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We have measured and propose a model for switching rates in hystereticDC-SQUID in the regime where phase diffusion processes start to occur. We showthat the switching rates in this regime are smaller than the rates given byKramers' formula due to retrapping of Josephson phase. The retrapping process,which is affected by the frequency dependent impedance of the environment ofthe DC-SQUID, leads to a peaked second moment of the switching distribution asa function of temperature. The temperature where the peaks occur areproportional to the critical current of the DC- SQUID.Comment: 4 pages, 4 figure

Crossover from Kramers to phase-diffusion switching in moderately damped Josephson junctions