Free Neutron Flux Calculator
Calculate neutron flux from neutron density and velocity, or the reaction rate in a material.
Neutron Flux (phi)
22,000,000,000,000.000 n/(cm²·s)
Neutron Flux (phi) vs Neutron Density (n)
Neutron Flux and Reaction Rate
Neutron flux is a fundamental quantity in nuclear reactor physics. It determines the rate of nuclear reactions.
Formulas
phi = n × v (neutron flux)
R = phi × Sigma = n × v × Sigma (volumetric reaction rate)
where n is neutron density, v is neutron speed, and Sigma is the macroscopic cross section. Thermal neutron velocity at room temperature is about 2200 m/s.
Example Calculation
A thermal reactor with n = 10⁸ n/cm³, v = 2.2 × 10⁵ cm/s, Sigma = 0.1 cm⁻¹.
- 01phi = 10⁸ × 2.2 × 10⁵ = 2.2 × 10¹³ n/(cm²·s)
- 02R = 2.2 × 10¹³ × 0.1 = 2.2 × 10¹² reactions/(cm³·s)
Frequently Asked Questions
Learn More
Understanding Molarity
Learn what molarity is, how to calculate it, and why it matters in chemistry. Covers moles, liters, dilution, and step-by-step examples for preparing solutions.