Inelastic Scattering of Neutrons byIn115andAu197

Abstract

The metastable states ${\mathrm{In}}^{115m}$ and ${\mathrm{Au}}^{197m}$ have been produced by bombarding indium and gold foils with neutrons (energy spread ±20 to 40 kev). The excitation curve for gold has a threshold at 0.53±0.02 Mev and shows distinct discontinuities in slope at 1.14±0.03 Mev and 1.44±0.03 Mev corresponding to energy levels that decay to the metastable state at 0.54 Mev. The excitation curve for indium has a threshold below 600 Mev and indicates levels at 0.960±0.04 Mev and 1.37±0.04 Mev. Cross-section values cannot be deduced because of inadequate calibration of the scintillation detector.