Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atoms which can bind positrons   Calculations of the positron binding energies to all atoms in the periodic
table are presented and atoms where the positron-atom binding actually exists
are identified. The results of these calculations and accurate calculations of
other authors (which existed for several atoms only) are used to evaluate
recommended values of the positron binding energies to the ground states of
atoms. We also present the recommended energies of the positron excited bound
levels and resonances (due to the binding of positron to excited states of
atoms) which can not emit positronium and have relatively narrow widths. Such
resonances in positron annihilation and scattering may be used to measure the
positron binding energy.

12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex