Abstract
Excitation functions have been measured at a laboratory angle of 5° over an incident energy range of 18-25.5 MeV (c.m.) for the reaction leading to about 30 levels in ( MeV). Angular distributions were measured at five energies. An Ericson fluctuation analysis yields the result that most levels are populated by a large nonstatistical reaction component. A significant compound-nuclear component is also present, with correlation widths on the order of 150-250 keV (c.m.). The energy-averaged cross sections have been compared with statistical compound-nuclear (Hauser-Feshbach) calculations. This comparison indicates the presence of a strong direct-reaction mechanism, especially for the members of the proposed 8p-4h band (at 7.196, 7.834, 9.040, and 12.16 MeV). A pronounced minimum in the excitation functions is evident at MeV, near the recently reported strong resonance in the channel. Other correlated effects also appear to be present at specific energies, but the cross correlations, calculated for the entire energy range, are largely statistical.
NUCLEAR REACTIONS , 5° yield curves MeV, angular distribution 37, 41, 45, 48, and 51 MeV, statistical analyses.
- Received 13 March 1975
DOI:https://doi.org/10.1103/PhysRevC.12.156
©1975 American Physical Society