Abstract
The electric quadrupole hyperfine structure splitting constants B of the Eu isotopes 145-147, 151-153 were measured with collinear laser ion beam spectroscopy in 17 different transitions. From 105 experimental data B values of all levels in EuII 4f 7 ( 8 S)5d 9 D J ,...6p(7/2;1/2) J , and...6p(7/2;3/2) J were determined in enhanced accuracy. The ratio 151 B/ 153 B=0.39184(22) (mean value) significantly deviates from values of muonic measurements but is in good agreement with other atomic ones in Eu I and Eu II
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