Effective target area (barns, 1 b = 10⁻²⁸ m²) for a nuclear reaction. Energy-dependent resonances; thermal vs fast-neutron σ differ by 10⁶. Fundamental to reactor + weapons design.
Effective target area (barns, 1 b = 10⁻²⁸ m²) for a nuclear reaction. Energy-dependent resonances; thermal vs fast-neutron σ differ by 10⁶. Fundamental to reactor + weapons design.