Abstract
In order to examine the characteristics of the -induced Coulomb excitation process and the validity of the cross-section ratio technique for the identification of both and transitions, thick-target radiation yield ratios have been measured for -and -induced Coulomb excitation of each of the 110- and 197-kev levels of , the 446-kev level of , the 160-kev level of , and the 126-kev level of at corresponding (equal ) energies. For the transitions a mean ratio of the - to -induced yields of 0.63±0.02 was found, independent of incident energy in the range 1.0 to 2.5 Mev, in agreement with the calculated value of 0.64 for and and of 0.63 for and . In the single transition (110 kev in ) studied, the experimental ratios range from 0.76±0.07 at at Mev. While in accord with the theoretical prediction of 0.76 at the lower energies, the indicated energy dependence of the ratio is suggestive of contributions due to nuclear inelastic scattering of alpha particles. It has been demonstrated that the ratio technique, using and ions, provides an unambiguous multipolarity determination provided that inelastic-scattering contributions can be excluded.
- Received 2 March 1959
DOI:https://doi.org/10.1103/PhysRev.115.586
©1959 American Physical Society