// multi-utility computation suite · offline · instant · precise
┌──────────────────────────┐
│ [c] calcalyst_ │
│ computation suite │
└──────────────────────────┘
// select a module to initialize
/ search↵ open firstesc close
// adsenseEMPTY_LEADER_SLOT728×90
// adsenseMOBILE_ANCHOR_SLOT320×50
// keyboard_shortcuts
/focus search
↑↓navigate module list
Enter
open first result from search
open highlighted
compute when module is open
compute when focused in a field
Escclose module · clear selection
⌫
sci.nuclear-cross-section-mfp Calculator
Calculates the nuclear reaction cross-section and mean free path for neutrons in a material: λ = 1/(nσ). ²³⁵U fission cross-section for thermal neutrons ≈ 584 barns (1 barn = 10⁻²⁸ m²) — reactor designers must account for resonance absorption peaks in U-238.
Inputs
Target Density G Cm3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Molar Mass G Mol
Mass of one mole of the substance (g/mol). Found by summing atomic weights. Converts between grams and moles.
Cross Section Barns
Reference formula or conversion factor shown for context.
Results
mean free path MFP (cm)
Arithmetic average — sum divided by count. Simple and familiar, but pulled by outliers. If your data contains extreme values, the median may be more representative.