Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deuterated polyethylene coatings for ultra-cold neutron applications   We report on the fabrication and use of deuterated polyethylene (dPE) as a
coating material for ultra-cold neutron (UCN) storage and transport. The Fermi
potential has been determined to be 214~neV and the wall loss coefficient
$\eta$ is 1.3$\cdot$10$^4$ per wall collision. The coating technique allows for
a wide range of applications and new possibilities in this field of physics. In
particular, flexible and quasi-massless UCN guides with slit-less shutters and
slit-less UCN storage volumes become possible. These properties enable the use
in next-generation measurements of the electric dipole moment of the neutron.

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The categories of this paper are: stat
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph