New Germanium Isotope,Ge65

A new germanium isotope, ${\mathrm{Ge}}^{65}$, has been produced by the ($\alpha , 3n$) reaction on ${\mathrm{Zn}}^{64}$. The mass assignment was established through cross bombardments, "milking" experiments, and excitation function measurements. The half-life of ${\mathrm{Ge}}^{65}$ is 1.5±0.2 minutes. It decays by positron emission to 15-minute ${\mathrm{Ga}}^{65}$. The ground-state transition occurs in over 90% of the disintegrations and has a positron end-point energy of 3.7±0.4 Mev and a $log\mathrm{}\left(\mathrm{ft}\right)\mathrm{}$ value of 4.8. Gamma rays of 0.67 Mev and 1.72 Mev have been observed with intensities of $\frac{0.03}{{\beta }^{+}}$ and $\frac{0.02}{{\beta }^{+}}$, respectively.