Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Search for Neutrinoless Double-Beta Decay in $^{76}$Ge with 26 kg-yr
  of Exposure from the MAJORANA DEMONSTRATOR   The MAJORANA Collaboration is operating an array of high purity Ge detectors
to search for the neutrinoless double-beta decay of $^{76}$Ge. The MAJORANA
DEMONSTRATOR consists of 44.1 kg of Ge detectors (29.7 kg enriched to 88% in
$^{76}$Ge) split between two modules constructed from ultra-clean materials.
Both modules are contained in a low-background shield at the Sanford
Underground Research Facility in Lead, South Dakota. We present updated results
on the search for neutrinoless double-beta decay in $^{76}$Ge with $26.0\pm0.5$
kg-yr of enriched exposure. With the DEMONSTRATOR's unprecedented energy
resolution of 2.53 keV FWHM at $Q_{\beta\beta}$, we observe one event in the
region of interest with 0.65 events expected from the estimated background,
resulting in a lower limit on the $^{76}$Ge neutrinoless double-beta decay
half-life of $2.7\times10^{25}$ yr (90% CL) with a median sensitivity of
$4.8\times10^{25}$ yr (90% CL). Depending on the matrix elements used, a 90% CL
upper limit on the effective Majorana neutrino mass in the range of 200-433 meV
is obtained. The measured background in the low-background configurations is
$11.9\pm2.0$ counts/(FWHM t yr).

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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: physics