Measurement of the stellar $^{58}$Ni$(n,γ)^{59}$Ni cross section with AMS
Peter Ludwig, Georg Rugel, Iris Dillmann, Thomas Faestermann, Leticia Fimiani, Karin Hain, Gunther Korschinek, Johannes Lachner, Mikhail Poutivtsev, Klaus Knie,… 展开作者
Peter Ludwig, Georg Rugel, Iris Dillmann, Thomas Faestermann, Leticia Fimiani, Karin Hain, Gunther Korschinek, Johannes Lachner, Mikhail Poutivtsev, Klaus Knie, Michael Heil, Franz Käppeler, Anton Wallner
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13 pages, 4 figures; accepted for publication in Phys. Rev. C (2017)
The $^{58}$Ni$(n,γ)^{59}$Ni cross section was measured with a combination of the activation technique and accelerator mass spectrometry (AMS). The neutron activations were performed at the Karlsruhe 3.7 MV Van de Graaff accelerator using the quasi-stellar neutron spectrum at $kT=25$ keV produced by the $^7$Li($p,n$)$^7$Be reaction. The subsequent AMS measurements were carried out at the 14 MV tandem accelerator of the Maier-Leibnitz-Laboratory in Garching using the Gas-filled Analyzing Magnet System (GAMS). Three individual samples were measured, yielding a Maxwellian-averaged cross section at $kT=30$ keV of $\langleσ\rangle_{30\text{keV}}$= 30.4 (23)$^{syst}$(9)$^{stat}$ mbarn. This value is slightly lower than two recently published measurements using the time-of-flight (TOF) method, but agrees within the uncertainties. Our new results also resolve the large discrepancy between older TOF measurements and our previous value.
Formalism for inclusion of measured reaction cross sections in stellar rates including uncertainties and its application to neutron capture in the s-process
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