RADIATIVE DECAYS OF DECUPLET HYPERONS

We calculate the radiative decay widths of decuplet hyperons in a chir al constituent quark model including electromagnetic exchange currents between quarks. Exchange currents contribute significantly to the E2 transition amplitude, while they largely cancel for the M1 transition amplitude. Strangeness suppression of the radiative hyperon decays is found to be weakened by exchange currents. Differences and similaritie s between our results and other recent model predictions are discussed .