The Parameters for the Slow Neutron Resonance in Rhodium

Abstract

Measurements of the 1.26-ev resonance in rhodium have been made with a crystal spectrometer and the following values were obtained for the parameters: $E_0=1.260\mathrm{}\pm 0.004$ ev, ${\sigma }_0=(5000\mathrm{}\pm 200)\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$, $\Gamma =0.156\mathrm{}\pm 0.005$ ev, $g{\Gamma }_n=(3.8\mathrm{}\pm 0.2)\times {10}^{-4\mathrm{}}$ ev, and ${\sigma }_{\mathrm{fa}}=(5.5\mathrm{}\pm 1.0)\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$. The shape of the resonance agrees to very high accuracy with the one-level Breit-Wigner formula. The procedure is discussed for analyzing experimental data in cases where small corrections are required for instrument resolution and Doppler broadening.