The first spectroscopy of excited states in Ni52 (T=-2) and Co51 (T=-3/2) has been obtained using the highly selective two-neutron knockout reaction. Mirror energy differences between isobaric analogue states in these nuclei and their mirror partners are interpreted in terms of isospin nonconserving effects. A comparison between large-scale shell-model calculations and data provides the most compelling evidence to date that both electromagnetic and an additional isospin nonconserving interactions for J=2 couplings, of unknown origin, are required to obtain good agreement.
|Number of pages||5|
|Journal||Physical Review Letters|
|Publication status||Published - 16 Aug 2013|