Davies, P.J.Bentley, M.A.Henry, T.W.Simpson, EdwardGade, ALenzi, S.M.Baugher, T.Bazin, D.Berryman, J.S.Bruce, A MDiget, C. Aa2015-12-100031-9007http://hdl.handle.net/1885/60175The first spectroscopy of excited states in Ni52 (Tz=-2) and Co51 (Tz=-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. � 2013 American Physical Society.Author/s retain copyrightKeywords: Isospin; Knockout reactions; Mirror energy differences; Nonconserving; Atomic physics; Physics; Mirrors201310.1103/PhysRevLett.111.0725012016-02-24