decay

Decay

Works with a VSimPD license. Interaction of the form:

\[A \rightarrow B \; (+ C + \gamma )\]

A decay of a single particle into one or more products. The daughter particles can be a single species, a single species and a photon, two species (without a photon), or two species and with a photon.

Should be paired with a decayLifetime RxnPhysics block in a RxnProcess Block.

Any RxnProcess Block block which points to a productGenerator of kind = decay should have the Reactants and Products in the order:

reactants = [speciesA]
products = [speciesB (speciesC)]

decay Attributes

untrackedPhoton (boolean, required)

Whether or not energy is lost to an untracked photon.

VAtheory (boolean, optional, default = 0)

If there is an untracked photon, this flag determines how the lost energy is calculated. Options are:

• 1 Use VA theory to determine energy loss

• 0: The lost energy is uniformly distributed between none and all.

This parameter does nothing if untrackedPhoton = 0.

randomSeed (int, optional, default: random int)

Manually set a random seed used to determine the final velocities of the product particles.

The default is to choose a random seed at run time. To produce identical simulations, advanced users may want to manually set a seed. It is recommended not to include this parameter so that a different random number will be generated for each run.

Example decay Block

<RxnProductGenerator productGenerator>
  kind = decay
  untrackedPhoton = 1
  VAtheory = 1 #using VA theory to determine energy lost in decay
  #randomSeed = 423
</RxnProductGenerator>