Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental determination of the $6s^2 ^1S_0 -> 5d6s ^3 D_1$
  magnetic-dipole transition amplitude in atomic ytterbium   We report on a measurement of the highly forbidden $6s^2 ^1S_0 \to 5d6s ^3
D_1$ magnetic-dipole transition in atomic ytterbium using the
Stark-interference technique. This amplitude is important in interpreting a
future parity nonconservation experiment that exploits the same transition. We
find $| < 5d6s ^3 D_1 | M1 | 6s^2 ^1S_0 > | ~ = ~ 1.33(6)_{Stat}(20)_{\beta}
\times 10^{-4} \mu_0$, where the larger uncertainty comes from the previously
measured vector transition polarizability $\beta$. The $M1$ amplitude is small
and should not limit the precision of the parity nonconservation experiment.

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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex