Abstract

The neutron total cross sections of carbon, oxygen, fluorine and thorium have been measured in the energy range of 3.3 to 5.0 MeV. Measurements were made with a good-geometry arrangement and an energy resolution of about 20 keV, using a neutron detector which had a high efficiency and a good characteristic for gamma-ray discrimination. For carbon, oxygen and fluorine, several resonances in the cross sections were analyzed to give spin assignments. For thorium, a giant resonance was observed at 4.2±0.2 MeV.

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