NUSPIN 2017

Nuclei in the vicinity of the N=Z line around A=70 through the proton drip-line exhibit very rapid shape changes due to the isospin symmetry breaking related to charge effects. This leads to differences in excitation energy between analogue states in isobaric multiplets. We have performed a Coulomb excitation experiment of 70Kr in order to measure the B(E2;0 + →2 + ) value for the first time. The experiment was performed at the Radioactive Isotope Beam Factory (RIBF). The 78Kr primary beam at 345 MeV/nucleon was impinging on 9Be target. The BigRIPS fragment separator was used in order to deliver the 70Kr and isotopes at around 150MeV/nucleon to the secondary target for Coulomb excitation and inelastic scattering measurements. The emitted gamma-rays of the reaction were detected by DALI2 array and recoils were identified by the ZeroDegree Spectrometer. Results will allow to make a direct comparison with the mirror nucleus 70Se and will give an important new information about shape co-existence across the N=Z line. The chain for the experimental knowledge on Kr isotopes was extended with this study and compared it with theoretical calculations. Results also allow to make a direct comparison with 70Se which gives important new information about the shape coexistence phenomenon, the existence of two stable shapes at the same excitation energies, across the N=Z line. Additionally, the mirror energy differences of Tz=1 isobaric analogue states for 70Kr with respect to its mirror 70Se and triple energy differences of the multiplet were probed by including the 70Br isotope in the analysis.