Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calculations of the Efficiency of Registration of Thermal Neutrons by
  Complex Converters Constructed on the Basis of Gadolinium Foils   We consider the results of modeling of the efficiency of registration of
thermal neutrons by the converters, which are made from natural gadolinium and
its 157 isotope foils. Efficiency for a case of falling of neutrons under
various angles to a plane of converters is calculated. It is shown, that at
small angles of falling of neutrons to a plane of converters it is possible to
receive the efficiency of registration close to a theoretical limit. Efficiency
of the complex converter made of kapton supporting film with gadolinium
converters layered on both its sides is considered. All calculations are
carried out for four fixed neutron energies, which correspond to the
wavelengths of 1, 1.8, 3 and 4 $\AA$.

24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph