Hyperfine interactions in the <i>J</i> = 5 states of ¹⁴⁷Sm and ¹⁴⁹Sm

Abstract

The hyperfine interaction constants A k (5) have been measured in 147 Sm and 149 Sm. Consideration of the k = 2 results together with Woodgate's values of A 2 (J) for J = 1 to 4 shows that his nonrelativistic treatment of the electric quadrupole interaction in samarium is inadequate but that a relativistic one gives excellent agreement. The effect cannot be confused with a possible configuration interaction as it can in the case of the magnetic dipole interaction. Allowance for the effects of octupolelike second-order corrections and more precise computation of the dipole- and quadrupole-like corrections markedly affect the published results for the hyperfine constants in the lower J states, but the revision does not improve the agreement with the theoretical expressions. It would appear that Conway and Wybourne's analysis of the breakdown of L–S coupling in the nominally 7 F ground term is not adequate, particularly for the computation of the coefficient of the sC 2 term.