The 2+2 and 4+1 states of the even isotopes 78–86Kr excited in the inelastic scattering of 51.9 MeV protons

The 2+2 and 4+1 states of the even isotopes 78–86Kr have been studied by the inelastic scattering of protons. The B(E2;0+g → 2+2) values of these isotopes are roughly equal, where as the B(E4;+g → 4+1) values decrease to a minimum at 82Kr and then increase with neutron number. Comparison of the experimental results with current theoretical models implies an abrupt change of structure between 78–82Kr and 84–86Kr.