Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hydrodynamical study of neutrino-driven wind as an r-process site   We study the neutrino-driven wind from the proto-neutron star by the general
relativistic hydrodynamical simulations. We examine the properties of the
neutrino-driven wind to explore the possibility of the r-process
nucleosynthesis. The numerical simulations with the neutrino heating and
cooling processes are performed with the assumption of the constant neutrino
luminosity by using realistic profiles of the proto-neutron star (PNS) as well
as simplified models. The dependence on the mass of PNS and the neutrino
luminosity is studied systematically. Comparisons with the analytic treatment
in the previous studies are also done. In the cases with the realistic PNS, we
found that the entropy per baryon and the expansion time scale are neither high
nor short enough for the r-process within the current assumptions. On the other
hand, we found that the expansion time scale obtained by the hydrodynamical
simulations is systematically shorter than that in the analytic solutions due
to our proper treatment of the equation of state. This fact might lead to the
increase of the neutron-to-seed ratio, which is suitable for the r-process in
the neutrino-driven wind. Indeed, in the case of massive and compact
proto-neutron stars with high neutrino luminosities, the expansion time scale
is found short enough in the hydrodynamical simulations and the r-process
elements up to A ~ 200 are produced in the r-process network calculation.

27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