The 17th International Symposium on Origin of Matter and Evolution of Galaxies

Origin of r- and nu-process elements in cosmic evolution and nuclear physics

8 Sept 2024, 11:10

25m

Invited Talk Theoretical Nuclear Physics for Astrophysics Theoretical Nuclear Physics for Astrophysics

Speaker

Toshitaka KAJINO (Beihang University, National Astronomical Observatory of Japan, University of Tokyo)

Description

There is a growing consensus in recent multi-messenger astronomy that the explosions of single massive stars, i.e. magneto-hydrodynamic jet supernovae and collapsars, dominate the r-element enrichment over the entire history of cosmic evolution, while kilonovae could partly contribute to recent epoch due to the cosmologically long time-delay of merging binary neutron stars [1,2]. We have recently found that the i- and s-processes could follow the collapsar r-process [3]. These explosive phenomena emit extremely large flux of energetic neutrinos and provide unique nucleosynthetic signals of the neutrino-nucleus interactions at high-densities [4]. We first discuss when and how these different astrophysical sites have contributed to the enrichment of the r-process elements in cosmic and Galactic chemical evolution model. We then discuss the roles of nuclear fissions, isomers, neutron-captures, beta-decays and neutrino-weak responses in these explosive nucleosyntheses.

[1] C. Kobayashi, A. Karakas, M. Lugaro, ApJ. 900 (2020), 179.
[2] Y. Yamazaki, Z. He, T. Kajino, et al., Astrophys. J. 933 (2022), 112.
[3] Z. He, T. Kajino, M. Kusakabe, et al., Astrophys. J. Lett. 966 (2024), L37.
[4] H. Sasaki, Y. Yamazaki, T. Kajino, et al., Phys. Lett. B851 (2024), 138581.