The Lz L, -Coster-Kronig transition probability fz3 in Nd was measured using multiparameter K-vs-L x-ray coincidence techniques. The Nd x rays were obtained from a radioactive source of ' 'Pm. High-energy-resolution germanium and silicon detectors were used to detect the K and L x rays, respectively. A method is described to correct for the very important contribution of Ka& x rays to the Kaz x-ray peak as well as for the small contribution of Ka2 x rays to the Ka& x-ray peak.The contribution of L g x rays to the measured Ka2-(La+ L g) coincidences was calculated and subtracted. The value obtained, fz3=0. 14620.005, is lower than that predicted (0.170) by the latest theoretical calculations, confirming a trend of deviations from theory recently observed in atoms of higher atomic number. It differs, however, from another recently reported value of 0. 123+0.013.
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