1 / 14

Neutrinos and Supernova Nucleosynthesis: Importance in Astronomy and Cosmochemistry

Explore the impact of neutrinos on explosive supernova nucleosynthesis, their role in changing nucleus abundances, and implications for extinct radioactivities. Understand the significance of neutrino capture on various species and its influence on special isotopes in cosmic processes.

blantons
Download Presentation

Neutrinos and Supernova Nucleosynthesis: Importance in Astronomy and Cosmochemistry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related