Large odd-even staggering in the very light platinum isotopes from laser spectroscopy

• Published in: AIP conference proceedings Vol. 455; no. 1
• Main Authors: Le Blanc, F., Obert, J., Oms, J., Putaux, J. C., Roussiere, B., Sauvage, J., Pinard, J., Cabaret, L., Duong, H. T., Crawford, J. E., Lee, J. K. P., Genevey, J., Girod, M., Peru, S., Huber, G., Krieg, M., Sebastian, V., Lettry, J., Lunney, D., Zemlyanoi, S.
• Format: Journal Article
• Language: English
• Published: United States 21.12.1998
• Subjects: ALPHA DECAY; ENERGY-LEVEL TRANSITIONS; HARTREE-FOCK METHOD; HYPERFINE STRUCTURE; LASER SPECTROSCOPY; MAGNETIC MOMENTS; NEUTRONS; NUCLEAR DEFORMATION; NUCLEAR FORCES; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR RADII; NUCLEAR STRUCTURE; PLATINUM 178; PLATINUM 180; PLATINUM 182; PLATINUM 183; QUADRUPOLE MOMENTS; VARIATIONS
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.57390

Laser spectroscopy measurements have been carried out on very neutron-deficient platinum isotopes with the COMPLIS experimental set-up on line with the ISOLDE-Booster facility. For the first time, Hg {alpha}-decay was exploited to extend the very light platinum chain. Using the 5d{sup 9}6s {sup 3}D{sub 3}{yields}5d{sup 9}6p {sup 3}P{sub 2} optical transition, hyperfine spectra of {sup 182,181,180,179,178}Pt and {sup 183}Pt{sup m} were recorded for the first time. The variation of the mean square charge radius between these nuclei, the magnetic moments of the odd isotopes and the quadrupole moment of {sup 183}Pt{sup m} were thus measured. A large deformation change between {sup 183}Pt{sup g} and {sup 183}Pt{sup m}, an odd-even staggering of the charge radius and a deformation drop from A=179 are clearly observed. All these results are discussed and compared with microscopic theoretical predictions using Hartree-Fock-Bogolyubov calculations using the Gogny force.