Improved measurement of the ${}^{44}{Ti}$ half-life from a 14-year long study

Authors:

The half-life of

{}^{44}{Ti}

was determined by following the decay of

{}^{44}{Ti}

and

{}^{60}{Co}

for 14 yr. Mixed sources containing

{}^{44}{Ti}

and

{}^{60}{Co}

and pure sources of

{}^{44}{Ti}

and

{}^{60}{Co}

were prepared and their γ-ray spectra were measured with a Ge spectrometer once or twice a year. Counts in the 1157.0-keV γ-ray photopeak of

{}^{44}{Ti}

and the 1173.2- and 1332.5-keV γ-ray photopeaks of

{}^{60}{Co}

were used for this measurement. From the decay of the

{}^{44}{Ti}

and

{}^{60}{Co}

activity ratios, the half-life of

{}^{44}{Ti}

was determined. Using a value of 5.2711±0.0004 yr for

{}^{60}{Co}

half-life, we determined the half-life of

{}^{44}{Ti}

as 58.9±0.3 yr. Special efforts were made to check for systematic errors and these were found to be negligible within the quoted uncertainty.

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Improved measurement of theTi44half-life from a 14-year long study