The shape of exotic even-mass Pb182-190 isotopes was probed by measurement of optical isotope shifts providing mean square charge radii (delta <r(2)>). The experiment was carried out at the ISOLDE (CERN) on-line mass separator, using in-source laser spectroscopy. Small deviations from the spherical droplet model are observed, but when compared to model calculations, those are explained by high sensitivity of delta <r(2)> to beyond mean-field correlations and small admixtures of intruder configurations in the ground state. The data support the predominantly spherical shape of the ground state of the proton-magic Z=82 lead isotopes near neutron midshell (N=104).
|Article number||ARTN 112502|
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - 16 Mar 2007|
- INTRUDER STATES
- ATOMIC SPECTROSCOPY
- ISOLDE RILIS