(Phys.org) —A research team led by FOM workgroup leader Prof. Dr. Wim Ubachs and Dr. Rick Bethlem has once again demonstrated that the mass ratio between electrons and protons has remained the same over the past 7.5 billion years. The group, which published this conclusion last January in Science, has recently performed a wide range of measurements that confirm their earlier finding. The new results are published on 4 December in Physical Review Letters.
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