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Hyperfine structures and isotope shifts of the transition Eu II 4f7(8S~/2)6P3/2 (7/2,3/2) 4 -4f 7

On [he IRIS facilify the new neutron deficient 157,158'160,161,163Lu isotopes have been produced in spallation induced by 1 GeV protons on a tungsten or tantalum target, and identified by mass separation and the subsequent decay spectroscopy (X-, gamma-, and alpha ray spectroscopy).

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The isomer shift in the optical transition Eu II 4f7(8S~/2)6P3/2 (7/2,3/2/4 -4f7(Ss~/2)5d 9D~ , t = 604.95 rim, has been measured between the isotope 152gEu(3-) and its isomer 152mgu(O-). From the value ~(152gEu) -~(152mEu) = 736(10) Ms the deformation parameter of 152mEu has been estimated to be 152m~ ~ +0.25. This value is smaller than 152g6 as obtained from isotope shift measurements and the spectroscopic quadrupole moment. The influence of the shape difference on the decay of 152mEu is discussed.