| Abstrakt: |
L-M coincidence measurements were made on x rays from the radioactive decays of96244Cm,94238Pu, and92232U. The observation ofM x rays in coincidence with theL3N4, 5 transition indicates that the onset of theL2-L3M5 Coster-Kronig transition takes place atZ=91 or 92. The measured ratio of theM x-ray counting rates, coincident with theL3N4, 5 andL2M4 transitions, establishes that both theL2-L3M4 and theL2-L3M5 transitions are energetically possible forZ?94, but the results do not rule out the possibility that these transitions begin as low asZ=92. The measurement ofL-M x-ray coincidences, together with relative Coster-Kronig electron intensities from theory or experiment, provides a new way to measure the totalL2-L3 Coster-Kronig transition probability,f23, at highZ for radioactive sources where the primary vacancies are created primarily in theL2 andL3 subshells. The present result atZ=94 indicates that the theoretical calculations of McGuire of the relative partial Coster-Kronig transition rates forL2-L3M4,5 are accurate to within 10 percent. |
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