The E1 and E2 capture amplitudes in C-12(alpha,gamma(0))O-16

Excitation functions of the gamma(o) capture transition in C-12(alpha, gamm a)O-16 at theta(gamma) = 90 degrees were obtained using a 4 x 4" EGO crysta l in close geometry (E = 0.94 to 3.39 MeV) and a 2 x 2" EGO crystal in far geometry (E = 1.69 to 3.29 MeV), where the study of the reaction was initia ted in inverse kinematics involving a windowless gas target. The small crys tal detected essentially the E1 multipole component in the gamma(o) capture transition, while the large crystal observed approximately the angle-integ rated sum of the E1 and E2 multipole components. Analysis of the two data s ets together with data from previous work provided strong evidence that bot h multipoles are of equal importance at the relevant stellar energy E-o = 0 .3 MeV.