Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Production of new neutron-rich isotopes of heavy elements in
  fragmentation reactions of $^{238}$U projectiles at 1 A GeV   The production of heavy neutron-rich nuclei has been investigated using cold
fragmentation reactions of $^{238}$U projectiles at relativistic energies. The
experiment performed at the high-resolving-power magnetic spectrometer FRS at
GSI allowed to identify 45 new heavy neutron-rich nuclei: $^{205}$Pt,
$^{207-210}$Au, $^{211-216}$Hg, $^{213-217}$Tl, $^{215-220}$Pb, $^{219-224}$Bi,
$^{221-227}$Po, $^{224-229}$At, $^{229-231}$Rn and $^{233}$Fr. The production
cross sections of these nuclei were also determined and used to benchmark
reaction codes that predict the production of nuclei far from stability.

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The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph