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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

Peter Mohr

Christian Heinz

Marco Pignatari

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.

Citation

Mohr, P., Heinz, C., Pignatari, M., Dillmann, I., Mengoni, A., & Käppeler, F. (2016). Re-evaluation of the ¹⁶O(n, γ)¹⁷O cross section at astrophysical energies and its role as a neutron poison in the s-process. The Astrophysical journal, 827(1), Article ARTN 29. https://doi.org/10.3847/0004-637X/827/1/29

Journal Article Type Article
Acceptance Date Apr 29, 2016
Online Publication Date Aug 3, 2016
Publication Date Aug 10, 2016
Deposit Date Aug 5, 2016
Publicly Available Date Aug 5, 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
Public URL https://hull-repository.worktribe.com/output/442060
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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