SANS: |Q| = (4π/λ)·sin(θ/2)

Layer 1 — Physicsin the neutron-physics subtree

Small-angle neutron scattering (SANS) measures the coherent elastic-scattering differential cross-section dσ/dΩ as a function of momentum-transfer magnitude |Q| = |k_f - k_i|. For elastic scattering (|k_f| = |k_i| = 2π/λ), geometry gives…

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SANS extremes: Q(θ=0)=0; Q(θ=π)=4π/λ

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