Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gradient Terms in the Microscopic Description of K-Atoms   We analyze the spectra of kaonic atoms using optical potentials withnon-local
(gradient) terms. The magnitude of the non-local termsfollows from a self
consistent many-body calculation of the kaon selfenergy in nuclear matter,
which is based on s-wave kaon nucleoninteractions. The optical potentials
exhibit strong non-linearitiesin the nucleon density and sizeable non-local
terms. We find that thenon-local terms are quantitatively important in the
analysis of thespectra and that a phenomenologically successful description can
be obtained for p-wave like optical potentials. It is suggested that
themicroscopic form of the non-local interaction terms is
obtainedsystematically by means of a semi-classical expansion of the
nucleusstructure. The resulting optical potential leads to less pronounced
non-local effects.

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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio