Shape coexistence and isospin symmetry in A = 70 nuclei: Spectroscopy of the Tz = −1 nucleus 70Kr

Excited states in the $T_z=-1$ nucleus ⁷⁰Kr have been populated using inelastic scattering of a radioactive ⁷⁰Kr beam as well as one- and two-neutron removal reactions from ^71,72Kr at intermediate beam energies. The level scheme of ⁷⁰Kr was constructed from the observed γ-ray transitions and coincidences. Tentative spin and parity assignments were made based on comparison with the mirror nucleus ⁷⁰Se. A second $2^{+}$ state and a candidate for the corresponding $4_2^{+}$ state suggest shape coexistence in ⁷⁰Kr.