Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-resolution spectroscopy of gaseous $^\mathrm{83m}$Kr conversion
  electrons with the KATRIN experiment   In this work, we present the first spectroscopic measurements of conversion
electrons originating from the decay of metastable gaseous $^\mathrm{83m}$Kr
with the Karlsruhe Tritium Neutrino (KATRIN) experiment. The results obtained
in this calibration measurement represent a major commissioning milestone for
the upcoming direct neutrino mass measurement with KATRIN. The successful
campaign demonstrates the functionalities of the full KATRIN beamline. The
KATRIN main spectrometer's excellent energy resolution of ~ 1 eV made it
possible to determine the narrow K-32 and L$_3$-32 conversion electron line
widths with an unprecedented precision of ~ 1 %.

4
The categories of this paper are: cond-mat
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The categories of this paper are: math
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph