If the iron core remnant's mass is below roughly $3 M_{\odot}$ after implosion begins, what halts the collapse to form a neutron star?
Answer
Neutron degeneracy pressure
If the remnant mass is sufficiently low (below roughly $3 M_{\odot}$), the collapse is eventually stopped when the density exceeds that of an atomic nucleus, initiating neutron degeneracy pressure, which strongly resists further confinement.
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