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dc.contributor.authorYalçIn, C.
dc.contributor.authorGyürky, Gy
dc.contributor.authorRauscher, T.
dc.contributor.authorKiss, G. G.
dc.contributor.authorÖzkan, N.
dc.contributor.authorGüray, R. T.
dc.contributor.authorHalász, Z.
dc.contributor.authorSzücs, T.
dc.contributor.authorFülöp, Zs
dc.contributor.authorFarkas, J.
dc.contributor.authorKorkulu, Z.
dc.contributor.authorSomorjai, E.
dc.date.accessioned2015-04-13T07:33:58Z
dc.date.available2015-04-13T07:33:58Z
dc.date.issued2015-03-16
dc.identifier.citationYalçIn , C , Gyürky , G , Rauscher , T , Kiss , G G , Özkan , N , Güray , R T , Halász , Z , Szücs , T , Fülöp , Z , Farkas , J , Korkulu , Z & Somorjai , E 2015 , ' Test of statistical model cross section calculations for α -induced reactions on Ag 107 at energies of astrophysical interest ' , Physical Review C , vol. 91 , no. 3 , 034610 . https://doi.org/10.1103/PhysRevC.91.034610
dc.identifier.issn2469-9985
dc.identifier.otherPURE: 8369890
dc.identifier.otherPURE UUID: 434a5d2d-147f-4c20-b12e-55174649e17a
dc.identifier.otherScopus: 84925655327
dc.identifier.urihttp://hdl.handle.net/2299/15750
dc.description.abstractBackground: Astrophysical reaction rates, which are mostly derived from theoretical cross sections, are necessary input to nuclear reaction network simulations for studying the origin of p nuclei. Past experiments have found a considerable difference between theoretical and experimental cross sections in some cases, especially for (α,γ) reactions at low energy. Therefore, it is important to experimentally test theoretical cross section predictions at low, astrophysically relevant energies. Purpose: The aim is to measure reaction cross sections of Ag107(α,γ)In111 and Ag107(α,n)In110 at low energies in order to extend the experimental database for astrophysical reactions involving α particles towards lower mass numbers. Reaction rate predictions are very sensitive to the optical model parameters and this introduces a large uncertainty into theoretical rates involving α particles at low energy. We have also used Hauser-Feshbach statistical model calculations to study the origin of possible discrepancies between prediction and data. Method: An activation technique has been used to measure the reaction cross sections at effective center of mass energies between 7.79 MeV and 12.50 MeV. Isomeric and ground state cross sections of the (α,n) reaction were determined separately. Results: The measured cross sections were found to be lower than theoretical predictions for the (α,γ) reaction. Varying the calculated averaged widths in the Hauser-Feshbach model, it became evident that the data for the (α,γ) and (α,n) reactions can only be simultaneously reproduced when rescaling the ratio of γ to neutron width and using an energy-dependent imaginary part in the optical α+Ag107 potential. Conclusions: The new data extend the range of measured charged-particle cross sections for astrophysical applications to lower mass numbers and lower energies. The modifications in the model predictions required to reproduce the present data are fully consistent with what was found in previous investigations. Thus, our results confirm the previously suggested energy-dependent modification of the optical α+nucleus potential.en
dc.format.extent7
dc.language.isoeng
dc.relation.ispartofPhysical Review C
dc.rightsOpen
dc.subjectNuclear and High Energy Physics
dc.titleTest of statistical model cross section calculations for α -induced reactions on Ag 107 at energies of astrophysical interesten
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.description.statusPeer reviewed
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2015-03-16
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1103/PhysRevC.91.034610
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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