12C(6Li, d)16O and 16O(6Li, d)20Ne at E(6Li) = 42 MeV

Spectra up to 25 MeV excitation in 16O have been obtained from 12C(6Li, d) at 42 MeV bombarding energy. Angular distributions have been measured for ten states, including two Jsup(π) = 1- states of astrophysical interest, and appear to be mostly direct α-transfer. In addition, data for 16O(6Li, d)20Ne(g, s) and 20Ne*(2+) have been obtained. Excitation energies and widths have been extracted for states in 16O, including several states at Esub(x) > 15 MeV. Alpha spectroscopic factors, Ssub(α) and reduced α-Widths, γ2sub(α) and theta2sub(α) have been deduced for levels in 16O and 20Ne and compared with theoretical predictions. The Jsup(π) = 1- levels in 16O at 7.12 and 9.6 MeV excitation appear to have comparable Ssub(α) and γ2sub(α) values, viz, γ2sub(α) (7.12 MeV)/γ2sub(α) (9.6 MeV) = 0.6(+1.7-0.3). Both states have apparent Ssub(α) and theta2sub(α) values smaller than that for the Jsup(π) = 2+ 'α-cluster' state at 6.9 MeV however. Furthermore, the observed line shape for the Jsup(π) = 1-, 9.6 MeV level indicates GAMMAsub(c.m.) = 400 +- 50 keV, which is substantially less than the accepted width for this level (GAMMAsub(c.m.) = 510 +- 60 keV). The possible implications of these results for stellar helium burning calculations are discussed. (Auth.)