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 Eu ci 4f⁷{(}⁸$S)5${d}⁹DJ, ... 6p(7/2;1/2)ⱼ and .... 6p(7/2;3/2)J were determined in enhanced accuracy. The ratio ¹⁵¹B/¹⁵³B=0.39184(22) (mean value) significantly deviates from values of muonic measurements but is in good agreement with other atomic one in Eu i and Eu ii. Values for the ratios of quadrupole moments are given.
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Möller et al. (1993) studied this question.
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