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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

Abstract

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 ratesmore » 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.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [3];  [1]; ORCiD logo [4]; ORCiD logo [5];  [6];  [3]
  1. 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
  2. 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.
  3. 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
  4. 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
  5. Heidelberg Inst. for Theoretical Studies, Heidelberg, (Germany); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. 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
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Science Foundation (NSF)
Contributing Org.:
NuGrid Collaboration
OSTI Identifier:
1492608
Report Number(s):
LA-UR-18-21509
Journal ID: ISSN 0954-3899
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. G, Nuclear and Particle Physics
Additional Journal Information:
Journal Volume: 45; Journal Issue: 5; Journal ID: ISSN 0954-3899
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; nuclear reactions; nucleosynthesis; stars: abundances; stars: AGB and post-AGB

Citation Formats

Denissenkov, Pavel, Perdikakis, Georgios, Herwig, Falk, Schatz, Hendrik, Ritter, Christian, Pignatari, Marco, Jones, Samuel, Nikas, Stylianos, and Spyrou, Artemis. 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. United States: N. p., 2018. Web. https://doi.org/10.1088/1361-6471/aabb6e.
Denissenkov, Pavel, Perdikakis, Georgios, Herwig, Falk, Schatz, Hendrik, Ritter, Christian, Pignatari, Marco, Jones, Samuel, Nikas, Stylianos, & Spyrou, Artemis. 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. United States. https://doi.org/10.1088/1361-6471/aabb6e
Denissenkov, Pavel, Perdikakis, Georgios, Herwig, Falk, Schatz, Hendrik, Ritter, Christian, Pignatari, Marco, Jones, Samuel, Nikas, Stylianos, and Spyrou, Artemis. Mon . "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". United States. https://doi.org/10.1088/1361-6471/aabb6e. https://www.osti.gov/servlets/purl/1492608.
@article{osti_1492608,
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},
author = {Denissenkov, Pavel and Perdikakis, Georgios and Herwig, Falk and Schatz, Hendrik and Ritter, Christian and Pignatari, Marco and Jones, Samuel and Nikas, Stylianos and Spyrou, Artemis},
abstractNote = {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.},
doi = {10.1088/1361-6471/aabb6e},
journal = {Journal of Physics. G, Nuclear and Particle Physics},
number = 5,
volume = 45,
place = {United States},
year = {2018},
month = {4}
}

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New measurement of neutron capture resonances in Bi 209
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Resonance capture cross section of Pb 207
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journal, September 1998


Improved microscopic nuclear level densities within the Hartree-Fock-Bogoliubov plus combinatorial method
journal, December 2008


Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section
journal, July 2002


Neutron capture reaction rates for silicon and their impact on the origin of presolar mainstream SiC grains
journal, June 2003


New Maxwellian averaged neutron capture cross sections for 3 5 , 3 7 Cl
journal, April 2002


The Intermediate Neutron-Capture Process and Carbon-Enhanced Metal-Poor Stars
journal, November 2016


Neutron Capture Cross Sections for the Weak s Process
journal, January 2009

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Stellar ( n , γ ) cross sections for Br and Rb: Matching the weak and main s -process components
journal, August 2008


Neutron capture cross sections for the weak s process in massive stars
journal, January 2008


Nuclear reaction rate uncertainties and astrophysical modeling: Carbon yields from low-mass giants
journal, February 2006


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journal, August 2014


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journal, October 2013


Microscopic calculation of the symmetry and Coulomb components of the complex optical-model potential
journal, January 1977


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journal, April 2011


Local and global nucleon optical models from 1 keV to 200 MeV
journal, January 2003


Test of gamma-ray strength functions in nuclear reaction model calculations
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Neutron Capture Cross Section of Unstable Ni 63 : Implications for Stellar Nucleosynthesis
journal, January 2013


Ni 62 ( n , γ ) and Ni 63 ( n , γ ) cross sections measured at the n_TOF facility at CERN
journal, February 2014


Experimental Neutron Capture Rate Constraint Far from Stability
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BARIUM ISOTOPIC COMPOSITION OF MAINSTREAM SILICON CARBIDES FROM MURCHISON: CONSTRAINTS FOR s -PROCESS NUCLEOSYNTHESIS IN ASYMPTOTIC GIANT BRANCH STARS
journal, April 2014


