Figure 48: Pippard’s coherence length for the neutron star crust model of Negele & Vautherin[303].
The coherence length has been calculated from Equation (138), assuming that the neutron superfluid
is uniform with the density of unbound neutrons denoted by in [303]. Three representative
cases have been considered: the BCS pairing gap , and the more realistic pairing gaps of Cao et
al. [69] and Schwenk et al. [366]. The gaps are shown in Figure 46. For comparison, we also show
the radius of the Wigner–Seitz sphere and the mean inter-neutron spacing .
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