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Isotope shift spectroscopy with narrow optical transitions provides abenchmark for atomic structure calculations and has also been proposed as a wayto constrain theories predicting physics beyond the Standard Model. Here, wehave measured frequency shifts of the ${^1}S_0 \rightarrow {^3}P_1$ and${^1}S_0 \rightarrow {^3}P_0$ transitions between all stable isotopes ofstrontium relative to ${^{88}}$Sr. This includes the first reportedmeasurements of the ${^1}S_0 \rightarrow {^3}P_0$ isotope shift of${^{88}}$Sr-${^{86}}$Sr and ${^{88}}$Sr-${^{84}}$Sr. Using the isotope shiftmeasurements of the two transitions, a King plot analysis is performed. Theseresults, combined with other recent isotope shift measurements in other atomicsystems, will help refine atomic structure calculations and theoreticalpredictions for new physics.

Isotope-shift spectroscopy of the ${^1}S_0 \rightarrow {^3}P_1$ and ${^1}S_0 \rightarrow {^3}P_0$ transitions in strontium