Zusammenfassung
The nuclearg-factor of the 181 keV-level of Tc99 was determined by measuring the angular correlation of the 741 keV-181 keV gamma gamma cascade in an external magnetic field. The result,g=+1.44 ±0.13, yields a magnetic moment of 3.6 ±0.3 nuclear magnetons for the spin assignment 5/2. A study of the disintegration confirmed the known decay scheme but an additional gamma ray of 950 keV was found. Coincidence measurements proved that this γ-ray is a, transition to the 181 keV-level. A new determination of the half lifetime of the 181 keV-level confirmed the known value, but the limits of error were reduced to:T 1/2 = 3.57 ±0.05. 10−9. We measured the angular correlation function of the 741 keV-181 keV-cascade:
W(Θ)= 1 + (0.118 ±0.011) · P2 (cos Θ)-(0.003 ±0.008) · P4(cosΘ) and of the 741 keV-41 kev-140keV triple cascade:
W(Θ)= 1-(0.164 ±0.013) · P2(cosΘ) + (0.003 ±.007) · P4(cosΘ).
The source was prepared as ammonium molybdate in liquid solution. Delayed coincidence measurements showed weak perturbations by internal fields. The results are discussed.
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Wir danken Herrn Professor W.Jentschke für Anregung, Diskussion und großzügige Förderung dieser Arbeit. Die Herren F.Frisius und D.Hovestadt halfen uns tatkräftig während der Messungen. Wir verdanken Herrn Dr.Stuckenberg zahlreiche Ratschläge beim Bau der Elektronik. Das Bundesministerium für Atomkernenergie förderte diese Arbeit durch großzügige Bereitstellung finanzieller Mittel. Schließlich möchten wir den Herren S.Raboy und V.E.Krohn herzlich danken für die Mitteilung ihrer Resultate vor der Veröffentlichung.
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Bodenstedt, E., Matthias, E. & Körner, H.J. Das magnetische Moment des I8I keV-Niveaus von Technetium 99. Z. Physik 153, 423–439 (1959). https://doi.org/10.1007/BF01337609
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DOI: https://doi.org/10.1007/BF01337609