Isomer residual ratio of odd-odd isotope Ta in supernova nucleosynthsis

Hayakawa, Takehito; Kajino, Toshitaka*; Chiba, Satoshi; Mathews, G. J.*

The nucleosynthesis of an odd-odd isotope Ta has remained an unsolved problem and as its origin many nucleosynthesis mechanisms have been proposed. We have made a new time-dependent calculation of Tameta-stable isomer residual ratio after supernova neutrino-inducedreactions. This isomer residual ratio is crucial for understanding the production and survival of this isotope. We include the linking between the isomer and all known excited states. We find that the relative solar abundance of Ta can be reproduced by a supernova model with the neutrino temperature of 4 MeV.