Feb 6 – 8, 2006
CERN
Europe/Zurich timezone

Resonance laser spectroscopic studies of neutron deficient rare earth isotopes at the IRIS facility

Feb 7, 2006, 12:15 PM
20m
Council Chamber, 503/1-001 (CERN)

Council Chamber, 503/1-001

CERN

CH-1211 Geneva 23

Speaker

Anatoly Barzakh (Petersburg Nuclear Physics Institute)

Description

The laser ion source has been used for the study of the isotope shifts of neutron deficient Eu and Gd isotopes at the IRIS facility. The region of the applicability of the method by using the gamma- and beta- radiation detection has been extended. The isotope shifts of the europium optical line 576.520 nm for 137–139, 141, 142m, 143, 144 Eu and the gadolinium optical line 569.622 nm for 145, 145m, 143m Gd have been measured. To increase the laser ion source efficiency an axial magnetic field (350 Gauss) was applied. For Gd atoms investigation resonance ionization directly inside the target has been applied for the first time. Changes in mean square charge radii for 145, 145m, 143 Gd and 137 Eu and magnetic moments for 145, 145m Gd have been determined for the first time. The new data for 137 Eu and refined data for 138 Eu point to a gradual increase of the deformation for these isotopes rather than the jump-like behaviour predicted by the microscopic- macroscopic calculations. The influence of the proton sub-shell closure Z=64 on the deformation behaviour at N<82 has not been observed in contrast with the region at N>82.

Primary author

Anatoly Barzakh (Petersburg Nuclear Physics Institute)

Co-author

Vladimir Panteleev (Petersburg Nuclear Physics Institute)

Presentation materials