CHANGE OF MEAN SQUARE NUCLEAR CHARGE RADIUS IN ROTATIONAL EXCITATION

Isomer shifts of γ rays from rotational bands of deformed nuclei have been determined in Mössbauer effect measurements. The following changes of the mean square nuclear charge radii have been deduced:Δ〈r2〉(156Gd, 89keV)=(+2.6±0.8)·l0-3fm2, Δ〈r2〉(170Yb, 84keV)=(+1.2±0.3)·10-3fm2, Δ〈r2〉(171Yb, 67keV)=(+1.1±0.2)·10-3fm2. The results are compared with theoretical calculations and additional experimental data, to study the effect of the Coriolis and centrifugal forces in rotational excitation on the motion of the nucleons. © 1969 Springer-Verlag.