The impact of (n, γ ) reaction rate uncertainties of unstable isotopes near N = 50 on the i-process nucleosynthesis in He-shell flash white dwarfs

Denissenkov, Pavel; Perdikakis, Georgios; Herwig, Falk; Schatz, Hendrik; Ritter, Christian; Pignatari, Marco; Jones, Samuel; Nikas, Stylianos; Spyrou, Artemis

doi:10.1088/1361-6471/aabb6e

Title: The impact of (n, γ ) reaction rate uncertainties of unstable isotopes near N = 50 on the i-process nucleosynthesis in He-shell flash white dwarfs

Journal Article · Mon Apr 16 00:00:00 EDT 2018 · Journal of Physics. G, Nuclear and Particle Physics

DOI:https://doi.org/10.1088/1361-6471/aabb6e· OSTI ID:1492608

^[1]; Perdikakis, Georgios ^[2];

^[1]; Schatz, Hendrik ^[3]; Ritter, Christian ^[1];

^[4];

^[5]; Nikas, Stylianos ^[6]; Spyrou, Artemis ^[3]

Univ. of Victoria, BC (Canada). Dept. of Physics & Astronomy; Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics, Center for the Evolution of the Elements
Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics, Center for the Evolution of the Elements; Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics and Physical Sciences Program; Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics, Center for the Evolution of the Elements; Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Michigan State Univ., East Lansing, MI (United States). Dept. of Physics & Astronomy
Univ. of Hull, Hull (United Kingdom). E.A. Milne Centre for Astrophysics, Dept. of Physics & Mathematics; Hungarian Academy of Sciences, Budapest (Hungary). Konkoly Observatory, Research Centre for Astronomy and Earth Sciences
Heidelberg Inst. for Theoretical Studies, Heidelberg, (Germany); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics, Center for the Evolution of the Elements; Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics and Physical Sciences Program

The first-peak s-process elements Rb, Sr, Y and Zr in the post-AGB star Sakurai's object (V4334 Sagittarii) have been proposed to be the result of i-process nucleosynthesis in a post-AGB very-late thermal pulse event. We estimate the nuclear physics uncertainties in the i-process model predictions to determine whether the remaining discrepancies with observations are significant and point to potential issues with the underlying astrophysical model. We find that the dominant source in the nuclear physics uncertainties are predictions of neutron capture rates on unstable neutron rich nuclei, which can have uncertainties of more than a factor 20 in the band of the i-process. We use a Monte Carlo variation of 52 neutron capture rates and a 1D multi-zone post-processing model for the i-process in Sakurai's object to determine the cumulative effect of these uncertainties on the final elemental abundance predictions. We find that the nuclear physics uncertainties are large and comparable to observational errors. Within these uncertainties the model predictions are consistent with observations. A correlation analysis of the results of our MC simulations reveals that the strongest impact on the predicted abundances of Rb, Sr, Y and Zr is made by the uncertainties in the (n, γ) reaction rates of ⁸⁵Br, ⁸⁶Br, ⁸⁷Kr, ⁸⁸Kr, ⁸⁹Kr, ⁸⁹Rb, ⁸⁹Sr, and ⁹²Sr. This conclusion is supported by a series of multi-zone simulations in which we increased and decreased to their maximum and minimum limits one or two reaction rates per run. We also show that simple and fast one-zone simulations should not be used instead of more realistic multi-zone stellar simulations for nuclear sensitivity and uncertainty studies of convective–reactive processes. Lastly, our findings apply more generally to any i-process site with similar neutron exposure, such as rapidly accreting white dwarfs with near-solar metallicities.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Science Foundation (NSF)

Contributing Organization:: NuGrid Collaboration

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1492608

Report Number(s):: LA-UR-18-21509

Journal Information:: Journal of Physics. G, Nuclear and Particle Physics, Vol. 45, Issue 5; ISSN 0954-3899

