In-flight and decay spectroscopy of ⁹⁵Kr

Excited states in ⁹⁵Kr have been measured at the RIBF at the RIKEN Nishina Center for Accelerator-Based Science via a prompt-delayed correlation analysis of conjoined SEASTAR and EURICA data. Even-even Sr and Zr nuclei in the A=100 region show a sudden onset of deformation at N=60 while the lighter isotopes up to N=58 are rather spherical. For the even Kr isotopes it could be shown that this onset of collectivity is fairly smooth. The nuclei with N=59 neutrons lie just at the border of these phenomena and are therefore of particular interest. In a study of fission fragments at the ILL an isomeric (7/2⁺) state in ⁹⁵Kr could be identified. The analysis of prompt gamma-radiation observed in DALI2 in coincidence with isomeric transitions identified in the EURICA array provides new information on the nuclear structure above the known isomeric state in ⁹⁵Kr.