Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Apparatus for Measurement of the Electric Dipole Moment of the Neutron
  using a Cohabiting Atomic-Mercury Magnetometer   A description is presented of apparatus used to carry out an experimental
search for an electric dipole moment of the neutron, at the Institut
Laue-Langevin (ILL), Grenoble. The experiment incorporated a cohabiting
atomic-mercury magnetometer in order to reduce spurious signals from magnetic
field fluctuations. The result has been published in an earlier letter; here,
the methods and equipment used are discussed in detail.

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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: econ
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: math
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org