Physics – Nuclear Physics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978nupha.297..489t&link_type=abstract
Nuclear Physics A, Volume 297, Issue 3, p. 489-519.
Physics
Nuclear Physics
12
Nuclear Reactions
Scientific paper
The 18O(α, γ)22Ne capture reaction has been studied at Eα = 0.6-2.3 MeV. The known resonance at Eα = 2.20 MeV has been established and fourteen new resonances have been found in the energy range covered. The Eα = 1.16, 1.32, 1.45, 1.53, 1.87, 1.96 and 2.15 MeV resonances correspond to resonances observed previously in the 18O(α, n)21Ne reaction. The Eα = 0.77, 1.25 and 1.27 MeV resonances represent new compound states in 22Ne. Information on branching ratios, ωγ values and total widths is reported. Transition strength arguments and analyses of γ-ray angular distribution data together with results from previous work resulted in the most likely Jπ assignments for the resonances.
The Eα = 1.66 and 1.78 MeV resonances are good candidates for the two Jπ = 8+ states predicted at Ex ~ 11-12 MeV and are probably members of the Kπ = 0+ (ground state) and Kπ = 2+ rotational bands in 22Ne.
The investigated energy range of Eα together with that of previous work corresponds to stellar temperatures of T = (0.3-4.3) × 109 K. The astrophysical reaction rate determined from these data is compared with predictions based in part on the nuclear optical model. The rate is also compared with that of the competing 18O(α, n)21Ne reaction.
Hammer Wolfgang J.
Kettner K. U.
Rolfs Claus
Trautvetter Hanns-Peter
Wiescher Michael
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