This is no ordinary experiment. With a huge detector in tow and a team of 15 scientists from Goethe University in Frankfurt (Germany), it is probably as big as science gets -literally.
A 4-metre-long lorry arrived at the ESRF with a precious load: a so-called COLTRIMS Reaction Microscope. The chamber is so big that it requires a crane to fit it into the experimental hutch of ID31. And lots of manpower to set the experiment up. The aim: to image the momentum distribution of one of the two electrons in the Helium atom without averaging over the momentum distribution of the other, offering the most complete and detailed view on electron correlation.
The COLTRIMS technique allows the team to measure event by event the initial state momentum of a Compton scattered electron of a Helium atom and, in coincidence with this, they measure the second electron’s momentum as it is shaken off.
Image: The team was in high spirits throughout the two-week duration of the experiment.
Credits: M. Kircher.