Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Convergent calculations of double ionization of helium: from
  ($\gamma$,2e) to (e,3e) processes   The first absolute (e,3e) measurements, by Lahmam-Bennani et al [Phys. Rev. A
{\bf 59}, 3548 (1999)], have been recently approximately reproduced by Berakdar
[Phys. Rev. Lett. {\bf 85}, 4036 (2000)] and supported by Jones and Madison
[Phys. Rev. Lett. {\bf 91}, 07321 (2003)], but with widely differing
conclusions. The former indirectly implied that the Born-CCC-based calculations
of Kheifets et al [J. Phys. B {\bf 32}, 5047 (1999) were invalid due to the
reliance on the 1st Born approximation. The latter argued that the 1st Born
approximation was valid, but the wrong initial state was used. We investigate
these claims and find that the original calculations of Kheifets et al are
reproduced whether the 2nd Born approximation is incorporated or if we use a
ground state similar to that of Jones and Madison, but appropriately corrected
as done by Le Sech and co-workers [J. Phys. B {\bf 23}, L739 (1990)].

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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg