= Single-spin density of states
{title2=$\nu_s=\nu_{\mathrm{tot}}/2$}
The <single-spin density of states> counts <momentum> states for one <spin> species. For degenerate up and down species, the spin-summed <density of states> is twice this value. Specify separately whether the density is per unit <volume> or extensive. In the <BCS gap equation>, the <momentum> sum labels opposite-spin pairs once and therefore uses the single-spin density per <volume> when the interaction has <normalization> $V/\mathcal V$.
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