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Measurements of the loss rates for strontium n$^{3}$S$_{1}$ Rydberg atomsexcited in a dense BEC are presented for values of principal quantum number $n$in the range $49\lesssim n \lesssim 150$ and local atom densities of $\sim1$ to$3\times10^{14}$cm$^{-3}$. Two main processes contribute to loss, associativeionization and state-changing. The relative importance of these two losschannels is investigated and their $n$- and density-dependences are discussedusing a model in which Rydberg atom loss is presumed to involve a closecollision between the Rydberg core ion and ground-state atoms. The presentmeasurements are compared to earlier results obtained using rubidium Rydbergatoms. For both species the observed loss rates are sizable,$\sim10^{5}-10^{6}$s$^{-1}$, and limit the time scales over which measurementsinvolving Rydberg atoms immersed in quantum degenerate gases can be conducted.

Loss rates for high-$n$, $49\lesssim n \lesssim150$, 5sns($^{3}$S$_{1}$) Rydberg atoms excited in an $^{84}$Sr Bose-Einstein condensate