Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct determination of the atomic mass difference of Re187 and Os187
  for neutrino physics and cosmochronology   For the first time a direct determination of the atomic mass difference of
187Re and 187Os has been performed with the Penning-trap mass spectrometer
SHIPTRAP applying the novel phase-imaging ion-cyclotron-resonance technique.
The obtained value of 2492(30stat)(15sys) eV is in excellent agreement with the
Q values determined indirectly with microcalorimetry and thus resolves a
long-standing discrepancy with older proportional counter measurements. This is
essential for the determination of the neutrino mass from the beta-decay of
187Re as planned in future microcalorimetric measurements. In addition, an
accurate mass difference of 187Re and 187Os is also important for the
assessment of 187Re for cosmochronology.

26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