Physics – Nuclear Physics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978nupha.305..313b&link_type=abstract
Nuclear Physics A, Volume 305, Issue 1, p. 313-332.
Physics
Nuclear Physics
17
Nuclear Reactions
Scientific paper
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 Jπ = 1- states of astrophysical interest, and appear to be mostly direct α-transfer. In addition, data for 16(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 Ex > 15 MeV. Alpha spectroscopic factors, Sα, and reduced α-widths, γ2α and θ2α have been deduced for levels in 16O and 20Ne and compared with theoretical predictions. The Jπ = 1- levels in 16O at 7.12 and 9.6 MeV excitation appear to have comparable Sα and γ2α values, viz. γ2α (7.12 MeV)/γ2α (9.6 MeV) = 0.6+1.7-0.3. Both states have apparent Sα and γ2α values smaller than that for the Jπ = 2+ ``α-cluster'' state at 6.9 MeV however. Furthermore, the observed line shape for the Jα = 1-, 9.6 MeV level indicates Γc.m. = 400 +/- 50 keV, which is substantially less than the accepted width for this level Γc.m. = 510+/-60 keV). The possible implications of these results for stellar helium burning calculations are discussed.
Becchetti F. D.
Janecke J.
Thorn Craig E.
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