Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NuGrid: s process in massive stars   The s-process production in massive stars at very low metallicities is
expected to be negligible due to the low abundance of the neutron source 22Ne,
to primary neutron poisons and decreasing iron seed abundances. However, recent
models of massive stars including the effects of rotation show that a strong
production of 22Ne is possible in the helium core, as a consequence of the
primary nitrogen production (observed in halo metal poor stars). Using the PPN
post-processing code, we studied the impact of this primary 22Ne on the s
process. We find a large production of s elements between strontium and barium,
starting with the amount of primary 22Ne predicted by stellar models. There are
several key reaction rate uncertainties influencing the s-process efficiency.
Among them, 17O(alpha,gamma) may play a crucial role strongly influencing the s
process efficiency, or it may play a negligible role, according to the rate
used in the calculations. We also report on the development of a new parallel
(MPI) post-processing code (MPPNP) designed to follow the complete
nucleosynthesis in stars on highly resolved grids. We present here the first
post-processing run from the ZAMS up to the end of helium burning for a 15
solar mass model.

22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol