The optical isotope shift in the 6$s^2$-6s6p (λ=460 nm) atomic resonance transition of ${}_{}{}^{82}{}_{}{}^{}\mathrm{Sr}$ ($t_{1/2}$=24 d) has been measured to be 418(2.5) MHz. The weak atomic beam of ${}_{}{}^{82}{}_{}{}^{}\mathrm{Sr}$ was detected using the photon burst technique. The extracted value for the change in nuclear mean square radius is compared to predictions using the droplet model.

• Received 12 May 1986

DOI:https://doi.org/10.1103/PhysRevC.34.1120