Abstract
A combined analysis of absolute in-plane and -axis (spin-flip) angular correlation measurements for -- transitions leads to various combinations of substate cross sections, populations, and phase angles. These quantities are compared with predictions based on reaction-mechanism theories. The test is very stringent. Measurements and analyses have been carried out for (4.44 MeV) and (1.45 MeV) at MeV, and for (1.41 MeV) at MeV.
Each of the three nuclei studied exhibits the following qualitative features: (1) The total inelastic cross sections have a less pronounced structure than do the individual substate cross sections. (2) The cross section is the most diffractionlike; the oscillations are out of phase with respect to the oscillations of the elastic cross section. (3) The sum of the and cross sections also are diffractionlike, but are not in phase with the .
Detailed comparisons with collective-model distorted-wave Born-approximation predictions are, on the whole, quite good for and , especially when the full Thomas form for the spin-dependent perturbation potential is used. The isotropic term in the in-plane angular-correlation function is particularly sensitive to the form and strength of the spinorbit coupling potential. For the predictions are further improved when the strength of the spin-dependent perturbation potential is increased by setting the spin-dependent deformation equal to twice the central-potential deformation.
- Received 19 October 1971
DOI:https://doi.org/10.1103/PhysRevC.5.864
©1972 American Physical Society