Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ground-state $g$ factor of highly charged $^{229}$Th ions: an access to
  the M1 transition probability between the isomeric and ground nuclear states   A method is proposed to determine the $M1$ nuclear transition amplitude and
hence the lifetime of the "nuclear clock transition" between the low-lying
($\sim 8$ eV) first isomeric state and the ground state of $^{229}$Th from a
measurement of the ground-state $g$ factor of few-electron $^{229}$Th ions. As
a tool, the effect of nuclear hyperfine mixing (NHM) in highly charged
$^{229}$Th-ions such as $^{229}$Th$^{89+}$ or $^{229}$Th$^{87+}$ is utilized.
The ground-state-only $g$-factor measurement would also provide first
experimental evidence of NHM in atomic ions. Combining the measurements for H-,
Li-, and B-like $^{229}$Th ions has a potential to improve the initial result
for a single charge state and to determine the nuclear magnetic moment to a
higher accuracy than that of the currently accepted value. The calculations
include relativistic, interelectronic-interaction, QED, and nuclear effects.

17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph