Coulomb energy differences in T=1 mirror rotational bands in Fe-50 and Cr-50 - art. no. 122501

Gamma rays from the N = Z - 2 nucleus Fe-50 have been observed, establishin g the rotational ground state band up to the state J(pi) = 11(+) at 6.994 M eV excitation energy. The experimental Coulomb energy differences, obtained by comparison with the isobaric analog states in its mirror Cr-50, confirm the qualitative interpretation of the backbending patterns in terms of suc cessive alignments of proton and neutron pairs. A quantitative agreement wi th experiment has been achieved by exact shell model calculations, incorpor ating the differences in radii along the yrast bands, and properly renormal izing the Coulomb matrix elements in the pf model space.