Summary
The relative intensities of a number of internal conversion lines in the decay of197Hg were determined rather accurately and compared with theoretical values. In general the agreement with static finite size corrected values is very good. It is found, however, that the theoreticalM-shell coefficients are too large by about 40% in the cases studied. This is attributed to the neglect of the screening effect in the calculations. For the well-known 77.5 keV (M1+E2) transition in197Au the mixing ratio was found to be (9.4±0.9)%E2, and the corrections which have to be applied to the point-nucleus coefficients forM1 conversion in theL 1 andL 11 shells are 0.75±0.11 and 0.80 +0.29−0.24 respectively. These corrections are exactly those found if the « static » finite nuclear size effect is taken into account, and therefore indicate the absence of any structure dependent (« dynamic ») effect in this case.
Riassunto
Si sono accuratamente determinate e confrontate coi valori teorici le intensità relative di molte righe di conversione interna del decadimento197Hg. In genere l’accordo coi valori statici finiti corretti è assai buono. Si trova, tuttavia, che i coefficienti teorici dello stratoM nei casi esaminati sono eccedenti per circa il 40%. Ciò si attribuisce all’aver trascurato nei calcoli l’effetto di schermo. Per la ben nota transizione (M1+E2) di 77.5 keV nel197Au il rapporto di miscela fu trovato essere (9.4±.09)%E3 e le correzioni da applicare ai coefficienti del nucleo puntiforme per la conversioneM1 negli stratiL 1 eL 11 sono, rispettivamente, 0.75±0.11 e 0.80 +0.29−0.24 . Tali correzioni sono esattamente quelle trovate tenendo conto dell’effetto «statico» della dimensione finita del nucleo e indicano quindi l’assenza in questo caso di ogni effetto dipendente dalla struttura (« dinamico »).
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van Heerden, I.J., Reitmann, D. & Schneider, H. The internal conversion spectra from the decay of197Hgm . Nuovo Cim 11, 167–177 (1959). https://doi.org/10.1007/BF02859711
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DOI: https://doi.org/10.1007/BF02859711