Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of shock propagation and nucleosynthesis conditions in O-Ne-Mg
  core supernovae   It has been recently proposed that the shocked surface layers of exploding
O-Ne-Mg cores provide the conditions for r-process nucleosynthesis, because
their rapid expansion and high entropies enable heavy r-process isotopes to
form even in an environment with very low initial neutron excess of the matter.
We show here that the most sophisticated available hydrodynamic simulations (in
spherical and axial symmetry) do not support this new r-process scenario
because they fail to provide the necessary conditions of temperature, entropy,
and expansion timescale by significant factors. This suggests that, either the
formation of r-process elements works differently than suggested by Ning et al.
(2007, NQM07), or that some essential core properties with influence on the
explosion dynamics might be different from those predicted by Nomoto's
progenitor model.

17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys