Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Averaged number of prompt neutrons calculus for photo-fission of
  actinides   The empirical calculations of the prompt neutrons average number for
photofission of the 232Th, 233U, 234U, 235U, 236U, 238U, 237Np, 239Pu and 241Am
actinides has been done as a function of photon energy, mass and charge of the
nuclei, which can be used to evaluate the average number for photo-fission of
nuclides for which no or scarce data are available.

7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess