Abstract
The hyperfine structure of the ground state 4
f
7
6
s
2
8
S
7/2
of
151
Eu and
153
Eu has been measured by the method of magnetic resonance in an atomic beam. The sign of the hyperfine structure and the value of
g
J
have also been measured. The results are:
g
J
= 1·9935 ± 0·0003;
A
(151) = -20·0523 ± 0·0002 Mc/s,
A
(153) = -8·8532 ± 0·0002 Mc/s,
B
(151) = - 0·7012 ± 0·0035 Mc/s,
B
(153) = - 1·7852 ± 0·0035 Mc/s;
A
(151)/
A
(153) = 2·26498 ± 0·00008,
B
(151)/
B
(153) = 0·393 + 0·003. These results disagree with the values expected for the pure
8
S
7/2
state formed from a half-filled shell of
f
-electrons. Calculations on the basis of admixture of higher states of the configuration by spin-orbit coupling account for the discrepancy in
g
J
but do not explain the values of the hyperfine structure constants
A
and
B
. Further theoretical work is in progress.
Cited by
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