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Title: Simultaneous iron and nickel isotopic analyses of presolar silicon carbide grains

Journal Article · · Geochimica et Cosmochimica Acta
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Chicago, IL (United States); Chicago Center for Cosmochemistry, Chicago, IL (United States)
  2. Univ. of Chicago, IL (United States); Chicago Center for Cosmochemistry, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of Chicago, IL (United States); Chicago Center for Cosmochemistry, Chicago, IL (United States); Univ. of Chicago, IL (United States). Enrico Fermi Inst.
  5. Univ. of Chicago, IL (United States); Chicago Center for Cosmochemistry, Chicago, IL (United States); Univ. of Chicago, IL (United States). Enrico Fermi Inst.; Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Univ. of Chicago, IL (United States); Chicago Center for Cosmochemistry, Chicago, IL (United States)
  7. Washington Univ., St. Louis, MO (United States)
  8. Univ. of Torino (Italy)
  9. Univ. of Torino (Italy); Istituto Nazionale di Astrofisica (INAF), Torino (Italy)
  10. Osservatorio Astronomico di Teramo (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Perugia (Italy)
+ Show Author Affiliations

Aside from recording stellar nucleosynthesis, a few elements in presolar grains can also provide insights into the galactic chemical evolution (GCE) of nuclides. We have studied the carbon, silicon, iron, and nickel isotopic compositions of presolar silicon carbide (SiC) grains from asymptotic giant branch (AGB) stars to better understand GCE. Since only the neutron-rich nuclides in these grains have been heavily in uenced by the parent star, the neutron-poor nuclides serve as GCE proxies. Using CHILI, a new resonance ionization mass spectrometry (RIMS) instrument, we measured 74 presolar SiC grains for all iron and nickel isotopes. With the CHARISMA instrument, 13 presolar SiC grains were analyzed for iron isotopes. All grains were also measured by NanoSIMS for their carbon and silicon isotopic compositions. A comparison of the measured neutron-rich isotopes with models for AGB star nucleosynthesis shows that our measurements are consistent with AGB star predictions for low-mass stars between half-solar and solar metallicity. Furthermore, our measurements give an indication on the 22Ne( ,n)25Mg reaction rate. In terms of GCE, we nd that the GCE-dominated iron and nickel isotope ratios, 54Fe/56Fe and 60Ni/58Ni, correlate with their GCE-dominated counterpart in silicon, 29Si/28Si. The measured GCE trends include the Solar System composition, showing that the Solar System is not a special case. However, as seen in silicon and titanium, many presolar SiC grains are more evolved for iron and nickel than the Solar System. This con rms prior ndings and agrees with observations of large stellar samples that a simple age-metallicity relationship for GCE cannot explain the composition of the solar neighborhood.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344; LLNL-JRNL-723517
OSTI ID:
1414366
Alternate ID(s):
OSTI ID: 1550102
Report Number(s):
LLNL-JRNL-723517; TRN: US1800695
Journal Information:
Geochimica et Cosmochimica Acta, Vol. 221, Issue C; ISSN 0016-7037
Publisher:
The Geochemical Society; The Meteoritical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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  • Stephan, T.; Zehnpfenning, J.; Benninghoven, A.
  • Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 12, Issue 2 https://doi.org/10.1116/1.579255
journal March 1994
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Cited By (4)

Resonance ionization of titanium: high useful yield and new autoionizing states journal January 2018
The Importance of the 13 C( α ,n) 16 O Reaction in Asymptotic Giant Branch Stars journal May 2018
New Constraints on the Major Neutron Source in Low-mass AGB Stars journal September 2018
New Constraints on the Abundance of 60 Fe in the Early Solar System journal April 2018

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