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dc.creatorGambacurta, Daniloes
dc.creatorCatara, Francescoes
dc.creatorGrasso, M.es
dc.creatorSambataro, M.es
dc.creatorAndrés Martín, María Victoriaes
dc.creatorLanza, Edoardo G.es
dc.date.accessioned2017-04-03T11:28:21Z
dc.date.available2017-04-03T11:28:21Z
dc.date.issued2016
dc.identifier.citationGambacurta, D., Catara, F., Grasso, M., Sambataro, M., Andrés Martín, M.V. y Lanza, E.G. (2016). Nuclear excitations as coupled one and two random-phase-approximation modes. Physical Review C - Nuclear Physics, 93 (2), 024309.
dc.identifier.issn05562813es
dc.identifier.urihttp://hdl.handle.net/11441/56953
dc.description.abstractWe present an extension of the random-phase approximation (RPA) where the RPA phonons are used as building blocks to construct the excited states. In our model, that we call double RPA (DRPA), we include up to two RPA phonons. This is an approximate and simplified way, with respect to the full second random-phase approximation (SRPA), to extend the RPA by including two-particle–two-hole configurations. Some limitations of the standard SRPA model, related to the violation of the stability condition, are not encountered in the DRPA. We also verify in this work that the energy-weighted sum rules are satisfied. The DRPA is applied to low-energy modes and giant resonances in the nucleus 16 O . We show that the model (i) produces a global downwards shift of the energies with respect to the RPA spectra and (ii) provides a shift that is, however, strongly reduced compared to that generated by the standard SRPA. This model represents an alternative way of correcting for the SRPA anomalous energy shift, compared to a recently developed extension of the SRPA, where a subtraction procedure is applied. The DRPA provides results in good agreement with the experimental energies, with the exception of those low-lying states that have a dominant two-particle–two-hole nature. For describing such states, higher-order calculations are needed.es
dc.description.sponsorshipMinisterio de Economía y Competitividad FIS2013-41994- P FIS2011-28738-c02-01es
dc.description.sponsorshipConsejería de Economía, Innovación, Ciencia y Empleo, Junta de Andalucía FQM-160 P11-FQM-7632es
dc.formatapplication/pdfes
dc.language.isoenges
dc.publisherAmerican Physical Societyes
dc.relation.ispartofPhysical Review C - Nuclear Physics, 93 (2), 024309.
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleNuclear excitations as coupled one and two random-phase-approximation modeses
dc.typeinfo:eu-repo/semantics/articlees
dcterms.identifierhttps://ror.org/03yxnpp24
dc.type.versioninfo:eu-repo/semantics/publishedVersiones
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.contributor.affiliationUniversidad de Sevilla. Departamento de Física Atómica, Molecular y Nucleares
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/FIS2013-41994- Pes
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/FIS2011-28738-c02-01es
dc.relation.projectIDFQM-160es
dc.relation.projectIDP11-FQM-7632es
dc.relation.publisherversion10.1103/PhysRevC.93.024309es
idus.format.extent9 p.es
dc.journaltitlePhysical Review C - Nuclear Physicses
dc.publication.volumen93es
dc.publication.issue2es
dc.publication.initialPage024309-1es
dc.publication.endPage024309-9es
dc.contributor.funderMinisterio de Economía y Competitividad (MINECO). España
dc.contributor.funderJunta de Andalucía

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