Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Energy levels and radiative rates for Ne-like ions from Cu
  to Ga" by N.~Singh and S.~Aggarwal [Pramana -- J. Phys. 89 (2017) 79]   Recently, N.~Singh and S.~Aggarwal [Pramana -- J. Phys. 89 (2017) 79] have
reported energies and lifetimes for 127 levels of three Ne-like ions, namely
Cu~XX, Zn~XXI and Ga~XXII. For the calculations they have adopted two
independent atomic structure codes, i.e. GRASP and FAC, and have concluded that
both codes give comparable energies. However, we find that the differences
between the two sets of energies are up to 1.5~Ryd (over 1.6$\times$10$^5$
wavenumbers) for many levels, and for all three ions. In the absence of other
available theoretical or experimental data, it becomes difficult to know which
set of energies is more accurate. Through our calculations with the same code
we demonstrate that their listings from the FAC calculations are incorrect. A
few more anomalies noted in their tabulated results are also highlighted.

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The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat