Abstract
The absoluteK-conversion coefficients of the 496 keV-124 keV cascadeγ-rays in131Cs have been determined from angular correlation experiments using a new approach. The value ofα K =0.0100±0.0007 obtained for the 496 keV transition is in excellent agreement with the theory whereas a strong case is presented for the existence of an anomalous nuclear-structure-dependent conversion coefficient for the 124 keV transition. TheK-conversion coefficient for this transition has been measured to be 0.742±0.077 giving a value of 1.25±0.13 for the ratioα (expet) K /α (theory) K . The result is interpreted as being due to the presence of electric monopole,E0, electron transition. A value of 0.26±0.14 has been obtained for theE0/E2 electron conversion ratio and the absolute value of the electric monopole matrix element has been determined to be 0.07±0.02.
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On leave from Pakistan Atomic Energy Commission, Karachi, Pakistan.
The authors gratefully acknowledge the support of the National Research Council of Canada and wish to thank Mr.David L.Salie for his critical reading of the manuscript.
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Sen, S.K., Rizvi, S.I.H. & Dohan, D.A. AnomalousK-conversion coefficient of the 124keV transition in131Cs. Z. Physik 209, 254–259 (1968). https://doi.org/10.1007/BF01380073
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DOI: https://doi.org/10.1007/BF01380073