Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Properties of the ground $^3$F$_2$ state and the excited $^3$P$_0$ state
  of atomic thorium in cold collisions with $^3$He   We measure inelastic collisional cross sections for the ground $^3$F$_2$
state and the excited $^3$P$_0$ state of atomic thorium in cold collisions with
$^3$He. We determine for Th ($^3$F$_2$) at 800 mK the ratio $\gamma \approx
500$ of the momentum-transfer to Zeeman relaxation cross sections for
collisions with $^3$He. For Th ($^3$P$_0$), we study electronic inelastic
processes and find no quenching even after $10^6$ collisions. We also determine
the radiative lifetime of Th ($^3$P$_0$) to be $\tau > 130$ ms. This great
stability of the metastable state opens up the possibility for further study,
including trapping.

37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol