Resonant and Nonresonant Capture of Slow Neutrons inTm169(n, γ)Tm170

The intensities of radiative transitions following slow-neutron capture in ${\mathrm{Tm}}^{169}(n, \gamma ){\mathrm{Tm}}^{170}$ have been measured for neutron energies up to ∼136 eV. From the determination of the strengths of transitions feeding final states in ${\mathrm{Tm}}^{170}$, the partial radiative widths of resonances below 136 eV are determined, and the partial cross sections ${\sigma }_{n\gamma f}$ below 30 eV are fitted with a simple Breit-Wigner multilevel formula. A direct amplitude is necessary to achieve good fits for several transitions, including that to the ground state. The correlation of the direct amplitude to the strength of the state as observed in ($d, p$) is investigated.