Which neutron cross-section represents capture without fission?

• A. Scattering (Σ_s) – deflects neutrons without capture.
• B. Fission (Σ_f) – causes fission events.
• C. Total cross-section (Σ_t) – overall interaction probability.
• D. Absorption (Σ_a) – captures neutrons.

Answer: (D)