Resonance Neutron Capture inNb93

Abstract

Spectra from radiative capture in $S-$ and $P-$wave resonances in ${\mathrm{Nb}}^{93}$ have been compared. Differences in these spectra are interpreted to indicate the presence of sizable two-particle—one-hole components in the capturing states. $S-$wave intensities show no correlation with ($d,p$) intensities to the same final states, but $P$-wave intensities exhibit a significant correlation. Lack of a correlation with the initial-state reduced widths rules out an appreciable channel-capture effect in this experiment. The differences in $S-$ and $P$-wave total radiation widths are discussed. Seven neutron-resonance spin assignments are made, based on the capture $\gamma$-ray spectra, and 11 new final states in ${\mathrm{Nb}}^{94}$ are observed and tabulated.