Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Structure and Dynamics of Nuclei III
HK 22.4: Talk
Tuesday, March 28, 2017, 15:00–15:15, F 2
Shape coexistence in 70Kr — •Tugba Arici1, Kathrin Wimmer2, Wolfram Korten3, Juergen Gerl1, and Pieter Doornenbal4 — 1GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt, Germany — 2Department of Physics, University of Tokyo, Japan — 3CEA Saclay, IRFU, SphN, France — 4RIKEN Nishina Center, Saitama, Japan
Nuclei in the vicinity of the N = Z line around A = 70 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. In this study we probed Coulomb energy differences in the Tz = -1 nucleus 70Kr with respect to its mirror 70Se. In 70Kr, no spectroscopic information is available so far. We have performed a Coulomb excitation experiment of 70Kr and 72Kr isotopes to measure the B(E2) value. The experiment was performed at the Radioactive Isotope Beam Factory (RIBF). A 78Kr primary beam at 345 MeV/nucleon was impinging on a Be target. The BigRIPS fragment separator was used in order to deliver the 70Kr and 72Kr isotopes at around 150 MeV/nucleon to the secondary target for Coulomb excitation and inelastic scattering measurements. The emitted gamma-rays of the reaction were detected by the 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 important new information about shape coexistence across the N = Z line.