Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiopurity assessment of the tracking readout for the NEXT double beta
  decay experiment   The Neutrino Experiment with a Xenon Time-Projection Chamber (NEXT) is
intended to investigate the neutrinoless double beta decay of 136Xe, which
requires a severe suppression of potential backgrounds; therefore, an extensive
screening and selection process is underway to control the radiopurity levels
of the materials to be used in the experimental set-up of NEXT. The detector
design combines the measurement of the topological signature of the event for
background discrimination with the energy resolution optimization. Separate
energy and tracking readout planes are based on different sensors:
photomultiplier tubes for calorimetry and silicon multi-pixel photon counters
for tracking. The design of a radiopure tracking plane, in direct contact with
the gas detector medium, was specially challenging since the needed components
like printed circuit boards, connectors, sensors or capacitors have typically,
according to available information in databases and in the literature,
activities too large for experiments requiring ultra-low background conditions.
Here, the radiopurity assessment of tracking readout components based on
gamma-ray spectroscopy using ultra-low background germanium detectors at the
Laboratorio Subterraneo de Canfranc (Spain) is described. According to the
obtained results, radiopure enough printed circuit boards made of kapton and
copper, silicon photomultipliers and other required components, fulfilling the
requirement of an overall background level in the region of interest of at most
8 10-4 counts keV-1 kg-1 y-1, have been identified.

21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th