In this pull request, we present several solutions to the decay-chain problem, as follows:
- an analytical solution;
- numerical solutions based on the operator splitting approach (time step size = 5 and 100 years);
- numerical solutions based on the global implicit approach (serial model and parallelized model with 4 and 8 processors);
- numerical solution obtained from a reference code (Dirichlet boundary condition needs to be re-examined);
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