What ultimately provides the momentary outward pressure that halts the initial rapid collapse into a neutron density core?

Answer

Neutron degeneracy pressure

When the core density skyrockets to nuclear densities, the strong nuclear force and, crucially, neutron degeneracy pressure provide the resistance that momentarily stops the inward collapse.

What ultimately provides the momentary outward pressure that halts the initial rapid collapse into a neutron density core?
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