Spectroscopy of proton-rich 66Se up to Jπ = 6+: isospin-breaking effect in the A = 66 isobaric triplet
Abstract
Candidates for three excited states in the 66Se have been identified using the recoil-β tagging method together with a veto detector for charged-particle evaporation channels. These results allow a comparison of mirror and triplet energy differences between analogue states across the A = 66 triplet as a function of angular momentum. The extracted triplet energy differences follow the negative trend observed in the f7/2 shell. Shell-model calculations indicate a continued need for an additional isospin non-conserving interaction in addition to the Coulomb isotensor part as a function of mass.
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