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Re-evaluation of the ¹⁶O(n, γ)¹⁷O cross section at astrophysical energies and its role as a neutron poison in the s-process

Mohr, Peter; Heinz, Christian; Pignatari, Marco; Dillmann, Iris; Mengoni, Alberto; Käppeler, Franz

Authors

Franz Kaeppeler

Peter Mohr

Christian Heinz

Iris Dillmann

Alberto Mengoni

Franz Käppeler

Abstract

The doubly magic nucleus ¹⁶O has a small neutron-capture cross section of just a few tens of microbarns in the astrophysical energy region. Despite this, ¹⁶O plays an important role as a neutron poison in the astrophysical slow neutron capture (s) process due to its high abundance. We present in this paper a re-evaluation of the available experimental data for ¹⁶O(n, γ)¹⁷O and derive a new recommendation for the Maxwellian-averaged cross sections between kT = 5 and 100 keV. Our new recommendations are lower up to kT = 60 keV compared to the previously recommended values but up to 14% higher at kT = 100 keV. We explore the impact of this different energy dependence on the weak s-process during core helium burning (kT = 26 keV) and shell carbon burning (kT = 90 keV) in massive stars where ¹⁶O is the most abundant isotope.

Journal Article Type Article
Publication Date Aug 10, 2016
Journal Astrophysical journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 827
Issue 1
Article Number ARTN 29
DOI https://doi.org/10.3847/0004-637x/827/1/29
Keywords ¹⁶O(n, γ)¹⁷O cross section , Stars: massive, s-process
Publisher URL http://iopscience.iop.org/article/10.3847/0004-637X/827/1/29/meta;jsessionid=9DD4B9611E3BDFCE2CCFB67382448C44.c1.iopscience.cld.iop.org
Additional Information Journal title: The Astrophysical Journal; Article type: paper; Article title: RE-EVALUATION OF THE16O(N,γ)17O CROSS SECTION AT ASTROPHYSICAL ENERGIES AND ITS ROLE AS A NEUTRON POISON IN THEs-PROCESS; Copyright information: © 2016. The American Astronomical Society. All rights reserved.; Date received: 2016-02-11; Date accepted: 2016-04-29; Online publication date: 2016-08-03

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Copyright Statement
© 2016. The American Astronomical Society. All rights reserved.


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