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Neutron-deficient isotopes Ge 64 and Ge <mml:…

1974; American Institute of Physics; Volume: 9; Issue: 5 Linguagem: Inglês

10.1103/physrevc.9.1801

1538-4497

R. G. H. Robertson, Sam M. Austin,

Electron and X-Ray Spectroscopy Techniques

The ${\ensuremath{\beta}}^{+}$ decays of $^{65}\mathrm{Ge}$ and the new isotope $^{64}\mathrm{Ge}$ have been studied by $\ensuremath{\gamma}$-ray spectrometry with chemically separated sources. Measured half-lives are 30.0 \ifmmode\pm\else\textpm\fi{} 1.2 sec for $^{65}\mathrm{Ge}$ and 63.7 \ifmmode\pm\else\textpm\fi{} 2.5 sec for $^{64}\mathrm{Ge}$. The decay-scheme studies have been supplemented by investigation of the $^{64}\mathrm{Zn}(p,n\ensuremath{\gamma})^{64}\mathrm{Ga}$ and $^{64}\mathrm{Zn}(^{3}\mathrm{He},t)^{64}\mathrm{Ga}$ reactions, and the mass excess of $^{64}\mathrm{Ga}$ was found to be -58.819 \ifmmode\pm\else\textpm\fi{} 0.008 MeV. Excitation functions for the ($^{3}\mathrm{He},2n$), ($^{3}\mathrm{He},3n$) and ($^{3}\mathrm{He},p2n$) reactions induced on $^{64}\mathrm{Zn}$ are presented for comparison with other work. The question of the role of $^{64}\mathrm{Ge}$ in nucleosynthesis is considered.[RADIOACTIVITY $^{64,65}\mathrm{Ge}[\mathrm{by} ^{64}\mathrm{Zn}(^{3}\mathrm{He},xn)]$; measured ${T}_{\frac{1}{2}}$, ${E}_{\ensuremath{\gamma}}$, ${I}_{\ensuremath{\gamma}}$; deduced ${I}_{\ensuremath{\beta}}$, $log\mathrm{ft}$. $^{64,\phantom{\rule{0ex}{0ex}}65}\mathrm{Ga}$, deduced levels, $J$, $\ensuremath{\pi}$; Ge(Li) detector. NUCLEAR REACTIONS $^{64}\mathrm{Zn}(p,n\ensuremath{\gamma})$, $E=7.8\ensuremath{-}9.5$ MeV; measured ${E}_{\ensuremath{\gamma}}$. $^{64}\mathrm{Ga}$ deduced levels. $^{64}\mathrm{Zn}(^{3}\mathrm{He},t)$, $E=37.6$ MeV, measured $Q$, $^{64}\mathrm{Ga}$ levels; magnetic spectrograph. $^{64}\mathrm{Zn}\ensuremath{-}(^{3}\mathrm{He},2n)$, $\ensuremath{-}(^{3}\mathrm{He},3n)$, $\ensuremath{-}(^{3}\mathrm{He},p2n)$, $E=20\ensuremath{-}70$ MeV, measured $\ensuremath{\sigma}(E)$.]