Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A cluster version of the GGT sum rule   We discuss the derivation of a ``cluster sum rule'' from the
Gellmann-Goldberger-Thirring (GGT) sum rule as an alternative to the
Thomas-Reiche-Kuhn (TRK) sum rule, which was used as the basis up to now. We
compare differences in the assumptions and approximations. Some applications of
the sum rule for halo nuclei, as well as, nuclei with a pronounced cluster
structure are discussed.

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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph