Abstract
The mass of the $N=Z$ nucleus $_{32}^{64}\mathrm{Ge}$ has been measured by determining the positron endpoint energy from the prominent decay to the 427-keV state in $^{64}\mathrm{Ga}$. The $^{54}\mathrm{Fe}(^{12}\mathrm{C},2n)^{64}\mathrm{Ge}$ reaction was used to produce $^{64}\mathrm{Ge}$, at a bombarding energy of 36 MeV. Off-line ${\ensuremath{\beta}}^{+}\ensuremath{-}\ensuremath{\gamma}$ coincidences were studied, as well as the half-life of the 427-keV transition. The half-life was observed to be 70 \ifmmode\pm\else\textpm\fi{} 7 sec, in agreement with a previous measurement. The observed endpoint energy was 2.96 \ifmmode\pm\else\textpm\fi{} 0.25 MeV, leading to a total decay energy of 4.41 \ifmmode\pm\else\textpm\fi{} 0.25 MeV, and a mass excess of -54.43 \ifmmode\pm\else\textpm\fi{} 0.25 MeV for $^{64}\mathrm{Ge}$. Implications for nucleosynthesis and the solar system abundance of $^{64}\mathrm{Zn}$ are discussed.
Published Version
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