An analysis of the ß-delayed a spectrum of 16N and the 12C (a,y) 16O cross section at stellar helium burning energies
University of New Brunswick
The rate of 12C(a,y)16O reaction that occurs in helium burning stars is critical to the evolution of stars over twenty-five solar masses. By K-matrix analysis of the ß -delayed spectrum of 16N it is possible to precisely measure the astrophysical S-factor at centre-of-mass energies around 300 keV, corresponding to a temperature of 1 billion Kelvins. An updated analysis of the data from the TISOL isotope separator is presented here. Using the TISOL data and the previous y-ray data, the K-matrix parameters have been simultaneously fitted, giving a value of S(E = 300 keV) = 83 ± 16 keV b for the El part of the 12C(a,y)16.