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Mirror energy differences (MED) and triplet energy differences (TED) in theT=1 analogue states are important probes of isospin-symmetry breaking. Inspiredby the recent spectroscopic data of 66Se, we investigate these quantities forA=66-78 nuclei with large-scale shell-model calculations. For the first time,we find clear evidences suggesting that the isospin nonconserving (INC) nuclearforce has a significant effect for the upper fp shell region. Detailed analysisshows that in addition to the INC force, the electromagnetic spin-orbitinteraction plays an important role for the large, negative MED in A=66 and 70and the multipole Coulomb term contributes to the negative TED in all the T=1triplet nuclei. The INC force and its strength needed to reproduce theexperimental data are compared with those from the G-matrix calculation usingthe modern charge-dependent nucleon-nucleon forces.

Isospin nonconserving interaction in the T=1 analogue states of the mass-70 region