Elastic α-12C Scattering and the 12C(α,γ)16O E2 S Factor

Details Elastic α-12C Scattering and the 12C(α,γ)16O E2 S Factor Elastic α-12C Scattering and the 12C(α,γ)16O E2 S Factor

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrvl..88g2501t&link_type=abstract

Physical Review Letters, vol. 88, Issue 7, id. 072501

Physics

23

Scientific paper

Angular distributions of 12C(α,α)12C have been measured for Eα = 2.6-8.2 MeV, at angles from 24° to 166°, yielding 12 864 data points. R-matrix analysis of the ratios of elastic scattering yields a reduced width amplitude of γ12 = 0.47+/-0.06 MeV1/2 for the Ex = 6.917 MeV(2+) state in 16O(a = 5.5 fm). The dependence of the χ2 surface on the interaction radius a has been investigated and a deep minimum is found at a = 5.42+0.16-0.27 fm. Using this value of γ12, radiative α capture and 16N β-delayed α-decay data, the S factor is calculated at Ec.m. = 300 keV to be SE2(300) = 53+13-18 keV b for destructive interference between the subthreshold resonance tail and the ground state E2 direct capture.

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