Auger Effect in the Heaviest Elements

The Auger effect in the heaviest elements has been investigated with magnetic beta-ray spectrometers.

K

-Auger yields for ytterbium, polonium, and uranium of 0.064±0.01, 0.058±0.005, and 0.033±0.010, respectively, were obtained. The

K

-Auger electrons of ytterbium and polonium were resolved into two groups,

K - L L

and

K - L X

, according as two or one

L

electrons were involved. The ratios of the intensities of the

K - L X

electrons to the

K - L L

electrons for ytterbium and polonium were found to be 0.64±0.05 and 0.55±0.03, respectively. A summary of measurements of

K

-fluorescence yields and

K

-Auger electron intensity ratios is given. A revised decay scheme for

{Np}^{236}

and a redetermination of the half-life of

{At}^{211}

(7.20±0.05 hours) is included.

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