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Studies of negative ions of radioactive isotopes (ISOLDE, CERN)

ISOLDE at CERN in Switzerland is an online facility for production of radioactive isotopes. A 1 GeV proton beam impinges in a target of uranium carbide where a very wide range of radioactive isotopes are produced. The different isotopes diffuse into an ion source where they are ionized. Ions produced in the ion source are extracted, accelerated and mass analyzed, and finally guided to different experimental end-stations.

We used the ISOLDE facility to measured electron affinities of radioactive isotopes. A major achievement is that we have measured the electron affinity of astatine, which is the least abundant element on earth. The interest in this element stems from the fact that the At- isotope is used the cancer treatment method Target Alfa Therapy (TAT). We will also study isotopes shifts in electron affinities. We have for these studies built a dedicated end station GANDALPH (Gothenburg ANion Detector for Affinity measurements by Laser PHotodetachment) where the radioactive negative ion beam is overlapped with a laser beam. Neutral atoms produced in the photodetachment process are detected with a neutral particle detector.

Page Manager: Måns Henningson|Last update: 2/28/2019

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