Abstract
The () reaction has been used to study low-lying collective excitations in . Measurements of -ray excitation functions at incident neutron energies from 1.0 to 3.0 MeV and detailed -ray angular distributions at 2.5-MeV neutron energy have led to the placement of many new levels in a level scheme now incorporating 54 levels below 2.4 MeV. In many cases, the assignment of a unique spin-parity has been possible. The positive-parity states compare favorably with interacting boson approximation and boson expansion theory calculations, except for the excitation, which is inconsistent with predictions of both models. No negative-parity band structure is apparent.
NUCLEAR REACTIONS , MeV; measured , , . deduced levels, branching ratios, , . Compared levels and branching ratios to theory. Enriched target, Ge(Li) detector, time-of-flight background suppression.
- Received 13 September 1982
DOI:https://doi.org/10.1103/PhysRevC.27.2608
©1983 American Physical Society