What is the immediate radioactive product derived from $^{56}$Ni formed during explosive nucleosynthesis?

Answer

Cobalt-56 ($^{56}$Co)

Once synthesized, $^{56}$Ni is radioactive; it decays within days to cobalt-56 ($^{56}$Co), which in turn decays to the stable isotope iron-56 ($^{56}$Fe).

What is the immediate radioactive product derived from $^{56}$Ni formed during explosive nucleosynthesis?
Elementastronomystarsupernovanucleosynthesis