Summary
The continuous γ spectrum due to bremsstrahlung associated with the orbital electron capture in 7132 Ge has been investigated with a scintillation spectrometer. The intensity distribution of the spectrum in the energy range between 50 keV and the upper limit of energy (E max = 220 ± 3 keV) was found to agree closely with the one calculated according to the theory developed byMorrison andSchiff. The ratio of the total number of bremsstrahlung quanta to the number ofK-captures in the interval of energy between 70 keV and the upper limit was (2.3 ± 0.5)·10−5, which also is in satisfactory agreement with the theoretical value. The half life of 7132 Ge was checked and found to be 12.5 ± 0.1 days. The type of transition is briefly discussed according to nuclear shell model. Some results concerning the decay of 7732 As which have been obtained during the present measure are also reported.
Riassunto
Con uno spettrometro a scintillazione si è studiato lo spettro γ continuo, dovuto alla bremsstrahlung interna, che accompagna la cattura elettronica orbitale del 7132 Ge. È stato trovato che la distribuzione d’intensità di tale spettro è in buon accordo con quella calcolata in base alla teoria di Morrison e Schiff per energie comprese tra circa 50 keV e il limite superiore (E max = 220 ± 3 keV). La probabilità di emissione di un quanto di bremsstrahlung, relativamente all’intervallo di energia dello spettro continuo compreso tra 70 keV e l’energia massima, è risultato essereN γ/N K = (2.3±0.5)·10-5 che è pure in buon accordo con quella prevista. Il periodo di dimezzamento del 7132 Ge è stato trovato uguale a 12.5 ± 0.1 giorni. La natura della transizione 7132 Ge → 7131 Ga è brevemente discussa in base al modello nucleare a shell. Alcuni dati relativi al decadimento 7732 As → 7734 Se, ricavati nel corso della presente misura, vengono riportati.
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Bisi, A., Germagnoli, E., Zappa, L. et al. On the energy distribution and the emission probability of internal bremsstrahlung in 7132 Ge. Nuovo Cim 2, 290–300 (1955). https://doi.org/10.1007/BF02855920
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DOI: https://doi.org/10.1007/BF02855920