- decayLifetime
Decay Rate
The RxnRate block to be used to set the lifetime
of a species under going a decay. Must be paired with
a Decay ProductGenerator.
decayLifetime Attributes
- lifetime (float, required)
- the lifetime of the species, in seconds 
Example decayLifetime Block
<RxnRate rxnRate>
  kind = decayLifetime
  lifetime = 0.0
</RxnRate>