Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galactic Cosmic Ray Origins and OB Associations: Evidence from
  SuperTIGER Observations of Elements $_{26}$Fe through $_{40}$Zr   We report abundances of elements from $_{26}$Fe to $_{40}$Zr in the cosmic
radiation measured by the SuperTIGER (Trans-Iron Galactic Element Recorder)
instrument during 55 days of exposure on a long-duration balloon flight over
Antarctica. These observations resolve elemental abundances in this charge
range with single-element resolution and good statistics.
  These results support a model of cosmic-ray origin in which the source
material consists of a mixture of 19$^{+11}_{-6}$\% material from massive stars
and $\sim$81\% normal interstellar medium (ISM) material with solar system
abundances. The results also show a preferential acceleration of refractory
elements (found in interstellar dust grains) by a factor of $\sim$4 over
volatile elements (found in interstellar gas) ordered by atomic mass (A). Both
the refractory and volatile elements show a mass-dependent enhancement with
similar slopes.

15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom