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dc.contributor.authorHeil, M.
dc.contributor.authorWinckler, N.
dc.contributor.authorDababneh, S.
dc.contributor.authorKaeppeler, F.
dc.contributor.authorWisshak, K.
dc.contributor.authorBisterzo, S.
dc.contributor.authorGallino, R.
dc.contributor.authorDavis, A. M.
dc.contributor.authorRauscher, T.
dc.date.accessioned2013-04-12T11:19:04Z
dc.date.available2013-04-12T11:19:04Z
dc.date.issued2008-01-20
dc.identifier.citationHeil , M , Winckler , N , Dababneh , S , Kaeppeler , F , Wisshak , K , Bisterzo , S , Gallino , R , Davis , A M & Rauscher , T 2008 , ' 176 Lu/ 176 Hf : A sensitive test of s-process temperature and neutron density in AGB stars ' , The Astrophysical Journal , vol. 673 , no. 1 , pp. 434-444 . https://doi.org/10.1086/523892
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 1622008
dc.identifier.otherPURE UUID: 06dfa801-f0b3-407e-8ff5-f1374c224056
dc.identifier.otherWOS: 000253454200033
dc.identifier.otherScopus: 40249095945
dc.identifier.urihttp://hdl.handle.net/2299/10393
dc.descriptionFull text of this article is freely available on the journal website
dc.description.abstractThe s-process branching at A (176) has been analyzed on the basis of significantly improved experimental cross sections. This work reports on activation measurements of the partial (n, gamma) cross section of Lu-176 feeding the isomeric state in Lu-176. In total, six irradiations were performed at the Karlsruhe 3.7 MV pulsed Van de Graaff accelerator, and the induced activities were measured with HPGe clover detectors. In combination with previous data, partial cross sections of 3185 +/- 156 and 1153 +/- 30 mbarn were deduced at kT = 5: 1 and 25 keV, respectively. With these results and a recent time-of-flight measurement of the total stellar (n, gamma) cross section, the isomeric ratio was found to be constant in the relevant thermal energy range of the main s-process component. Based on these new data, a comprehensive analysis of the branching at Lu-176 was carried out for testing the temperature and neutron density conditions during He shell flashes in thermally pulsing low-mass asymptotic giant branch stars. It was found that the long-standing problem of the mother/daughter ratio of the two s-only isotopes Lu-176 and Hf-176 could be solved, if the temperature-dependent beta-decay half- life of Lu-176 was considered with sufficient resolution over the temperature profile of the convective He shell flashes.en
dc.format.extent11
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectPROCESS NUCLEOSYNTHESIS
dc.subjectCAPTURE CROSS-SECTIONS
dc.subjectASTROPHYSICAL CONSEQUENCES
dc.subjectSOLAR
dc.subjectSYSTEM
dc.subjectnuclear reactions, nucleosynthesis, abundances
dc.subjectGIANT BRANCH STARS
dc.subjectCOSMIC CLOCK
dc.subjectstars : AGB and post-AGB
dc.subjectstars : interiors
dc.subjectLU-176
dc.subjectABUNDANCES
dc.subjectEVOLUTION
dc.title176Lu/176Hf : A sensitive test of s-process temperature and neutron density in AGB starsen
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/10.1086/523892
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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