Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Octupole correlations in collective excitations of neutron-rich
  $N\approx56$ nuclei   Octupole correlations in the low-energy collective states of neutron-rich
nuclei near the neutron number $N=56$ are studied within the interacting boson
model (IBM) based on the nuclear density functional theory. The constrained
self-consistent mean-field (SCMF) calculations using a universal energy density
functional and a pairing interaction provide the potential energy surfaces in
terms of the axially-symmetric quadrupole and octupole deformations for the
even-even nuclei $^{86-94}$Se, $^{88-96}$Kr, $^{90-98}$Sr, $^{92-100}$Zr, and
$^{94-102}$Mo. Spectroscopic properties are computed in terms of the IBM that
consists of the monopole $s$, quadrupole $d$, and octupole $f$ bosons. Strength
parameters for the boson Hamiltonian are determined by mapping the SCMF energy
surface onto the expectation value of the Hamiltonian in the boson condensate
state. At the SCMF level, no octupole deformed ground-state shape is found,
while the energy surface is generally soft in the octupole deformation at
$N\approx56$. The predicted negative-parity yrast bands with the bandhead state
$3^-_1$ weakly depend on $N$ and become lowest in energy at $N=56$ in each of
the considered isotopic chains. The model further predicts finite electric
octupole transition rates between the lowest negative-parity and the
positive-parity ground-state bands.

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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin