γ-ray cascade transitions in112Cd and114Cd following resonance capture of epithermal neutrons

Abstract

Cascades of $\ensuremath{\gamma}$-ray transitions in ${}^{112}$Cd and ${}^{114}$Cd have been studied in a neutron-capture experiment at the Los Alamos Neutron Science Center using a highly segmented and highly efficient $\ensuremath{\gamma}$-ray calorimeter---Detector for Advanced Neutron Capture Experiments. Intensity distributions of two-, three-, and multifold coincidence $\ensuremath{\gamma}$-ray transitions de-exciting resonances with known angular momenta and terminating at the ground state and at the first excited levels have been obtained. The results are compared with statistical-model calculations using the code dicebox for the two theoretical models of electric-dipole photon-strength functions, the standard Lorentzian and the model of Kadmenskii, Markushev, and Furman. It has been found that a combination of the two models reproduces the data best. Adding resonance structures, such as the scissors mode and the pygmy resonance, to the photon-strength function do not improve the description of the $\ensuremath{\gamma}$-ray spectra.