Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The quest of shape coexistence in Zr isotopes   The mass region with A~100 and Z~40 is known to experience a sudden onset of
deformation. The presence of the subshell closure $Z=40$ makes feasible to
create particle-hole excitations at a moderate excitation energy and,
therefore, likely intruder states could be present in the low-lying spectrum.
In other words, shape coexistence is expected to be a key ingredient to
understand this mass region. The aim of this work is to describe excitation
energies, transition rates, radii, and two-neutron separation energies for the
even-even 94-110Zr nuclei and, moreover, to obtain information about wave
functions and deformation. The interacting boson model with configuration
mixing will be the framework to study the even-even Zr nuclei, considering only
two types of configurations: 0particle-0hole and 2p-2h excitations. On one
hand, the parameters appearing in the Hamiltonian and in the E2 transition
operator are fixed trough a least-squares fit to the whole available
experimental information. On the other hand, once the parameters have been
fixed, the calculations allow to obtain a complete set of observables for the
whole even-even Zr chain of isotopes. Spectra, transition rates, radii,
$\rho^2(E0)$, and two-neutron separation energies have been calculated and a
good agreement with the experimental information has been obtained. Moreover, a
detailed study of the wave function has been conducted and mean-field energy
surfaces and deformation have been computed too. The importance of shape
coexistence has been shown to correctly describe the A~100 mass area for
even-even Zr nuclei. This work confirmed the rather spherical nature of the
ground state of 94-98Zr and its deformed nature for 100-110Zr isotopes. The
sudden onset of deformation in 100Zr is owing to the rapid lowering of a
deformed (intruder) configuration which is high-lying in lighter isotopes.

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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: solv-int