Study of the energy levels of Cd112 using nuclear photoexcitation

Elastic and inelastic scattering of monochromatic photons were used for studying nuclear energy levels in Cd112; the photons were produced by thermal-neutron capture in iron. The energy of the resonance level was 7632 keV; it was found to decay to 19 known low-lying energy levels in Cd112. The angular distributions of the elastic and inelastic lines were measured and the following spin-parity determinations were made (energy in keV, Jπ): 617, 2+; 1223, 0+; 1429, 0+; 1468, 2+; 1869, 0+; 2832, 0+; 2850, 2+; 3110, 2; 3193, 2; 3247, 0; and 7632, 1-. The parity of the last level was directly determined by polarization measurements, while the parities of the other levels were inferred from the radiation strength of the corresponding high-energy transitions. The M2E1 mixing ratio for one primary transition was found to be about 3 orders of magnitude higher than that predicted by the simple theory. The results of statistical analysis of the data are given.