First measurements of the total and partial stellar cross section to the $s$-process branching-point $^{79}$Se

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dc.creatorDillmann, I.
dc.creatorHeil, M.
dc.creatorKäppeler, F.
dc.creatorFaestermann, T.
dc.creatorKnie, K.
dc.creatorKorschinek, G.
dc.creatorPoutivtsev, M.
dc.creatorRugel, G.
dc.creatorWallner, A.
dc.creatorRauscher, T.
dc.date2008-06-12
dc.date.accessioned2026-07-07T09:44:12Z
dc.date.available2026-07-07T09:44:12Z
dc.descriptionAlthough $^{79}$Se represents an important branching in the weak s process, the stellar neutron capture cross sections to this isotope have not yet been measured experimentally. In this case, experimental data is essential for evaluating the important branching in the s-process reaction path at $^{79}$Se. The total cross section of $^{78}$Se at a stellar energy of kT = 25 keV has been investigated with a combination of the activation technique and accelerator mass spectrometry (AMS), since offline decay counting is prohibitive due to the long terrestrial half life of $^{79}$Se (2.80$\pm$0.36 $\times10^5$ y) as well as the absence of suitable $γ$-ray transitions. The preliminary result for the total Maxwellian averaged cross section is $<σ>_{30 keV}$= 60.1$\pm$9.6 mbarn, significantly lower than the previous recommended value. In a second measurement, also the partial cross section to the 3.92 min-isomer was determined via $γ$-spectroscopy and yielded $<σ>_{30 keV}$(part.)= 42.0$\pm$2.0 mbarn.
dc.descriptionProceedings "Nuclei in the Cosmos" NIC- IX, June 25-30 2006, CERN, Geneva/ Switzerland, published with Proccedings of Science, PoS(NIC-IX)089
dc.identifierhttps://arxiv.org/abs/0806.2063
dc.identifierhttp://arxiv.org/abs/0806.2063
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/162785
dc.subjectAstrophysics
dc.subjectNuclear Experiment
dc.titleFirst measurements of the total and partial stellar cross section to the $s$-process branching-point $^{79}$Se
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