Mesure des vies moyennes de niveaux excités de l'ytterbium 170, du hafnium 177 et du lutécium 175

Lifetime measurements in the odd−A nucleus Hf177

“…Our measurement of the 9/2 + level lifetime differs considerably, by about 5σ , from the recommended value in the last ENSDF evaluation: 960( 23) ps [14]. The latter is based on a weighted average of five mutually consistent measurements [1,[24][25][26][27]. It is unusual to find such a large discrepancy from a well-established value, which renders a closer inspection of possible reasons necessary.…”

“…Berlovich et al [24] and Rougny et al [25] used 177 g Lu sources and measured β-γ coincidences between a plastic scintillator detecting the beta and a NaI(Tl) scintillator detecting the depopulating 208 keV γ -ray, respectively. They found lifetimes of 995(43) ps and 938(87) ps.…”