What density is reached when electrons are forced into nuclei, causing neutronization?
Answer
Around $4 \times 10^{11} \text{ g/cm}^3$
When the collapsing core reaches a critical density of approximately $4 \times 10^{11} \text{ g/cm}^3$, electrons combine with protons to form neutrons, releasing neutrinos and effectively removing the electron pressure support.
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