Precision Measurements of Gamma-Ray Energies in the Region from 2.3 to 7.1 MeV

Abstract

Precision energy measurements have been made on $\ensuremath{\gamma}$ rays in the region from 2.3 to 7.1 MeV by means of Ge(Li) detectors and a gain-stabilized pulse-height analyzer system. The transitions studied include certain non-Doppler-broadened $\ensuremath{\gamma}$ rays occurring in the reactions ${\mathrm{C}}^{12}({\mathrm{He}}^{3},p){\mathrm{N}}^{14}$, ${\mathrm{N}}^{14}(d,p){\mathrm{N}}^{15}$, ${\mathrm{N}}^{14}(d,n){\mathrm{O}}^{15}$, and ${\mathrm{F}}^{19}(p,\ensuremath{\alpha}){\mathrm{O}}^{16}$ and the $\ensuremath{\gamma}$ rays emitted in the radioactive decays of ${\mathrm{B}}^{12}$, ${\mathrm{C}}^{15}$, ${\mathrm{O}}^{14}$, and ${\mathrm{N}}^{16}$. In most cases energy calibrations were made with mixed sources and the extension to higher energies depended on the assumption of 1022.01 keV for the energy separation between full-energy-loss and two-escape peaks. The $\ensuremath{\gamma}$-ray energies in keV, with the nucleus from which they originate in parentheses, were determined to be the following: 2312.68\ifmmode\pm\else\textpm\fi{}0.10 (${\mathrm{N}}^{14}$), 2792.68\ifmmode\pm\else\textpm\fi{}0.15 (${\mathrm{N}}^{14}$), 4438.91\ifmmode\pm\else\textpm\fi{}0.31 (${\mathrm{C}}^{12}$), 5104.87\ifmmode\pm\else\textpm\fi{}0.18 (${\mathrm{N}}^{14}$), 5240.53\ifmmode\pm\else\textpm\fi{}0.52 (${\mathrm{O}}^{15}$), 5270.60\ifmmode\pm\else\textpm\fi{}0.46 (${\mathrm{N}}^{15}$), 5299.03\ifmmode\pm\else\textpm\fi{}0.43 (${\mathrm{N}}^{15}$), 6129.96\ifmmode\pm\else\textpm\fi{}0.46 (${\mathrm{O}}^{16}$), and 7117.02\ifmmode\pm\else\textpm\fi{}0.49 (${\mathrm{O}}^{16}$).