// multi-utility computation suite · offline · instant · precise
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sci.neutron-moderation-slowing Calculator
Calculates the logarithmic energy decrement ξ per collision and number of collisions to thermalise fast neutrons for different moderators. Hydrogen (A=1): ξ = 1.0, needs ~18 collisions to thermalise; deuterium: ξ = 0.725, ~25 collisions; carbon: ξ = 0.158, ~115 collisions.
Inputs
A Mass Number
Count of items or occurrences.
E Initial Ev
Capacity to do work (J or kWh). Conserved — converts between forms but total stays constant in a closed system.
E Target Ev
Capacity to do work (J or kWh). Conserved — converts between forms but total stays constant in a closed system.
Xs Scatter B
Reference formula or conversion factor shown for context.
Results
logarithmic energy decrement ξ
Sample size or count used in the calculation.
collisions to thermalize
Sample size or count used in the calculation.
mean free path λ (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.