Elastic alpha-12C scattering and the 12C(alpha,gamma)16O E2 S factor |
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Authors: | Tischhauser P Azuma R E Buchmann L Detwiler R Giesen U Görres J Heil M Hinnefeld J Käppeler F Kolata J J Schatz H Shotter A Stech E Vouzoukas S Wiescher M |
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Institution: | University of Notre Dame, Notre Dame, Indiana, USA. |
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Abstract: | Angular distributions of 12C(alpha,alpha)12C have been measured for E(alpha) = 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 gamma12 = 0.47 +/- 0.06 MeV(1/2) for the Ex = 6.917 MeV (2+) state in 16O(a = 5.5 fm). The dependence of the chi2 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 gamma12, radiative alpha capture and 16N beta-delayed alpha-decay data, the S factor is calculated at E(c.m.) = 300 keV to be S(E2)(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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