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1266-keV gamma branch in 31Si decay.

We have measured the absolute gamma-ray intensity, i.e., [gamma]'s per 100 parent decays, of the 1266-keV line produced in [sup 31]Si decay using neutron activation and delayed photon spectroscopy. Its value was determined to be 0.050[plus minus]0.004%. This result is lower than the only previously reported value of 0.07, which was given without an uncertainty. In a separate experiment to validate the method of measurement and analysis, the gamma-ray intensity of the 1779-keV line of [sup 28]Al was determined to be 98[plus minus]8.8%, in good agreement with its adopted value of 100%.