A beam has flux (particles per unit area per unit time) and covers a target of…

PHYSICS · Subjective · Fermi University Physics · Particle Physics & Quantum Fields · Particles, interactions and experiment · Particles, interactions and experiment

Particle Physics, Ch Decay rates, cross sections and phase space

Problem

A beam has flux Φ=2.0×1010 m−2 s−1\Phi = 2.0\times10^{10}\,\mathrm{m^{-2}\,s^{-1}} (particles per unit area per unit time) and covers a target of cross-sectional area A=4.0×10−4 m2A = 4.0\times10^{-4}\,\mathrm{m^2}. The target has thickness ℓ=0.15 m\ell = 0.15\,\mathrm{m} and number density ρn=3.3×1028 m−3\rho_n = 3.3\times10^{28}\,\mathrm{m^{-3}}. For a process with cross section σ=0.65 mb\sigma = 0.65\,\mathrm{mb}, treating the target as thin, find the event rate N˙\dot N.

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