Extinct technetium in silicon carbide stardust grains : implications for stellar nucleosynthesis.

Journal Article · Fri Jan 30 00:00:00 EST 2004 · Science

DOI:https://doi.org/10.1126/science.3030649· OSTI ID:961418

Savina, M R; Davis, A M; Tripa, C E; Pellin, M J; Gallino, R; Lewis, R S; Amari, S

The isotopic composition of ruthenium (Ru) in individual presolar silicon carbide (SiC) stardust grains bears the signature of s-process nucleosynthesis in asymptotic giant branch stars, plus an anomaly in {sup 99}Ru that is explained by the in situ decay of technetium isotope {sup 99}Tc in the grains. This finding, coupled with the observation of Tc spectral lines in certain stars, shows that the majority of presolar SiC grains come from low-mass asymptotic giant branch stars, and that the amount of {sup 99}Tc produced in such stars is insufficient to have left a detectable {sup 99}Ru anomaly in early solar system materials,

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC); FOR; National Aeronautics and Space Administration (NASA)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 961418
• Report Number(s): ANL/MSD/JA-47570; SCEHDK; TRN: US201012%%1481
• Journal Information: Science, Vol. 303, Issue 5658 ; Jan. 30, 2004; ISSN 0193-4511
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DECAY
NUCLEOSYNTHESIS
RUTHENIUM
RUTHENIUM 99
S PROCESS
SILICON CARBIDES
SOLAR SYSTEM
STARS
TECHNETIUM
TECHNETIUM 99
TECHNETIUM ISOTOPES