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Nuclear Physics A 752 (2005) 514c
New determination of the $^{12}C (\alpha, \gamma)^{16}O$ reaction rate from the gamma-ray angular distribution measurements
J.W. Hammer, M. Fey, R. Kunz, J. Kiener1, V. Tatischeff1, F. Haas2, J.L. Weil, M. Assuncao1, C. Beck2, C. Boukari-Pelissie1, A. Coc1, J.J. Correia1, S. Courtin2, F. Fleurot, E. Galanopoulos, C. Grama1, F. Hammache, S. Harissopulos, A. Korichi1, E. Krmpotic, D. Le Du1, A. Lopez-Martens1, D. Malcherek, R. Meunier1, P. Papka2, Th. Paradellis, M. Rousseau2, N. Rowley2, G. Staudt, S. Szilner

The astrophysical reaction rate of the key reaction 12C(alpha,gamma)16O has been determined with the +/- 25% accuracy by two direct experiments at the Stuttgart DYNAMITRON in the framework of a large internatiuonal collaboration. The E1 and E2 capture amplitudes were deduced from 37 new gamma angular distributions in the energy range Ecm = 0.89-2.8 MeV. Highest sensitivity at a picobarn level was reached by using either a close 4pi array of 9 EUROGAM Phase II detectors or the GANDI array of 4 large movable Ge detectors. The S-factor values of the S_E1 and S_E2 excitation functions were calculated by a R-matrix analysis considering also elastic alpha-scattering data and the beta-delayed alpha-decay on 16N.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :  IReS - Institut de Recherches Subatomiques
Physique/Physique Nucléaire Expérimentale
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