Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical ejecta of neutron star mergers with nucleonic weak processes
  I: Nucleosynthesis   We present a coherent study of the impact of neutrino interactions on the
r-process element nucleosynthesis and the heating rate produced by the
radioactive elements synthesised in the dynamical ejecta of neutron
star-neutron star (NS-NS) mergers. We have studied the material ejected from
four NS-NS merger systems based on hydrodynamical simulations which handle
neutrino effects in an elaborate way by including neutrino equilibration with
matter in optically thick regions and re-absorption in optically thin regions.
We find that the neutron richness of the dynamical ejecta is significantly
affected by the neutrinos emitted by the post-merger remnant, in particular
when compared to a case neglecting all neutrino interactions. Our
nucleosynthesis results show that a solar-like distribution of r- process
elements with mass numbers $A \gtrsim 90$ is produced, including a significant
enrichment in Sr and a reduced production of actinides compared to simulations
without inclusion of the nucleonic weak processes. The composition of the
dynamically ejected matter as well as the corresponding rate of radioactive
decay heating are found to be rather independent of the system mass asymmetry
and the adopted equation of state. This approximate degeneracy in abundance
pattern and heating rates can be favourable for extracting the ejecta
properties from kilonova observations, at least if the dynamical component
dominates the overall ejecta. Part II of this work will study the light curve
produced by the dynamical ejecta of our four NS merger models.

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The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex