Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A proposed experimental method to determine $\alpha$-sensitivity of
  splitting between ground and 7.6 eV isomeric states in Th-229   The 7.6 eV electromagnetic transition between the nearly degenerate ground
state and first excited state in the Th-229 nucleus may be very sensitive to
potential changes in the fine-structure constant, $\alpha = e^2/\hbar c$.
However, the sensitivity is not known, and nuclear calculations are currently
unable to determine it. We propose measurements of the differences of atomic
transition frequencies between thorium atoms (or ions) with the nucleus in the
ground state and in the first excited (isomeric) state. This will enable
extraction of the change in nuclear charge radius and electric quadrupole
moment between the isomers, and hence the $\alpha$-dependence of the isomeric
transition frequency with reasonable accuracy.

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The categories of this paper are: eess
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
2
The categories of this paper are: math