Open AccessNuclear Reaction Sensitivity in Magnetohydrodynamically Driven Supernovae
Author(s) -
S. Jin
Publication year - 2022
Publication title -
astrophysical journal/the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.3847/1538-4357/ac4f4a
Subject(s) - nucleosynthesis , physics , supernova , astrophysics , nuclear reaction , stars , r process , sensitivity (control systems) , type ii supernova , magnetohydrodynamics , star formation , nuclear physics , plasma , electronic engineering , engineering
The weak r -process offers an explanation of the formation of lighter heavy elements 36 ≤ Z ≤ 47 in ultra-metal-poor stars. Magnetohydrodynamically driven supernovae are thought to be a robust astronomical site of the weak r -process and recently gave a good description of the observational abundance pattern of an extremely metal-poor star. However, the characteristics of nuclear reactions in the MHD nucleosynthesis are not as clear as in another site, that of core-collapse supernovae. In this paper, the trajectories of the MHD model are implemented into SkyNet network calculations. By varying the reaction rates of each type, the ( α , n ) reactions are much more active than other types of reactions, such as ( n , γ ), ( p , γ ), ( n , p ), and ( α , p ). A further detailed sensitivity study investigates the ( α , n ) reactions and lists the most influential ones over the whole range, and the impactful reactions on each element from Sr to Ag are tabulated.