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Convective-reactive proton-C12 combustion in Sakurai's object (V4334 Sagittarii) and implications for the evolution and yields from the first generations of stars Herwig, Falk; Pignatari, Marco; Woodward, Paul R. arXiv https://doi.org/10.48550/arxiv.1002.2241	text	January 2010
Evolution and nucleosynthesis of extremely metal-poor and metal-free low- and intermediate-mass stars II. s-process nucleosynthesis during the core He flash Campbell, Simon W.; Lugaro, Maria; Karakas, Amanda I. arXiv https://doi.org/10.48550/arxiv.1010.1987	text	January 2010
Evidence for Radiogenic Sulfur-32 in Type AB Presolar Silicon Carbide Grains? Fujiya, Wataru; Hoppe, Peter; Zinner, Ernst arXiv https://doi.org/10.48550/arxiv.1310.0485	text	January 2013
New insights on Ba over-abundance in open clusters. Evidence for the intermediate neutron-capture process at play? Mishenina, T.; Pignatari, M.; Carraro, G. arXiv https://doi.org/10.48550/arxiv.1411.1422	text	January 2014
The intermediate neutron-capture process and carbon-enhanced metal-poor stars Hampel, Melanie; Stancliffe, Richard J.; Lugaro, Maria arXiv https://doi.org/10.48550/arxiv.1608.08634	text	January 2016
i-Process Contribution of Rapidly Accreting White Dwarfs to the Solar Composition of First-Peak Neutron-Capture Elements Côté, Benoit; Denissenkov, Pavel; Herwig, Falk arXiv https://doi.org/10.48550/arxiv.1712.07551	text	January 2017
Nuclear Reaction Rate Uncertainties and Astrophysical Modeling. II. Carbon Yields from Low-mass Giants Herwig, F.; Austin, Sam M.; Lattanzio, John C. arXiv https://doi.org/10.48550/arxiv.astro-ph/0511386	text	January 2005
Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section Goriely, S.; Khan, E. arXiv https://doi.org/10.48550/arxiv.nucl-th/0203074	text	January 2002
Microscopic HFB+QRPA predictions of dipole strength for astrophysics applications Goriely, S.; Khan, E.; Samyn, M. arXiv https://doi.org/10.48550/arxiv.nucl-th/0306005	text	January 2003
Uncertainties in the production of p nuclei in massive stars obtained from Monte Carlo variations Rauscher, T.; Nishimura, N.; Hirschi, R. Oxford University Press https://doi.org/10.5451/unibas-ep53882	text	January 2016

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Neutron Star Mergers Might Not Be the Only Source of r -process Elements in the Milky Way Côté, Benoit; Eichler, Marius; Arcones, Almudena The Astrophysical Journal, Vol. 875, Issue 2 https://doi.org/10.3847/1538-4357/ab10db	journal	April 2019
Remnants and ejecta of thermonuclear electron-capture supernovae: Constraining oxygen-neon deflagrations in high-density white dwarfs Jones, S.; Röpke, F. K.; Fryer, C. Astronomy & Astrophysics, Vol. 622 https://doi.org/10.1051/0004-6361/201834381	journal	January 2019
The impact of (n,γ) reaction rate uncertainties on the predicted abundances of i-process elements with 32 ≤ Z ≤ 48 in the metal-poor star HD94028 McKay, John E.; Denissenkov, Pavel A.; Herwig, Falk Monthly Notices of the Royal Astronomical Society, Vol. 491, Issue 4 https://doi.org/10.1093/mnras/stz3322	journal	December 2019
Learning about the Intermediate Neutron-capture Process from Lead Abundances Hampel, Melanie; Karakas, Amanda I.; Stancliffe, Richard J. The Astrophysical Journal, Vol. 887, Issue 1 https://doi.org/10.3847/1538-4357/ab4fe8	journal	December 2019
The i-process yields of rapidly-accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parameterizations from 3D hydrodynamics simulations Denissenkov, Pavel; Herwig, Falk; Woodward, Paul arXiv https://doi.org/10.48550/arxiv.1809.03666	text	January 2018
Remnants and ejecta of thermonuclear electron-capture supernovae: Constraining oxygen-neon deflagrations in high-density white dwarfs Jones, S.; Roepke, F. K.; Fryer, C. arXiv https://doi.org/10.48550/arxiv.1812.08230	text	January 2018

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