Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-precision half-life determination of $^{14}$O via direct $\beta$
  counting   The half-life of the superallowed Fermi $\beta^+$ emitter $^{14}$O was
determined to high precision via a direct $\beta$ counting experiment performed
at the Isotope Separator and Accelerator (ISAC) facility at TRIUMF. The result,
$T_{1/2}$($^{14}$O) = 70619.2(76) ms, is consistent with, but is more precise
than, the world average obtained from 11 previous measurements. Combining the
$^{14}$O half-life deduced in the present work with the previous most precise
measurements of this quantity leads to a reduction in the overall uncertainty,
by nearly a factor of 2. The new world average is $T_{1/2}$($^{14}$O) =
70619.6(63) ms with a reduced $\chi^2$ value of 0.87 obtained from 8 degrees of
freedom.

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The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an