Helium-3-induced charged-particle reactions on K39 have been studied using a solid-state-detector dEdx-E particle-identification telescope. Elastic-scattering angular distributions at He3 energies of 12, 14, and 16 MeV as well as (He3, d) angular distributions at 14 MeV have been measured. The reaction data are found to be characterized by extremely weak transitions to all known positive-parity excited states up to 5.3 MeV. Strong transitions to 15 negative-parity states up to 8.6-MeV excitation are observed and identified with the T=0 components of (d32-1f72) and (d32-1p32,12) configurations and the T=1 analogs of the ground-state quarted in K40 having the (d32-1f72) configuration. Since the distorted-wave method does not give a unique prescription for choosing between the various possible optical potentials which fit elastic scattering, a detailed examination is made of the effects of the choice specific He3 and deuteron potentials, of the inclusion of spin-orbit coupling and nonlocality, and of the different approximations for the bound-state wave function; and the significance of the spectroscopic factors is discussed. The distorted-wave results are compared with the revised predictions of Gillet and Sanderson, and it is concluded that above and beyond the inherent uncertainties in the spectroscopic factors, Gillet and Sanderson's theoretical predictions agree poorly with the experimental results.
ASJC Scopus subject areas
- Physics and Astronomy(all)