powerLawCrossSection

Power Law Cross-Section

Use kind = powerLawCrossSection to set a cross section [m^2] according to a power law:

\[\sigma (x) = Ax^E\]

powerLawCrossSection Attributes

coefficient (float, required)

The coefficient, A, in the equation above.

exponent (float, required)

The exponent, E, in the equation above.

variable (string, required)

Set the dependent variable, x, in the equation above. Options are:

• velocity [m/s]

• energy [J]

This sets whether vorpal uses the velocity or energy of the reactant particles to calculate the probability of an interaction.

Example powerLawCrossSection Block

<RxnRate rxnRate>
  kind = powerLawCrossSection
  coefficient = 1.0e-15
  exponent = -1.0
  variable = velocity
</RxnRate>