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dc.contributor.authorKesteloot, N.
dc.contributor.authorGarcía Ramos, José Enrique 
dc.contributor.authorZielińska, M.
dc.identifier.citationKesteloot, N., García Ramos, J.E., Zielińska, M... [et. al.]: "Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes". Physical Review C. Vol. 92, n. 5, 054301, (2015). DOI: 10.1103/PhysRevC.92.054301en_US
dc.identifier.issn1089-490X (electrónico)
dc.description.abstractCoulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient Po196,198,200,202 isotopes at the REX-ISOLDE facility. A set of matrix elements, coupling the low-lying states in these isotopes, is extracted. In the two heaviest isotopes, Po200,202, the transitional and diagonal matrix elements of the 2+1 state are determined. In Po196,198 multistep Coulomb excitation is observed, populating the 4+1,0+2, and 2+2 states. The experimental results are compared to the results from the measurement of mean-square charge radii in polonium isotopes, confirming the onset of deformation from Po196 onwards. Three model descriptions are used to compare to the data. Calculations with the beyond-mean-field model, the interacting boson model, and the general Bohr Hamiltonian model show partial agreement with the experimental data. Finally, calculations with a phenomenological two-level mixing model hint at the mixing of a spherical structure with a weakly deformed rotational structure.en_US
dc.description.sponsorshipWe acknowledge the support of the ISOLDE Collaboration and technical teams and, especially, the support of RILIS and REX. This work was supported by FWO-Vlaanderen (Belgium), by GOA/2010/010 (BOF KU Leuven), by the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), by the European Commission within the Seventh Framework Programme through I3-ENSAR (Contract No. RII3-CT-2010-262010), by the German BMBF under Contract Nos. 05P12PKFNE, 06DA9036I 05P12RDCIA, and 05P12RDCIB, by the UK Science and Technology Facilities Council, by the Spanish MINECO under Project No. FIS2011-28738-C02-02, by Narodowe Centrum Nauki (Polish Center for Scientific Research) Grant No. UMO-2013/10/M/ST2/00427, by the Academy of Finland (Contract No. 131665), and by the European Commission through the Marie Curie Actions call PIEFGA-2008-219174 (J.P.).
dc.publisherAmerican Physical Societyen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.titleDeformation and mixing of coexisting shapes in neutron-deficient polonium isotopesen_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/Spanish MINECO [FIS2011-28738-C02-02]
dc.relation.projectIDinfo:eu-repo/grantAgreement/European Commission within the Seventh Framework Programme [I3-ENSAR, RII3-CT-2010-262010]
dc.relation.projectIDinfo:eu-repo/grantAgreement/European Commission through the Marie Curie Actions [PIEFGA-2008-219174]

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