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Neutrinos and Supernova Nucleosynthesis: Importance for Astronomy and Cosmochemistry

Neutrinos and Supernova Nucleosynthesis: Importance for Astronomy and Cosmochemistry. Bradley S. Meyer Clemson University. Standard Picture. 92,94 Mo: p process 95 Mo: r, s processes 96 Mo: s process 97,98 Mo: s, r processes 100 Mo: r process. Motivation to Restudy 92,94 Mo synthesis.

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Neutrinos and Supernova Nucleosynthesis: Importance for Astronomy and Cosmochemistry

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  1. Neutrinos and Supernova Nucleosynthesis: Importance for Astronomy and Cosmochemistry Bradley S. Meyer Clemson University

  2. Standard Picture • 92,94Mo: p process • 95Mo: r, s processes • 96Mo: s process • 97,98Mo: s, r processes • 100Mo: r process

  3. Motivation to Restudy 92,94Mo synthesis • Yin et al. (2000) find 92Nb/93Nb = 1 x 10-3 in the early solar system • Requires a high production ratio (such as seen in neutrino-driven wind scenarios) to account for such a high amount of 92Nb (halflife = 52 Myr)

  4. Neutrino Capture on All Species

  5. Capture on Z < 40

  6. Implications for Extinct Radioactivities • P(92Nb)/P(93Nb) = 0.92 • N(92Nb)/N(93Nb) = 2.6 x 10-2 (to be compared to 1 x 10-3), which suggests the need for a decay interval

  7. Conclusions (I) • Neutrinos can influence explosive supernova nucleosynthesis: • Change Ye during equilibrium phases • More directly change abundances during freezeout phases either by spallation or by making what are normally beta stable nuclei unstable • Particular neutrino-nucleus interactions may prove to be “gateways” and their cross sections may thus be particularly interesting for experimental study.

  8. Conclusions (II) • The yields of special isotopes may be dependent on the flux of supernova neutrinos during nucleosynthesis • Light p-isotopes may be explained by this flux which in turn may provide constraints on supernovae=>importance for astronomy • Cosmochemically interesting isotopes like 92Nb may also be produced=>importance for cosmochemistry

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