Gamma-Ray and Neutron Yields from the Proton Bombardment of Boron

Abstract

Yield curves of the gamma rays and neutrons resulting from the proton bombardment of boron have been measured for proton energies from approximately 2 to 5 Mev. Both the 0\ifmmode^\circ\else\textdegree\fi{} and 90\ifmmode^\circ\else\textdegree\fi{} yields for the ${\mathrm{B}}^{11}(p, \ensuremath{\gamma}){\mathrm{C}}^{12}$ reaction have been measured for the ground state transition and for the transition to the 4.43-Mev state in ${\mathrm{C}}^{12}$, as has the yield of the 2.14-Mev $\ensuremath{\gamma}$ ray resulting from the inelastic scattering of protons on ${\mathrm{B}}^{11}$. The neutron yield from ${\mathrm{B}}^{11}(p, n){\mathrm{C}}^{11}$ is given at 0\ifmmode^\circ\else\textdegree\fi{} and for almost $2\ensuremath{\pi}$ solid angle in the forward direction. New levels were observed in the ${\mathrm{C}}^{12}$ compound nucleus at 18.3, 18.39, 18.84, 19.2, 19.41, 19.66, 19.87, 20.25, 20.48, and 20.64 Mev. Preliminary data are given for the ${\mathrm{B}}^{10}(p, n){\mathrm{C}}^{10}$ and ${\mathrm{B}}^{10}(p, \ensuremath{\gamma}){\mathrm{C}}^{11}$ reactions.