THE s -PROCESS IN ASYMPTOTIC GIANT BRANCH STARS OF LOW METALLICITY AND THE COMPOSITION OF CARBON-ENHANCED METAL-POOR STARS
journal, February 2012

  • Lugaro, Maria; Karakas, Amanda I.; Stancliffe, Richard J.
  • The Astrophysical Journal, Vol. 747, Issue 1
  • DOI: 10.1088/0004-637X/747/1/2

THE IMPACT OF UPDATED Zr NEUTRON-CAPTURE CROSS SECTIONS AND NEW ASYMPTOTIC GIANT BRANCH MODELS ON OUR UNDERSTANDING OF THE S PROCESS AND THE ORIGIN OF STARDUST
journal, December 2013

  • Lugaro, Maria; Tagliente, Giuseppe; Karakas, Amanda I.
  • The Astrophysical Journal, Vol. 780, Issue 1
  • DOI: 10.1088/0004-637X/780/1/95

Neutron capture cross sections of W 184 and W 186
journal, August 2009


Neutron capture cross sections of Ge 74 , Ge 76 , and As 75 at 25 keV
journal, June 2009


Stellar ( n , γ ) cross sections of p -process isotopes. II. Yb 168 , W 180 , Os 184 , Pt 190 , and Hg 196
journal, September 2010


Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications
journal, April 2012


s -process branching at W 185 revised
journal, March 2004


Measurement of the H 2 ( n , γ ) H 3 reaction cross section between 10 and 550 keV
journal, August 2006


The C 14 ( n , γ ) cross section between 10 keV and 1 MeV
journal, January 2008


THE DIVERSE ORIGINS OF NEUTRON-CAPTURE ELEMENTS IN THE METAL-POOR STAR HD 94028: POSSIBLE DETECTION OF PRODUCTS OF i -PROCESS NUCLEOSYNTHESIS
journal, April 2016

  • Roederer, Ian U.; Karakas, Amanda I.; Pignatari, Marco
  • The Astrophysical Journal, Vol. 821, Issue 1
  • DOI: 10.3847/0004-637X/821/1/37

Three-Dimensional Hydrodynamical Simulations of a Proton Ingestion Episode in a Low-Metallicity Asymptotic Giant Branch star
journal, November 2011

  • Stancliffe, Richard J.; Dearborn, David S. P.; Lattanzio, John C.
  • The Astrophysical Journal, Vol. 742, Issue 2
  • DOI: 10.1088/0004-637X/742/2/121

New measurements of the F 19 ( n , γ ) F 20 cross section and their implications for the stellar reaction rate
journal, March 2007


Measurement of the Fe 60 ( n , γ ) 61 Fe Cross Section at Stellar Temperatures
journal, April 2009


Stellar ( n , γ ) cross sections of Hf 174 and radioactive Hf 182
journal, January 2007


Experimental neutron capture data of 58 Ni from the CERN n_TOF facility
journal, January 2014


    Works referencing / citing this record:

    The i-process yields of rapidly accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parametrizations from 3D hydrodynamics simulations
    journal, July 2019

    • Denissenkov, Pavel A.; Herwig, Falk; Woodward, Paul
    • Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 3
    • DOI: 10.1093/mnras/stz1921

    Neutron Star Mergers Might Not Be the Only Source of r -process Elements in the Milky Way
    journal, April 2019

    • Côté, Benoit; Eichler, Marius; Arcones, Almudena
    • The Astrophysical Journal, Vol. 875, Issue 2
    • DOI: 10.3847/1538-4357/ab10db

    Level densities of Ge 74 , 76 from compound nuclear reactions
    journal, May 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
    journal, December 2019

    • McKay, John E.; Denissenkov, Pavel A.; Herwig, Falk
    • Monthly Notices of the Royal Astronomical Society, Vol. 491, Issue 4
    • DOI: 10.1093/mnras/stz3322

    Learning about the Intermediate Neutron-capture Process from Lead Abundances
    journal, December 2019

    • Hampel, Melanie; Karakas, Amanda I.; Stancliffe, Richard J.
    • The Astrophysical Journal, Vol. 887, Issue 1
    • DOI: 10.3847/1538-4357/ab4fe8