Valency neutron capture in 92Mo(n,γ)93Mo

Capture γ-ray spectra from the ⁹²Mo(n,γ)⁹³Mo reaction were measured for neutron energies below 100 keV using the 10-m flight path at the Oak Ridge electron linear accelerator. For neutron energies less than 25 keV a total of 23 different s- and p-wave resonances were resolved. The neutron binding energy is 8067.4± 1.5 keV. The partial radiation widths for the 12 highest energy γ rays which populate positive-parity states below 2.5-MeV excitation were deduced and compared to the valency-model predictions of Lane and Lynn. For γ-ray energies less than 6.5 MeV, the average M1 partial radiation width is approximately equal to the average E1 partial radiation width. The reduced transition strengths as defined by Bartholomew for these transitions are k̄(E1)=(1.2±0.2)×10⁻³ and k̄(M1)=(11.5±2.3)×10⁻³. For the 7126-keV transition to the s_1/2 first excited state the average reduced strength is enhanced by a factor of 5 and 2 for the E1 and M1 transitions, respectively. Nearly 30% of this enhancement for the E1 multipoles is attributed to the valency-model contribution while the remainder is assigned to other processes such as the giant dipole resonance and doorway-state components. The average E2 width for the 8067-keV ground-state γ rays is approximately 10% of the average E1 ground-state width.