Neutron radiative capture cross sections have been measured in the energy region 20 to 80 keV using time-of-flight techniques and a 12.7 c m x 10.2 cm NaI(T1) scintillator as y-ray detector. The samples studied were natural samples of F, Mg, AI, Si, P and S. Radiative widths were determined for the resonances in 19F at 27 keV (1.4k0.3 eV) and 50 keV (1.5k0.3 eV), in zrMg at 84 keV (4.0f0.9 eV) and in 27Al at 35 keV (1.9i0.3 eV). Resonances were also observed in Mg at 45 keV, in Si at 38 keV and 68 keV, in P at 27 keV and in S at 30 keV and 42 keV.

The gamma-ray spectra from neutron resonance capture in Mg, Si, P and S (natural samples) in the energy range 10-75 keV have been recorded. The gamma-ray spectrometer was a NaI(Tl) crystal, 20.8 cm long and 22.6 cm in diameter. Time-of-flight techniques were used. The gamma-ray spectra were found to be dominated by a few intense primary gamma-ray lines to low-lying levels in agreement with previous observations. Branching ratios are given for the dominating primary lines.

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