Precise measurements of the isotope shift for muonic K transitions are reported for Si28,29,30, K40,41, Ca40,42,44,48, Fe54,56,57, Ni58,60,61,62, Cu63,65, Sr86,87,88, Zr90,92, and Sn116,117,118,119,120,122. The shifts Ca⁴⁰-Ca⁴⁴ and Ca⁴⁰-Ca⁴⁸ are of special interest, as they confirm the conclusions from electron scattering. The shifts Sr⁸⁶-Sr⁸⁷ and Sr⁸⁶-Sr⁸⁸ are found to be negative, indicating that the heavier isotope has a smaller charge radius.
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Ehrlich et al. (1967) studied this question.
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