Neutron-Producing Reactions by Deuteron Bombardment Ofb11

The neutrons produced by deuteron bombardment of a thin, enriched ${\mathrm{B}}^{11}$ target have been studied for nine different deuteron energies ranging from 1.60 to 2.70 MeV. The absolute differential cross sections for the production of neutrons feeding well-established states in ${\mathrm{C}}^{12}$ were determined. In addition to the monoenergetic neutron groups feeding the states of ${\mathrm{C}}^{12}$, previously unreported continuum neutrons due to many-body breakup of deuteron plus ${\mathrm{B}}^{11}$ system were observed and analyzed. The breakup mechanism is inferred to be a direct reaction process rather than the compound nucleus process. The angular distributions of neutrons leaving ${\mathrm{C}}^{12}$ in 15.11 MeV (${1}^{+}$), $Q=\ensuremath{-}1.37 \mathrm{MeV} \mathrm{and} 12.73 \mathrm{MeV}$ (${1}^{+}$), $Q=+1.00$ MeV states were studied in detail. The effect of compound resonance at ${E}_{d}=2.18$ MeV on the angular distributions of the above neutron groups was studied. The investigations were performed employing time-of-flight technique utilizing pre-acceleration pulsed, post-acceleration bunched deuteron beam from a 3-MeV Van de Graaff accelerator.