Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Search for Spontaneous Radiation from Wavefunction Collapse in the
  Majorana Demonstrator   The \textsc{Majorana Demonstrator} neutrinoless double-beta decay search
experiment comprises a 44 kg (30 kg enriched in $^{76}$Ge) array of p-type,
point-contact germanium detectors. With its unprecedented energy resolution and
ultra-low backgrounds, \textsc{Majorana} also searches for rare event
signatures from beyond Standard Model physics in the low energy region below 50
keV. In this letter, we test the continuous spontaneous localization (CSL)
model, one of the mathematically well-motivated wavefunction collapse models
aimed at solving the long-standing unresolved quantum mechanical measurement
problem. While the CSL predicts the existence of a detectable radiation
signature in the X-ray domain, we find no evidence of such radiation in the
14.5-46 keV range in a 38.35 kg-y enriched germanium exposure collected between
Dec. 31, 2015 and Nov. 27, 2018 with the \textsc{Demonstrator}. We explored
both the mass-proportional (m-p) and the non-mass-proportional (n-m-p) versions
of the CSL with two different assumptions: that only the quasi-free electrons
can emit the X-ray radiation and that the nucleus can coherently emit an
amplified radiation. In all cases, we set the most stringent upper limit to
date on the collapse rate, $\lambda$, in the parameter space below
$r_\mathrm{C}=10^{-6}$ m for the white CSL model, where $r_\mathrm{C}$ is the
correlation length of the collapse noise field. If the result is interpreted in
terms of the Di\`{o}si-Penrose (DP) gravitational wavefunction collapse model,
the lower bound with a 95\% confidence level is more than two orders of
magnitude improvement over the previous best limit.

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The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
3
The categories of this paper are: physics
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The categories of this paper are: funct-an
1
The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
9
The categories of this paper are: nlin