The abundances of seven 171 W γ-rays (four definite and three tentative assignments) and a half-life have been measured. The assignment of several photons to 171 Ta decay has been confirmed, as has the half-life, and another photon associated with this decay is proposed. The assignment of a six minute half-life to 171 Ta is refuted. In addition two γ-rays are proposed for 171 Re decay and an upper limit on the half-life is given. The technique used is a relative one based on extrapolation from known γ-ray abundances in a mass chain. The isotopes were produced by the reactions: 165 Ho ("0, 10n) 171 Re and 165 Ho( 14 N, 8n)' 71 W by bombarding thin Ho foils. The activity was collected using a He jet recoil transportation system. Ge(Li) spectra were recorded and spectrum summation techniques were used to improve the data. The growth and decays of the daughter products were observed.
The absolute γ-ray abundances have been measured for twelve 7-rays of 174 W and three 7-rays of 174 Re.The isotopes were produced by the reactions: 165 Ho("0,7n) l,4 Re; 165 Ho( 14 N,5n) 174 W using thin Ho foils. The activity was collected by means of a helium jet transportation system. Ge(Li) spectra of the products were recorded and the growths and decays of the daughter isotopes were observed.
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