Abstract
The thermal-neutron-capture -ray spectra following the reactions and were studied with the aid of a Ge(Li) detector operated in the singles and pair-spectrometer modes. The use of isotopically enriched targets led to unambiguous assignments of 33 primary transitions in and 46 transitions issuing from the capture state in . In each nuclide, these transitions were used to define the low-lying states to an accuracy of ∼±1 keV up to an excitation energy of ∼1300 keV. The observed strengths of the primary transitions are examined to determine the possible presence of systematic regularities of the type reported in the rare-earth rotational region. Comparisons are made between these data and previous () studies with a view toward establishment of the parity of the states populated in both reactions.
- Received 22 December 1966
DOI:https://doi.org/10.1103/PhysRev.157.1131
©1967 American Physical Society