Gamma-Rays from Deuteron Bombardment of B10, B11, N14, and F19

Abstract

A pair spectrometer has been used to analyze the high energy gamma-ray spectra produced by bombarding thick targets of natural boron, enriched boron, nitrogen, and fluorine with 1.56-Mev deuterons from a Van de Graaff generator. The ${\mathrm{B}}^{10}+d$ spectrum shows gamma-rays of energy 4.52±0.10, 6.71±0.13, and 9.04±0.18 Mev; the spectrum from ${\mathrm{B}}^{11}+d$, partially masked by the strong ${\mathrm{B}}^{10}+d$ gamma-rays, shows a single 4.5±0.1-Mev gamma-ray. The nitrogen target produced strong gamma-rays of energy 5.33±0.11, 7.40±0.15, and 8.46±0.17 Mev, with some indication of unresolved lines at 4.4 and 6.4 Mev. The ${\mathrm{F}}^{19}+d$ spectrum shows weak high energy gamma-rays, not previously observed, of energy 8.1±0.4, 9.3±0.3, and 11.5±0.4 Mev; a level in ${\mathrm{Ne}}^{20}$ at 11.5±0.4 Mev is indicated. In any of these spectra lower energy gamma-rays may be present though undetected, because of the large variation of spectrometer sensitivity with energy. Absolute yield values are estimated for each of these gamma-rays.