Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The octupole collective Hamiltonian. Does it follow the example of the
  quadrupole case?   A general form of the octupole collective Hamiltonian is introduced and
analyzed based on fundamental tensors in the seven-dimensional tensor space.
Possible definitions of intrinsic frames of reference possessing cubic symmetry
for the octupole tensor are considered. Cubic intrinsic octupole coordinates or
deformations are introduced. Shapes of the octupoloid are investigated. The
octupole collective Hamiltonian is expressed in intrinsic coordinates. An
intrinsic angular momentum carried by the octupole vibrations is discovered.
Small oscillations about an axially-symmetric pear shape are analyzed.
Formulation of a unified quadrupole-octupole collective model is discussed.

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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org