Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing the nuclide 180W for neutrinoless double-electron capture
  exploration   The mass difference of the nuclides 180W and 180Hf has been measured with the
Penning-trap mass spectrometer SHIPTRAP to investigate 180W as a possible
candidate for the search for neutrinoless doubleelectron capture. The Q-value
was measured to 143.20(27)keV. This value in combination with the calculations
of the atomic electron wave functions and other parameters results in a
half-life of the 0+ \rightarrow 0+ ground-state to ground-state double-electron
capture transition of approximately 5\cdot10E27 years/<m_ee[eV]>^2.

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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph