the disk, as shown by previous authors. Much of these heavy
elements thus synthesized are ejected from the disk and survive in the
outflows. While emission lines of several of these elements have been observed
in the X-ray afterglows of GRBs by BeppoSAX, Chandra, XMM-Newton etc., Swift
seems to have not found these lines yet.

17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
19
The categories of this paper are: eess
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex