Nuclear moments and isotope shifts of La-135, La-137, and La-138 by collinear laser spectroscopy
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abstract
The isotope shifts and hyperfine-structure-splitting constants of the [Formula presented] and [Formula presented] transitions of [Formula presented] have been measured by collinear laser-ion-beam spectroscopy for the accelerator-produced isotopes [Formula presented] and [Formula presented], and for the naturally occurring isotopes [Formula presented] and [Formula presented]. The magnetic moments of the ground states of the isotopes [Formula presented] and [Formula presented] have been determined to be [Formula Presented] and [Formula Presented], respectively, and the quadrupole moments to be [Formula Presented]. The ratio of the magnetic dipole coupling constants [Formula Presented] of the level [Formula presented] has shown a [Formula Presented] hyperfine anomaly with respect to the NMR ratio of the nuclear [Formula Presented] factors. The change in the mean-square nuclear charge radius determined from the isotope shift between [Formula presented] and [Formula presented] is [Formula Presented]. This value is smaller than the predictions made by the finite-range droplet model or by the Hartree-Fock plus BCS calculation. 2003 The American Physical Society.