Elastic alpha- C-12 Scattering and the C-12 (alpha, gamma) O-16 E-2 S Factor
Feb 18, 2002
4 pages
Published in:
- Phys.Rev.Lett. 88 (2002) 072501
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Abstract: (APS)
Angular distributions of 12C(α,α)12C have been measured for Eα=2.6–8.2MeV, 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±0.06MeV1/2 for the Ex=6.917MeV(2+) state in 16O(a=5.5fm). The dependence of the χ2 surface on the interaction radius a has been investigated and a deep minimum is found at a=5.42−0.27+0.16fm. Using this value of γ12, radiative α capture and 16N β-delayed α-decay data, the S factor is calculated at Ec.m.=300keV to be SE2(300)=53−18+13keVb for destructive interference between the subthreshold resonance tail and the ground state E2 direct capture.- 25.40.Ny
- 26.50.+x
- 26.30.+k
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