Sensitivity analysis for tallies #3479
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Calc. Sens. Coeffs. in one run
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See #3179 that was closed.
This PR adds tally to score sensitivity coefficients. The tally is useful to perform sensitivity and uncertainty analysis. This feature extends the development by @alhajri on eigenvalue sensitivity analysis to fixed-source problems.
N.B. Benchmarking the sensitivity tally is still ongoing and still needs lot of work. Folks can take a look to provide advice and help clean up the code.
The feature is applicable to both criticality and fixed-source problems. My verification is however focused on fixed-source applications. Usage requires to run one OpenMC simulation during which the sensitivity coefficients are calculated. Details of how to calculate the sensitivity coefficients can be found in here