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Gamma Rays from the Low-Energy Proton Bombardment of Beryllium

1955; American Institute of Physics; Volume: 98; Issue: 5 Linguagem: Inglês

10.1103/physrev.98.1310

1536-6065

R. R. Carlson, Edward Nelson,

Muon and positron interactions and applications

The gamma radiation produced in the ${\mathrm{Be}}^{9}(p, \ensuremath{\gamma}){\mathrm{B}}^{10}$ reaction at proton energies of approximately 300 kev was investigated with scintillation spectrometers. A three-crystal scintillation spectrometer detected 6.7\ifmmode\pm\else\textpm\fi{}0.15, 6.0\ifmmode\pm\else\textpm\fi{}0.1, 5.1\ifmmode\pm\else\textpm\fi{}0.1, and 4.7\ifmmode\pm\else\textpm\fi{}0.15-Mev gamma rays with relative intensities (\ifmmode\pm\else\textpm\fi{}25 percent) of 0.15, 0.40, 1.00 and 0.45, respectively. A thick target yield of (1.2\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}10}$ gamma per proton at 315-kev proton energy was measured for gamma radiation of 5.1-Mev energy. These gamma rays are produced in transitions to the ground-state and low-lying levels in ${\mathrm{B}}^{10}$ and their relative intensities and yield imply spin ${1}^{\ensuremath{-}}$ for the level at 6.89 Mev. A limited single-crystal spectrometer detected 0.41\ifmmode\pm\else\textpm\fi{}0.02, 0.72\ifmmode\pm\else\textpm\fi{}0.02, 1.03\ifmmode\pm\else\textpm\fi{}0.03, and 1.43\ifmmode\pm\else\textpm\fi{}0.03-Mev gamma rays corresponding to transitions between the low-lying levels in ${\mathrm{B}}^{10}$. The angular correlation of the 0.72- and 1.03-Mev gamma rays was found to be consistent with a spin of ${1}^{+}$ or ${2}^{+}$ for the first excited state of ${\mathrm{B}}^{10}$.