New neutron-deficient isotopes from ${}^{78}$Kr fragmentation

Abstract

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. 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.

arXiv commentaccepted as Rapid Communication in PRC

References in corpus (8)

• Modified Empirical Parametrization of Fragmentation Cross Sections
• Identification and Separation of Radioactive Isotope Beams by the BigRIPS Separator at the RIKEN RI Beam Factory
• First observation of 54Zn and its decay by two-proton emission
• Proton Drip-Line Calculations and the Rp-process
• Two-proton radioactivity
• Improved Empirical Parametrization of Fragmentation Cross Sections
• Production cross section measurements of radioactive isotopes by BigRIPS separator at RIKEN RI Beam Factory
• Beta-Delayed Proton Emission Branches in 43Cr

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• Beta decay of the very neutron-deficient ${}^{60}$Ge and ${}^{62}$Ge nuclei
• Discovery of ${}^{68}$Br in secondary reactions of radioactive beams
• 2016 Update of the discovery of nuclides
• Isobaric-multiplet mass equation in a macroscopic-microscopic approach
• Predictions for cross sections of light proton-rich isotopes in ${}^{40}$Ca + ${}^9$Be reaction
• Isospin compositions of correlated sources in the Fermi energy domain
• Quantifying uncertainty in physics-based predictions of rare-isotope production cross sections via Bayesian-inspired model averaging across nuclear mass tables