What two critical physical processes transform the composition of the core during its rapid, runaway implosion?

Answer

Electron Capture (Neutronization) and Photodisintegration

During the extreme compression of the collapse, electrons merge with protons to form neutrons (neutronization), and high-energy gamma rays split iron nuclei (photodisintegration), both of which accelerate the collapse.

What two critical physical processes transform the composition of the core during its rapid, runaway implosion?
Corestarmassive