Normalize k by total_weight instead of n_particles #7332

Job	Run time
Python 3.11 (omp=y, mpi=y, dagmc=n, libmesh=n, event=n vectfit=n)	1h 8m 41s
Python 3.11 (omp=n, mpi=y, dagmc=n, libmesh=n, event=n vectfit=n)	1h 8m 42s
Python 3.13 (omp=n, mpi=n, dagmc=, libmesh=, event= vectfit=)	1h 8m 27s
Python 3.11 (omp=n, mpi=n, dagmc=n, libmesh=n, event=n vectfit=n)	1h 8m 42s
Python 3.12 (omp=n, mpi=n, dagmc=, libmesh=, event= vectfit=)	1h 8m 42s
Python 3.11 (omp=y, mpi=n, dagmc=n, libmesh=n, event=n vectfit=n)	1h 8m 42s
Python 3.11 (omp=y, mpi=n, dagmc=, libmesh=y, event= vectfit=)	1h 8m 43s
Python 3.11 (omp=n, mpi=y, dagmc=, libmesh=, event= vectfit=y)	1h 8m 42s
Python 3.11 (omp=y, mpi=n, dagmc=, libmesh=, event=y vectfit=)	1h 8m 42s
Python 3.11 (omp=y, mpi=y, dagmc=y, libmesh=, event= vectfit=)	1h 8m 42s
Python 3.11 (omp=y, mpi=y, dagmc=, libmesh=y, event= vectfit=)	1h 8m 42s
finish	-1s
	12h 35m 26s

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