Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Structure and Dynamics of Nuclei III

HK 22.4: Vortrag

Dienstag, 28. März 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 T_z = -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.