@misc{10272/19013,
year = {2019},
month = {10},
url = {http://hdl.handle.net/10272/19013},
abstract = {The mass region with A approx 100 and Z approx 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 2particle-2hole 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, rho2(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 approx 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.},
organization = {This work was supported by the InterUniversity Attraction Poles Program of the Belgian State-Federal Office for Scientific, Technical and Cultural Affairs (IAP Grant  P7/12) and it has also been partially supported by the Consejería de Economía, Conocimiento, Empresas y Universidad de la Junta de Andalucía (Spain) under Group FQM-370, by Centro de Estudios Avanzados en Física, Matemática y Computación of the  University of Huelva, and by Instituto Carlos I de Física Teórica y Computación of the University of Granada.},
publisher = {American Physical Society (postprint)},
title = {Quest of shape coexistence in Zr isotopes},
doi = {10.1103/PhysRevC.100.044315},
author = {García Ramos, José Enrique and Heyde, K.},
}