Supernova Sources and the 92NB-92ZR P-Process Chronometer

Details Supernova Sources and the 92NB-92ZR P-Process Chronometer Supernova Sources and the 92NB-92ZR P-Process Chronometer

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...536l..49y&link_type=abstract

The Astrophysical Journal, Volume 536, Issue 1, pp. L49-L53.

Astronomy and Astrophysics

Astronomy

11

Ism: Abundances, Nuclear Reactions, Nucleosynthesis, Abundances, Solar System: Formation, Stars: Supernovae: General

Scientific paper

We report new Zr isotope evidence for live 92Nb (mean life: τ92Nb=52 Myr) within the early solar system resulting in (92Nb/93Nb)initial~10-3. The meteoritic minerals rutile and zircon have, respectively, very high and very low Nb/Zr ratios and are ideal for exploring the 92Nb-92Zr chronometer. Rutiles exhibit high positive ɛ92Zr (~14-36) while a zircon has a negative ɛ92Zr (~-4), as would be expected if 92Nb was live in the early solar system. The meteoritic rutiles appear to be young, with apparent times of formation of ~80-220 Myr subsequent to the origin of the solar system. The initial 92Nb/92Mo for the solar system is broadly compatible with a model of uniform production if the 92Nb/92Mo production ratio for Type II supernova (SNII) sources with neutrino-driven winds is used. Data for all the now extinct p-process nuclides (92Nb, 97Tc, and 146Sm) are consistent with these isotopes being derived by uniform production from SNII sources and a free decay interval of ~10 Myr. Consideration of a range of models indicates that the average p-process production ratio of 92Nb/92Mo needs to be at least in the range of 0.06-0.25.

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