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Author Quitte, Ghylaine ♦ Markowski, Agnes ♦ Latkoczy, Christopher ♦ Gabriel, Aron ♦ Pack, Andreas
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ ABUNDANCE ♦ ALUMINIUM 26 ♦ HAFNIUM 182 ♦ IRON 56 ♦ IRON 60 ♦ MANGANESE 53 ♦ METEORITES ♦ METEOROIDS ♦ NICKEL 60 ♦ NUCLEAR REACTIONS ♦ NUCLEOSYNTHESIS ♦ PROTOPLANETS ♦ SILICATES ♦ SOLAR SYSTEM ♦ SOLAR SYSTEM EVOLUTION ♦ ALUMINIUM ISOTOPES ♦ BETA DECAY RADIOISOTOPES ♦ BETA-MINUS DECAY RADIOISOTOPES ♦ BETA-PLUS DECAY RADIOISOTOPES ♦ ELECTRON CAPTURE RADIOISOTOPES ♦ EVEN-EVEN NUCLEI ♦ EVOLUTION ♦ HAFNIUM ISOTOPES ♦ HEAVY NUCLEI ♦ HOURS LIVING RADIOISOTOPES ♦ INTERMEDIATE MASS NUCLEI ♦ IRON ISOTOPES ♦ ISOMERIC TRANSITION ISOTOPES ♦ ISOTOPES ♦ LIGHT NUCLEI ♦ MANGANESE ISOTOPES ♦ NICKEL ISOTOPES ♦ NUCLEI ♦ ODD-EVEN NUCLEI ♦ ODD-ODD NUCLEI ♦ OXYGEN COMPOUNDS ♦ RADIOISOTOPES ♦ SECONDS LIVING RADIOISOTOPES ♦ SILICON COMPOUNDS ♦ STABLE ISOTOPES ♦ SYNTHESIS ♦ YEARS LIVING RADIOISOTOPES
Abstract Short-lived radionuclides (e.g., {sup 26}Al, {sup 53}Mn, {sup 60}Fe, {sup 182}Hf) are widely used to refine the chronology of the early solar system. They provide chronological information, however, only if they were homogeneously distributed in the source region of the objects under scrutiny at the time of their formation. With the high level of precision now achieved on isotopic measurements, very short time intervals can in principle be resolved and a precise evaluation of the initial homogeneity degree becomes increasingly crucial. High-precision nickel isotope data for differentiated meteorites (angrites, ureilites) and chondritic (CB) components allow us to test the initial distribution of radioactive {sup 60}Fe and stable Ni isotopes. Although these meteorites appear to have formed nearly contemporaneously, they yield variable initial {sup 60}Fe/{sup 56}Fe ratios. Besides, the CB metal nodules and ureilite silicates show nucleosynthetic anomalies. The new data presented here do not confirm the recently inferred late injection of {sup 60}Fe into the protoplanetary disk. Instead, live {sup 60}Fe was present, but heterogeneously distributed, from the start of the solar system, revealing an incomplete mixing of material from various nucleosynthetic sources and restricting the use of the {sup 60}Fe-{sup 60}Ni system as a chronometer.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-09-10
Publisher Place United States
Journal Astrophysical Journal
Volume Number 720
Issue Number 2


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