Abstract
New measurements of differential and total cross sections for the reaction have been made at beam energies of , and 1061 keV. Analysis of the astrophysical factor for the reaction at low energies and of the reaction rates has been carried out within the R-matrix approach by using the previously measured nuclear vertex constant (or the respective asymptotic normalization coefficient) for the virtual decay to fix the direct capture part of the amplitude in . It is demonstrated that the R-matrix approach, using the measured asymptotic normalization coefficient, can be employed as an ideal tool, minimizing the uncertainties associated with a calculation of the direct capture cross section of the reaction at extremely low energies. New information on the proton and width for the first excited state of is obtained.
- Received 23 July 2007
DOI:https://doi.org/10.1103/PhysRevC.78.035802
©2008 American Physical Society