Reduced electromagnetic transition matrix elements were determined for
levels in Al-26 from the ground state to 8 MeV. In this energy region
in Al-26, states with isospin 0 and 1 coexist, and isospin is approxi
mately 97% conserved. These data provide the first test of the effect
of symmetry breaking on the transition matrix element distribution. Th
e experimental distribution deviates significantly from the Porter-Tho
mas distribution. (C) 1998 Elsevier Science B.V.