I don't think ROOT is very common in the atomic community. For experimental control, LabView is quite common, and it seems to have pitfalls too. But from what I know, the experiment itself is very straight forward, there are not so many places error can hide. Especially since they can calibrate/cross check everything with known H20 lines.
On the electron scattering side, ROOT is more common, but the experiments which are most relevant for the radius either predate ROOT or are known to not work with ROOT. Doesn't mean the software used has no errors, quite the contrary, however since all the results from different measurements with different software agree, I think a programming error is not the culprit.
On the electron scattering side, ROOT is more common, but the experiments which are most relevant for the radius either predate ROOT or are known to not work with ROOT. Doesn't mean the software used has no errors, quite the contrary, however since all the results from different measurements with different software agree, I think a programming error is not the culprit.