Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On E0 Transitions in even-even nuclei   The reanimation of the investigations dedicated to 0^{+} states energies and
E0 transitions between them is provoked by new and more precise experimental
techniques that not only made revision of the previous data but also gave a
possibility to obtain a great amount of new 0^{+} states energies and
conversion electrons data. We suggest one phenomenological model for estimation
of the E0 transition nuclear matrix elements. Recently theoretical calculations
[1] predicted existence of a 0^{+} state with energy 0.68 MeV in ^{160}Dy
nucleus. Powerful enough arguments in favor of existence of 681.3 keV state in
^{160}Dy nucleus are presented.

31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat