Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement of parity and time invariance violation in Radium atom   There are several factors which lead to a huge enhancement of parity and time
invariance violating effects in the Ra atom: very close electronic levels of
opposite parity, the large nuclear charge Z and the collective nature of
T,P-odd nuclear moments. Experiments with Radium may be used to measure it's
nuclear anapole, magnetic quadrupole and Schiff moments. Such measurements
provide information about parity and time invariance violating nuclear forces
and electron-nucleon interactions.

19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph