Abstract
The isotope shift of the stable151Eu,153Eu, and the radioactive152Eu,154Eu isotopes and the hyperfine splitting of the152Eu isotope was investigated using a digital recording Fabry-Perot-spectrometer. From isotope shift measurements on the line λ 5 765 A (4f7 6s 6p z6P7/2-4f7 6s2 a8S7/2) the relative isotope shift was derived:151Eu:0;152Eu: 0.923(8);153Eu: 1;154Eu: 1.197(8). The results show that there is a strong increase in the change of the mean square nuclear charge radius δ〈r2〉 when only one neutron is added to the 88 neutrons of the151Eu nucleus, whereas the change of δ〈r2〉 between152Eu and153Eu is of the same order of magnitude as that between153Eu and154Eu. From the hyperfine splitting of the radioactive isotope152Eu in the line δ 6865 A (4f76s 6p z10P9/2-4f7 6s2 a8S7/2) the sign of the magnetic dipole moment μI(152Eu) was found to be negative, and with this result and earlier experimental data the signs of the nuclear quadrupole momentsQ(152Eu) andQ (154Eu) could be determined to be positive.
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