Physics – Nuclear Physics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvc..48.2746d&link_type=abstract
Physical Review C (Nuclear Physics), Volume 48, Issue 6, December 1993, pp.2746-2752
Physics
Nuclear Physics
11
Cluster Models, 20<=A<=38
Scientific paper
The three-cluster generator coordinate method is applied to different properties of T=1/2 21-nucleon systems. The 21Ne and 21Na nuclei are described by mixing of different 16O+α+n or 16O+α+p configurations. A fair agreement with experiment is found for energy spectra and for electromagnetic transition probabilities. We present 17O+α and 20Ne+n elastic phase shifts, as well as 17O(α,γ)21Ne and 17O(α,n)20Ne low-energy cross sections. The ratio between the corresponding reaction rates is predicted 5 orders of magnitude lower than values currently used in astrophysics. We also compare 20Ne(p,p')20Ne(2+), 20Ne(p,α)17F, and 20Ne (p,γ)21Na theoretical cross sections with experimental data. For the proton capture reaction, important in stellar evolution, we do not suggest significant differences with the existing reaction rate.
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