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dc.contributor.authorGuber, K. H.
dc.contributor.authorKoehler, P. E.
dc.contributor.authorDerrien, H.
dc.contributor.authorValentine, T.E.
dc.contributor.authorLeal, L.C.
dc.contributor.authorSayer, R.O.
dc.contributor.authorRauscher, T.
dc.date.accessioned2013-07-02T12:17:06Z
dc.date.available2013-07-02T12:17:06Z
dc.date.issued2003-06
dc.identifier.citationGuber , K H , Koehler , P E , Derrien , H , Valentine , T E , Leal , L C , Sayer , R O & Rauscher , T 2003 , ' Neutron capture reaction rates for silicon and their impact on the origin of presolar mainstream SiC grains ' , Physical Review C , vol. 67 , no. 6 , 062802 . https://doi.org/10.1103/PhysRevC.67.062802
dc.identifier.issn2469-9985
dc.identifier.otherPURE: 1631571
dc.identifier.otherPURE UUID: e97d9921-0f6e-48b4-b60e-fcd02e776584
dc.identifier.otherWOS: 000183878900008
dc.identifier.otherScopus: 0042330061
dc.identifier.urihttp://hdl.handle.net/2299/11010
dc.description.abstractWe have made new, improved measurements of the Si28-30 (n, gamma) cross sections and have done a resonance analysis of these data including previous total cross sections. Together with the calculated contributions due to direct capture, we calculated the astrophysical (n, gamma) reaction rates and investigated the s-process abundances of the Si isotopes. Measured isotopic anomalies of intermediate and heavy elements in SiC grains from meteorites appear to be attributable to the s-process in asymptotic giant branch (AGB) stars. But the Si isotopic ratios in these grains are substantially different than s-process models predict. Therefore, recent papers have invoked galactic chemical evolution or other effects to explain the Si isotope ratios in these grains. Our new reaction rates are significantly different than previous rates, and s-process calculations using these rates lead to much larger isotopic shifts in Si-30. However, these exploratory calculations demonstrate that even with these substantially different rates the large observed variation in SiC grain from AGB stars cannot be explained by standard s-process models.en
dc.format.extent5
dc.language.isoeng
dc.relation.ispartofPhysical Review C
dc.subjectCARBON
dc.subjectANOMALIES
dc.subjectCROSS-SECTIONS
dc.subjectNUCLEOSYNTHESIS
dc.subjectMURCHISON METEORITE
dc.subjectEVOLUTION
dc.subjectCHONDRITE
dc.subjectND
dc.subjectCARBIDE GRAINS
dc.subjectSOLAR-SYSTEM FORMATION
dc.titleNeutron capture reaction rates for silicon and their impact on the origin of presolar mainstream SiC grainsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionofrecordhttps://doi.org/10.1103/PhysRevC.67.062802
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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