Calcolatore Energia Fissione Nucleare — Formula
## 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.
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.
Esempio Risolto
A thermal reactor with n = 10⁸ n/cm³, v = 2.2 × 10⁵ cm/s, Sigma = 0.1 cm⁻¹.
- phi = 10⁸ × 2.2 × 10⁵ = 2.2 × 10¹³ n/(cm²·s)
- R = 2.2 × 10¹³ × 0.1 = 2.2 × 10¹² reactions/(cm³·s)