Decay of 13.2-h ${}^{87 m}Y$ , 80.3-h ${}^{87 g}Y$ , and 2.83-h ${}^{87 m}{Sr}$

The decays of

{}^{87 m}{Sr}

and the isomers of

{}^{87}Y

have been investigated using Ge(Li) and Si(Li)

γ

- and x-ray detectors and a Si(Li) electron and positron detector. Half-lifes of 13.2±0.2, 80.3±0.3, and 2.83±0.05 h have been determined for

{}^{87 m}Y

{}^{87 g}Y

, and

{}^{87 m}{Sr}

, respectively. Positron branching has been observed from

{}^{87 m}Y

with an intensity of 0.75% to the ground state of

{}^{87}{Sr}

, and from

{}^{87 g}Y

{}^{87 m}{Sr}

with an intensity of 0.16%. The maximum

β^{+}

energy in the decay of

{}^{87 m}Y

was determined to be 1150±40 keV. The electron-capture branch from

{}^{87 m}{Sr}

{}^{87}{Rb}

has been measured as 0.30±0.08%.

Log ft

values have been computed and

β

-decay hindrances discussed. The systematic variations in

M 4

half-lives are also discussed.

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Decay of 13.2-hY87m, 80.3-hY87g, and 2.83-hSr87m