X-ray isotope shifts and nuclear radii in Sm

Abstract

The isotope shifts have been measured for the K α 1 X rays of six Sm isotopes. From the observations the following variations of the mean square nuclear charge radii, δ〈 r 2〉, are obtained in units fm 2, 147–148Sm: 0.171 ± 0.010, 148–149Sm: 0.080 ± 0.008; 148–150Sm: 0.303 ± 0.010; 150–152Sm : 0.411 ± 0.012, 152–154Sm: 0.221 ± 0.013. A comparison with optical measurements is presented.