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dc.contributor.authorGlorius, J.
dc.contributor.authorSonnabend, K.
dc.contributor.authorGörres, J.
dc.contributor.authorRobertson, D.
dc.contributor.authorKnörzer, M.
dc.contributor.authorKontos, A.
dc.contributor.authorRauscher, T.
dc.contributor.authorReifarth, R.
dc.contributor.authorSauerwein, A.
dc.contributor.authorStech, E.
dc.contributor.authorTan, W.
dc.contributor.authorThomas, T.
dc.contributor.authorWiescher, M.
dc.date.accessioned2014-07-21T07:30:14Z
dc.date.available2014-07-21T07:30:14Z
dc.date.issued2014-06-30
dc.identifier.citationGlorius , J , Sonnabend , K , Görres , J , Robertson , D , Knörzer , M , Kontos , A , Rauscher , T , Reifarth , R , Sauerwein , A , Stech , E , Tan , W , Thomas , T & Wiescher , M 2014 , ' Experimental cross sections of Ho 165 (α,n) Tm 168 and Er 166 (α,n) Yb 169 for optical potential studies relevant for the astrophysical γ process ' , Physical Review C , vol. 89 , no. 6 , 065808 . https://doi.org/10.1103/PhysRevC.89.065808
dc.identifier.issn2469-9985
dc.identifier.otherPURE: 7232412
dc.identifier.otherPURE UUID: 7073b41e-11cf-4483-a3f5-b9fc30d77b70
dc.identifier.otherRIS: urn:F853A65EC123B26D2E7A29AC8FD53F39
dc.identifier.otherScopus: 84903589683
dc.identifier.urihttp://hdl.handle.net/2299/13963
dc.description.abstractBackground: Optical potentials are crucial ingredients for the prediction of nuclear reaction rates needed in simulations of the astrophysical γ process. Associated uncertainties are particularly large for reactions involving α particles. This includes (γ,α) reactions which are of special importance in the γ process. Purpose: The measurement of (α,n) reactions allows for an optimization of currently used α-nucleus potentials. The reactions Ho165(α,n) and Er166(α,n) probe the optical model in a mass region where γ process calculations exhibit an underproduction of p nuclei which is not yet understood. Method: To investigate the energy-dependent cross sections of the reactions Ho165(α,n) and Er166(α,n) close to the reaction threshold, self-supporting metallic foils were irradiated with α particles using the FN tandem Van de Graaff accelerator at the University of Notre Dame. The induced activity was determined afterwards by monitoring the specific β-decay channels. Results: Hauser-Feshbach predictions with a widely used global α potential describe the data well at energies where the cross sections are almost exclusively sensitive to the α widths. Increasing discrepancies appear towards the reaction threshold at lower energy. Conclusions: The tested global α potential is suitable at energies above 14 MeV, while a modification seems necessary close to the reaction threshold. Since the γ and neutron widths show non-negligible impact on the predictions, complementary data are required to judge whether or not the discrepancies found can be solely assigned to the α width. © 2014 American Physical Society.en
dc.format.extent8
dc.language.isoeng
dc.relation.ispartofPhysical Review C
dc.rightsOpen
dc.titleExperimental cross sections of Ho 165 (α,n) Tm 168 and Er 166 (α,n) Yb 169 for optical potential studies relevant for the astrophysical γ processen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2014-06-30
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1103/PhysRevC.89.065808
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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