Elastic alpha-12C scattering and the 12C(alpha,gamma)16O E2 S factor

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+) st...

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Published in:Physical review letters 2002-02, Vol.88 (7), p.072501-072501
Main 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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container_issue 7
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container_title Physical review letters
container_volume 88
creator 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
description 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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title Elastic alpha-12C scattering and the 12C(alpha,gamma)16O E2 S factor
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