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.
Author
Anatoly Barzakh
(Petersburg Nuclear Physics Institute)
Co-author
Vladimir Panteleev
(Petersburg Nuclear Physics Institute)
