Measurement of the Hf 175 half-life

Résumé fourni par la source

Hafnium-175 is a useful radioisotope for numerous applications; however, its evaluated half-life ($70\ifmmode\pm\else\textpm\fi{}2\phantom{\rule{0.16em}{0ex}}\mathrm{days}$) has a large uncertainty. To enable a new measurement of the half-life, $^{175}\mathrm{Hf}$ was produced via proton irradiation of natural lutetium and chemically purified. The $^{175}\mathrm{Hf}$ sample was counted approximately once a month with three high-purity germanium detectors for 13 months ($\ensuremath{\sim}5.5$ half-lives). A $^{133}\mathrm{Ba}$ standard was counted in an identical manner to quantify systematic uncertainties over the measurement period. The measured $^{175}\mathrm{Hf}$ half-life is $69.90\ifmmode\pm\else\textpm\fi{}0.07$ days, in agreement with the evaluated value, but with significantly reduced uncertainty.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.