Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Macro-coherent radiative emission of neutrino pair between parity-even
  atomic states   A new scheme to determine the neutrino mass matrix is proposed using atomic
de-excitation between two states of a few eV energy spacing. The determination
of the smallest neutrino mass of the order of 1 meV and neutrino mass type,
Majorana or Dirac, becomes possible, if one can coherently excite more than 1
gram of atoms using two lasers.

14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th