Intermediate and compound-nucleus states in the 16O+16O system

With a jet gas target in the range 8.5 MeV <= Esub(cm) <= 12.6 MeV in steps of ΔEsub(cm)=25 keV excitation functions of the differential cross section of the elastic 16O+16O as well as the 16O(16O,α)28Si reaction were taken up; in selected energy ranges the step width was ΔEsub(cm)=10 keV respectively ΔEsub(cm)=5 keV. In the excitation functions of the 16O+16O system 3 coherence widths could be identified: Beside a width GAMMA1=(975+-200) keV which can be brought in connection with entrance-channel configurations a width GAMMAsub(C)=(28+-8) keV the interpretation of which as compound-nucleus width of the 32S is confirmed by statistical model calculations which yielded for the compound states to be populated by the entrance channel a width of 23.7 keV <GAMMAsub(J)<30.7 keV. Furthermore an intermediate coherence width was identified for which the α reaction yields a value GAMMAsub(int)=(125+-5) keV, while the elastic scattering leads to somewhat larger values (about 150 keV). The dominant part of the cross section is given by the class of states with the width GAMMA1=975 keV. For the analysis of the angular momenta of the states of the compound-system the angular distribution of three O+ transitions of the 28Si were available. For each angular distribution the 8 representations possible at a maximal partial wave Lsub(max)=8 for the scattering amplitudes were determined and for each of the three transitions for each energy a scattering amplitude selected. (orig./HSI)