Peter Mohr
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
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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