Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $^{62}$Ni($n,\gamma$) and $^{63}$Ni($n,\gamma$) cross sections measured
  at n_TOF/CERN   The cross section of the $^{62}$Ni($n,\gamma$) reaction was measured with the
time-of-flight technique at the neutron time-of-flight facility n_TOF at CERN.
Capture kernels of 42 resonances were analyzed up to 200~keV neutron energy and
Maxwellian averaged cross sections (MACS) from $kT=5-100$ keV were calculated.
With a total uncertainty of 4.5%, the stellar cross section is in excellent
agreement with the the KADoNiS compilation at $kT=30$ keV, while being
systematically lower up to a factor of 1.6 at higher stellar temperatures. The
cross section of the $^{63}$Ni($n,\gamma$) reaction was measured for the first
time at n_TOF. We determined unresolved cross sections from 10 to 270 keV with
a systematic uncertainty of 17%. These results provide fundamental constraints
on $s$-process production of heavier species, especially the production of Cu
in massive stars, which serve as the dominant source of Cu in the solar system.

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The categories of this paper are: physics
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The categories of this paper are: solv-int
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
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The categories of this paper are: stat
34
The categories of this paper are: chem-ph