Abstract
Elastic and inelastic scattering of monochromatic photons were used for studying nuclear energy levels in ; 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 . The angular distributions of the elastic and inelastic lines were measured and the following spin-parity determinations were made (energy in keV, ): 617, ; 1223, ; 1429, ; 1468, ; 1869, ; 2832, ; 2850, ; 3110, 2; 3193, 2; 3247, 0; and 7632, . 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 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.
- Received 18 June 1971
DOI:https://doi.org/10.1103/PhysRevC.4.2265
©1971 American Physical Society