Speaker
Mr
Stefan Fiebiger
(Goethe University Frankfurt)
Description
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{\small \it Nuclear Physics in Astrophysics 8, NPA8: 18-23 June 2017, Catania, Italy}
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\TITLE{Neutron capture cross sections of Kr}\\[3mm]
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\AUTHORS{S. Fiebiger$^{1}$, B. Baramsai$^{2}$, A. Couture$^{2}$, S. Mosby$^{2}$, J. M. O'Donnell$^{2}$, R. Reifarth$^{1}$, G. Rusev$^{2}$, J. Ullmann$^{2}$, M. Weigand$^{1}$, C. Wolf$^{1}$}
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\AFFILIATION{1}{Goethe University Frankfurt, Germany}
\AFFILIATION{2}{Los Alamos National Laboratory, USA}
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\centerline{Contact email: {\it fiebiger@iap.uni-frankfurt.de}}
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Neutron capture and $\beta^{-}$-decay are competing branches of the s-process nucleosynthesis
path at $^{85}$Kr [1], which makes it an important branching point.
The knowledge of its neutron capture cross section is therefore essential to constrain stellar models of nucleosynthesis.
Despite its importance for different fields, no direct measurement of the cross section of $^{85}$Kr
in the keV-regime has been performed. The currently reported uncertainties are still in
the order of 50\% [2, 3].
Neutron capture cross section measurements on a 4\% enriched $^{85}$Kr gas enclosed in a stainless steel cylinder were performed at Los Alamos National Laboratory (LANL). Using the Detector for Advanced Neutron Capture Experiments (DANCE), a 162 times segmented BaF$_2$ scintillator array. This segmentation combined with a high efficiency allows measurements on small samples of radioactive isotopes.
$^{85}$Kr is radioactive isotope with a half life of 10.8 years. As this was a low-enrichment sample, the main contaminants, the stable krypton isotpes, $^{83}$Kr and $^{86}$Kr were also investigated. The material was highly enchriched and contained in pressurized stainless steel spheres.
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{\small
\noindent [1] C. Abia et al. Astrophysical Journal, 559:1117 (2001);
\noindent [2] R. Raut et al. Cross-Section Measurements of the 86Kr(g,n) Reaction to Probe the s-Process Branching at 85Kr (2013);
\noindent [3] Z. Y. Bao et al. Atomic Data Nucl. Data Tables, 76:70 (2000)
%\noindent [1] E. Stark, Phys. Journal of the North 83 045801 (2011);
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%[2] O. Martell et al. submitted to Solar Physics Letters (2013).}
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Primary author
Mr
Stefan Fiebiger
(Goethe University Frankfurt)
Co-authors
Dr
Aaron Couture
(Los Alamos National Laboratory)
Dr
Bayarbadrakh Baramsai
(Los Alamos National Laboratory)
Mr
Clemens Wolf
(Goethe University Frankfurt)
Dr
Gencho Rusev
(Los Alamos National Laboratory)
Dr
John O'Donnell
(Los Alamos National Laboratory)
Dr
John Ullmann
(Los Alamos National Laboratory)
Dr
Mario Weigand
(Goethe University Frankfurt)
Prof.
Rene Reifarth
(Goethe University Frankfurt)
Dr
Shea Mosby
(Los Alamos National Laboratory)
