Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An inhomogeneous model for the Galactic halo: a possible explanation for
  the spread observed in s- and r-process elements   We propose an explanation for the considerable scatter of the abundances of
neutron capture elements observed in low-metallicity stars in the solar
vicinity, compared to the small star-to-star scatter observed for the
alpha-elements. We have developed a stochastic chemical evolution model in
which the main assumption is a random formation of new stars subject to the
condition that the cumulative mass distribution follows a given initial mass
function. With our model, we are able to reproduce the different spreads of
neutron capture elements and alpha-elements in low-metallicity stars. The
reason for different observed spread in neutron capture elements and
alpha-elements resides in the random birth of stars, coupled with different
stellar mass ranges, from which alpha-elements and neutron capture elements
originate. In particular, the site of production of alpha-elements is the whole
range of massive stars, from 10 to 80 Msun whereas the mass range of production
for neutron capture elements lies between 12 and 30 Msun.

34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex