Probing isospin symmetry in the (Fe 50, Mn 50, Cr 50) isobaric triplet via electromagnetic transition rates PROBING ISOSPIN SYMMETRY in the (Fe 50, Mn 50, Cr 50 ⋯ M. M. GILES et al

Lifetimes of the T=1 isobaric analog Iπ=2+ states in Mn50 and Cr50 were measured simultaneously by employing the recoil distance Doppler-shift (RDDS) technique. The states were populated in a fusion-evaporation reaction with a C12 beam on a Ca40 target. An analysis of the data and the calculations from the present work, together with the available B(E2:2+→0+) data of the isobaric analog states in Fe50 and Cr50, were used to study isospin symmetry in the three A=50 isobaric nuclei. Shell-model calculations reproduce the magnitudes as well as the increasing trend of the B(E2) data with increasing Z. To draw a firm conclusion on the level of isospin mixing in the triplet, a new precision measurement of the 2+→0+ transition rate in Fe50 will be required.