At the RIKEN facility in Japan experiments have been conducted that for the first time have unambiguously identified 4 new isotopes crossing the proton drip line. Such high Z low N isotopes have been so short lived that up to this point it was impossible to experimentally investigate the mechanism of proton emission around the Sn-100 shell closures. This gives us new insight into the mass excess in this region and updates the models we use to predict these nuclei.
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