Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon spin structure measurements at Jefferson Lab   We summarize the measurements investigating the nucleon spin structure done
at Jefferson Lab, a multi-GeV continuous electron beam facility located in
Newport News, Virgina, USA. After motivating spin structure studies, we explain
how Jefferson Lab uniquely contributes to them and describe the experimental
program that was achieved with energies up to 6 GeV. We then discuss the
continuation of this program at the higher energies now available thanks to the
recent 12 GeV upgrade of Jefferson Lab's accelerator.

21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph