Correct physics of C14 example

Failed in 46m 39s
📄 Build and Deploy Documentationjulia --project=docs -e ' && println("--- :julia: Instantiating project") && using Pkg && Pkg.develop(PackageSpec(path=pwd())) && Pkg.instantiate() && println("--- :julia: Building documentation") && include("docs/make.jl") && '
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Total Job Run Time: 46m 36s