Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic analysis of shape-phase transitions in even-even N~90
  rotating nuclei   We study in cranked Nilsson plus random phase approximation shape transitions
in fast rotating nuclei undergoing backbending, more specifically 156Dy and
162Yb. We found that a backbending in 156Dy is correlated with the
disappearance of the collective, positive signature gamma-vibrational mode in
the rotating frame, and, a shape transition (from axial to nonaxial) is
accompanied with a large acquiring of the gamma-deformation. We show that such
a shape transition can be considered as a phase transition of the first order.
In 162Yb the quasiparticle alignment dominates in the backbending and the shape
transition (from axial to nonaxial) is accompanied with a smooth transition
from zero to nonzero values of the gamma-deformation. We extend the classical
Landau theory for rotating nuclei and show that the backbending in 162Yb is
identified with the second order phase transition. A description of spectral
and decay properties of the yrast states and low-lying excitations demonstrates
a good agreement between our results and experimental data.

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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: econ