In an experiment with the BigRIPS separator at the RIKEN Nishina Center, the fragmentation of a 78Kr beam allowed the observation of new neutron-deficient isotopes at the proton drip-line. Clean identification spectra could be produced and 63Se, 67Kr, and 68Kr were identified for the first time. In addition, 59Ge was also observed. Three of these isotopes, 59Ge, 63Se, and 67Kr, are potential candidates for ground-state two-proton radioactivity. In addition, the isotopes 58Ge, 62Se, and 66Kr were also sought but without success. The present experiment also allowed the determination of production cross sections for some of the most exotic isotopes. These measurements confirm the trend already observed that the empirical parameterization of fragmentation cross sections, EPAX, significantly overestimates experimental cross sections in this mass region.
@article{arxiv.1605.05905,
title = {New neutron-deficient isotopes from $^{78}$Kr fragmentation},
author = {B. Blank and T. Goigoux and P. Ascher and M. Gerbaux and J. Giovinazzo and S. Grevy and T. Kurtukian Nieto and C. Magron and J. Agramunt and A. Algora and V. Guadilla and A. Montaner-Piza and A. I. Morales and S. E. A. Orrigo and B. Rubio and D. S. Ahn and P. Doornenbal and N. Fukuda and N. Inabe and G. Kiss and T. Kubo and S. Kubono and S. Nishimura and V. H. Phong and H. Sakurai and Y. Shimizu and P. -A. Soderstrom and T. Sumikama and H. Suzuki and H. Takeda and J. Wu and Y. Fujita and M. Tanaka and W. Gelletly and P. Aguilera and F. Molina and F. Diel and D. Lubos and G. de Angelis and D. Napoli and C. Borcea and A. Boso and R. B. Cakirli and E. Ganioglu and J. Chiba and D. Nishimura and H. Oikawa and Y. Takei and S. Yagi and K. Wimmer and G. de France and S. Go},
journal= {arXiv preprint arXiv:1605.05905},
year = {2016}
}