Precise Measurements of Muonic Isotope Shifts for 29 Nuclides, in Particular, for the Ca Isotopes 40, 42, 44, and 48

Abstract

Precise measurements of the isotope shift for muonic $K$ transitions are reported for ${\mathrm{Si}}^{28,29,30}$, ${\mathrm{K}}^{40,41}$, ${\mathrm{Ca}}^{40,42,44,48}$, ${\mathrm{Fe}}^{54,56,57}$, ${\mathrm{Ni}}^{58,60,61,62}$, ${\mathrm{Cu}}^{63,65}$, ${\mathrm{Sr}}^{86,87,88}$, ${\mathrm{Zr}}^{90,92}$, and ${\mathrm{Sn}}^{116,117,118,119,120,122}$. The shifts ${\mathrm{Ca}}^{40}$-${\mathrm{Ca}}^{44}$ and ${\mathrm{Ca}}^{40}$-${\mathrm{Ca}}^{48}$ are of special interest, as they confirm the conclusions from electron scattering. The shifts ${\mathrm{Sr}}^{86}$-${\mathrm{Sr}}^{87}$ and ${\mathrm{Sr}}^{86}$-${\mathrm{Sr}}^{88}$ are found to be negative, indicating that the heavier isotope has a smaller charge radius.