Abstract

The ratio of the nuclear electric quadrupole frequencies of the two gallium isotopes has been measured in two forms of metallic gallium. The experimental and theoretical values of the deduced quadrupole anomaly, as defined by Pyykko (1970), imply that the electric field gradient in alpha-gallium is negative whereas in beta-gallium it is positive. The quadrupole moment ratio of the gallium-69 and gallium-71 isotopes has been determined by a precision measurement of the quadrupole frequencies in GaCl3 where the pseudoquadrupole interaction is presumed to be small.

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