Nuclear Structure and Dynamics

An isomeric state in rubidium-98

An isomeric state in rubidium-98: Several elements around rubidium undergo a dramatic change in the nuclear shape when they cross 60 neutrons within the nucleus. 98RB is the first isotope in the Rb chain above this number and had been postulated to contain a long-lived isomeric state. This was confirmed for the first time using laser spectroscopy measurements at ISAC, where not only was the state confirmed but also the shape, size and spin of both nuclear states were determined. Using this information it could be shown that both states were built on the same on the same basic structure and the isomer was not, as was previously thought, based on the shape of the light nuclei.