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Doornenbal, R.B. Cakirli, S.E.A. Orrigo, S. Go, S. Grevy, S. Kubono, S. Nishimura, S. Yagi, T. Goigoux, T. Kubo, T. Kurtukian Nieto, T. Sumikama, V. Guadilla, V. H. Phong, W. Gelletly, Y. Fujita, Y. Shimizu, Y. Takei","submitted_at":"2016-05-19T12:02:02Z","abstract_excerpt":"In an experiment with the BigRIPS separator at the RIKEN Nishina Center, the fragmentation of a $^{78}$Kr beam allowed the observation of new neutron-deficient isotopes at the proton drip-line. Clean identification spectra could be produced and $^{63}$Se, $^{67}$Kr, and $^{68}$Kr were identified for the first time. In addition, $^{59}$Ge was also observed. Three of these isotopes, $^{59}$Ge, $^{63}$Se, and $^{67}$Kr, are potential candidates for ground-state two-proton radioactivity. In addition, the isotopes $^{58}$Ge, $^{62}$Se, and $^{66}$Kr were also sought but without success. 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