Ge73(n,γ)Ge74Gamma-Ray Spectrum and Energy Levels ofGe74

The $\gamma$-ray spectra resulting from thermal-neutron capture in targets of natural germanium and enriched ${\mathrm{Ge}}^{73}$ were measured with a Ge(Li) germanium detector. The energies and intensities of 85 $\gamma$ rays in the energy range 0.20-3.00 MeV and 47 $\gamma$ rays in the range 6.1-9.6 MeV were identified with the reaction ${\mathrm{Ge}}^{73}(n,\gamma ){\mathrm{Ge}}^{74}$. The $\gamma$-ray spectrum was used to suggest four new levels, and place limits on the spins and partities of three other levels. Errors in the $\gamma$-ray energy values were reduced to less than 3 keV in all cases, and to less than 1 keV for many. Based on this experiment and other information, the energy levels identified below 3 MeV were 0.0 ($0^{+}$), 596.3 ($2^{+}$), 1204.9 ($2^{+}$), 1466.2 ($4^{+}$), [1486 ($0^{+}$)], [1697.7], 1699.9 ($3^{\pm }$, $4^{+}$, 2168.3 ($3^{\pm }$, $4^{+}$), 2200.2 ($2^{+}$), 2539.3 ($3^{-}$), 2574.1, 2672.4, [2695.8], 2699.1, 2833.2, 2929.2, 2939.7, and 2978.1 keV, where the levels in brackets were not fed directly from the capture state. The level energies were determined to with 1 keV. The energy of the capture state in the compound nucleus (${\mathrm{Ge}}^{73}+n$) was found to be 10 203.1±0.9 keV.