p-Wave Resonances ofU238

Abstract

The neutron transmission of a thick sample of ${\mathrm{U}}^{238}$ has been measured over the energy range 0-200 eV with exceptionally good statistical accuracy. The extremely small transmission dips that are detected are interpreted as $p$-wave resonances, and their resonance parameters are derived. The probability argument used to identify the $p$-wave resonances is applicable to most nuclides.