Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Isoscalar Giant Dipole Resonances in Spherical Nuclei - Macroscopic
  Description   The properties of the Isoscalar Giant Dipole Resonance (ISGDR) and its
electromagnetic structure are investigated within a semiclassical nuclear
Fermi-Fluid dynamical approach. Microscopical calculations pointing to a ISGDR
distribution splitted into two main broad structures is confirmed within the
presented macroscopic approach by the occurence of a ''low-lying'' and a
''high-lying'' state, that are nothing else than the first two overtones of the
same resonance. Macroscopically they are pictured as a combination of
compressional and vortical nuclear flows. In the second part of the paper the
electromagnetic structure of the ISGDR, relevant for reactions with
inelastically scattered electrons, and the relation between the vorticity and
the toroidal dipole moment is analyzed. The relative strengths of the
compresional and vortical collective currents is evaluated by means of
electron-scattering sum-rules.

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The categories of this paper are: stat
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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: plasm-ph
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The categories of this paper are: atom-ph
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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: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org