Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On limits of ab initio calculations of pairing gap in nuclei   A brief review of recent microscopic calculations of nuclear pairing gap is
given. A semi-microscopic model is suggested in which the ab-initio effective
pairing interaction is supplemented with a small phenomenological addendum. It
involves a parameter which is universal for all medium and heavy nuclei.
Calculations for several isotopic and isotonic chains of semi-magic nuclei
confirm the relevance of the model.

26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph