Pair Spectrometer Measurements of the Radiations from Excited States of Light Nuceli

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Abstract

A magnetic-lens pair spectrometer has been used to study the radiations produced by the bombardment of certain light nuclei with protons and deuterons from a Van de Graaff accelerator. Gamma rays from the bombardment of ${\mathrm{F}}^{19}$ with 3.7-Mev protons were observed at 6.10\ifmmode\pm\else\textpm\fi{}0.04 and 6.99\ifmmode\pm\else\textpm\fi{}0.04 Mev. At 4.7-Mev bombarding energy, no lines were observed between 7.5 and 11.0 Mev with an intensity as great as 10 percent of that of the 6.99-Mev line. Gamma rays from the bombardment of ${\mathrm{C}}^{13}$ with 2.0-Mev deuterons were observed at 3.42\ifmmode\pm\else\textpm\fi{}0.03, 3.71\ifmmode\pm\else\textpm\fi{}0.05, 3.94\ifmmode\pm\else\textpm\fi{}0.06, 4.48\ifmmode\pm\else\textpm\fi{}0.04, 4.96\ifmmode\pm\else\textpm\fi{}0.03, 5.12\ifmmode\pm\else\textpm\fi{}0.04, 5.74\ifmmode\pm\else\textpm\fi{}0.03, 6.14 \ifmmode\pm\else\textpm\fi{}0.03, 6.53\ifmmode\pm\else\textpm\fi{}0.05, and 6.72\ifmmode\pm\else\textpm\fi{}0.03 Mev. At 4.0-Mev bombarding energy, lines were observed at 6.14\ifmmode\pm\else\textpm\fi{}0.03, 6.53\ifmmode\pm\else\textpm\fi{}0.04, 6.72\ifmmode\pm\else\textpm\fi{}0.03, 7.09\ifmmode\pm\else\textpm\fi{}0.03, and 7.34\ifmmode\pm\else\textpm\fi{}0.04 Mev. Gamma rays from the bombardment of ${\mathrm{C}}^{12}$ with 4.0-Mev deuterons were observed at 3.76\ifmmode\pm\else\textpm\fi{}0.02 and 3.86\ifmmode\pm\else\textpm\fi{}0.02 Mev. No lines were observed between 3.86 and 5.8 Mev with an intensity as great as 10 percent of that of the 3.86-Mev line. All the energies of $\ensuremath{\gamma}$ rays given above are uncorrected for Doppler shifts which in some cases are as large as 40 kev. A search was made for nuclear pairs which might originate from the proton bombardment of ${\mathrm{B}}^{11}$. No pairs were observed at 4.0-Mev bombarding energy in the energy range between 6.5 and 9.5 Mev. A search was also made for nuclear pairs which might result from the ${\mathrm{Li}}^{7}(d, n){\mathrm{Be}}^{8}$ reaction. No pairs were observed in the energy range between 5.0 and 8.5 Mev.

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