Radiative Capture of Protons in Carbon from 80 to 126 kev

An excitation curve has been measured for the reaction ${\mathrm{C}}^{12}(p, \ensuremath{\gamma}){\mathrm{N}}^{13}$ in the energy interval 80 kev to 126 kev by utilizing beam currents of 30 ma to 50 ma from the high-current ion injector. The capture-gamma radiation was measured with a 4-in.\ifmmode\times\else\texttimes\fi{}4-in. NaI scintillator which was arranged to count only gamma radiation of the energy appropriate to the reaction. The yield per incident proton ranges from (7.0\ifmmode\pm\else\textpm\fi{}2.3)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}18}$ at 80 kev to (6.2\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}16}$ at 126 kev with corresponding cross sections of (1.4\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}11}$ barn and (6.8\ifmmode\pm\else\textpm\fi{}0.8)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}10}$ barn. A value for the cross section of the reaction ${\mathrm{C}}^{13}(p, \ensuremath{\gamma}){\mathrm{N}}^{14}$ has been obtained at two energies, namely: (8.2\ifmmode\pm\else\textpm\fi{}2.5)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}9}$ barn at 126 kev, and (5.1\ifmmode\pm\else\textpm\fi{}2.0)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}9}$ barn at 114 kev. The results are compared with previous measurements and with extrapolations from the resonance in this reaction at 456 kev by means of the Breit-Wigner single-level dispersion formula.

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