Low-energy dipole strength in Sn-112,Sn-120

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dc.authorid0000-0002-8441-378X
dc.authorid0000-0002-0256-5940
dc.authorid0000-0001-7563-1518
dc.authorid0000-0003-2115-8926
dc.contributor.authorOezel-Tashenov, B.
dc.contributor.authorEnders, J.
dc.contributor.authorLenske, H.
dc.contributor.authorKrumbholz, A. M.
dc.contributor.authorLitvinova, E.
dc.contributor.authorvon Neumann-Cosel, P.
dc.contributor.authorTsoneva, N.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2014
dc.departmentNiğde ÖHÜ
dc.description.abstractThe Sn-112,Sn-120(gamma, gamma') reactions below the neutron separation energies have been studied at the superconducting Darmstadt electron linear accelerator S-DALINAC for different endpoint energies of the incident bremsstrahlung spectrum. Dipole strength distributions are extracted for Sn-112 up to 9.5 MeV and for Sn-120 up to 9.1 MeV. A concentration of dipole excitations is observed between 5 and 8 MeV in both nuclei. Missing strength due to unobserved decays to excited states is estimated in a statistical model. A fluctuation analysis is applied to the photon scattering spectra to extract the amount of the unresolved strength hidden in the background due to fragmentation. The strength distributions are discussed within different model approaches such as the quasiparticle-phonon model and the relativistic time blocking approximation, allowing for an inclusion of complex configurations beyond the initial particle-hole states. While a satisfactory description of the fragmentation can be achieved for sufficiently large model spaces, the predicted centroids and total electric dipole strengths for stable tin isotopes strongly depend on the assumptions about the underlying mean field.
dc.description.sponsorshipDAAD; DFG [SFB 634]; Alliance Program of the Helmholtz Association [HA216/EMMI]; BMBF [06GI9109]; US-NSF [PHY-1204486]; National Superconducting Cyclotron Laboratory at Michigan State University
dc.description.sponsorshipR. Eichhorn and the S-DALINAC crew are thanked for their effort in providing excellent beams and the GSI for the loan of the enriched <SUP>112</SUP>Sn target. We are grateful to V. Yu. Ponomarev for providing us with the results of his calculations and for important discussions. We are indebted to F. Siebenhuhner for his contribution to the analysis of the data. B.O-T. acknowledges financial support from the DAAD sandwich program during her stay in Germany. This work was supported by the DFG under Contract No. SFB 634, by the Alliance Program of the Helmholtz Association (HA216/EMMI), by BMBF Project No. 06GI9109, and by US-NSF Grant No. PHY-1204486 and the National Superconducting Cyclotron Laboratory at Michigan State University.
dc.identifier.doi10.1103/PhysRevC.90.024304
dc.identifier.issn2469-9985
dc.identifier.issn2469-9993
dc.identifier.issue2
dc.identifier.scopus2-s2.0-84920642112
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://dx.doi.org/10.1103/PhysRevC.90.024304
dc.identifier.urihttps://hdl.handle.net/11480/4140
dc.identifier.volume90
dc.identifier.wosWOS:000341166100003
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherAMER PHYSICAL SOC
dc.relation.ispartofPHYSICAL REVIEW C
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.titleLow-energy dipole strength in Sn-112,Sn-120
dc.typeArticle

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