Physicists Discover Heaviest Known Proton-Emitting Isotope: Astatine-188


Using the focal-plane spectrometer of the gas-filled recoil separator at the Accelerator Laboratory of the University of Jyväskylä in Finland, physicists have observed two decay events of the new isotope astatine-188 (188At), which consists of 85 protons and 103 neutrons.
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