β-delayed α spectrum of 16N and the 12C(α,γ)16O cross section at low energies

Creators: Buchmann, L.; Azuma, R. E.; Barnes, C. A.; D'Auria, J. M.; Dombsky, M.; Giesen, U.; Jackson, K. P.; King, J. D.; Korteling, R. G.; McNeely, P.; Powell, J.; Roy, G.; Vincent, J.; Wang, T. R.; Wong, S. S. M.; Wrean, P. R.

Abstract

The α spectrum following the β decay of 16N from the isotope separator TISOL has been measured by detecting 106 α particles in coincidence with 12C nuclei. These data, which show a low-energy interference anomaly accompanying the main α peak, permit a more precise determination of the p-wave amplitude of the astrophysically important reaction 12C(α,γ)16O. The α spectrum and previous γ-ray data have been fitted simultaneously by a K-matrix parametrization; a value of S(E=0.3 MeV)=57±13 keV b has been obtained for the E1 part of the 12C(α,γ)16O reaction.

Additional Information

©1993 The American Physical Society. Received 3 November 1992. We wish to thank H. Biegenzein, D. Jones, P. Machule, H. Sprenger, A. Wilson, and G. Sheffer for help with the technical aspects of the experiment, and D. Diel and P.W. Green for assistance with the data acquisition system. Our special thanks goes to Teleglobe Canada for the donation of a 6 GHZ amplifier without which the operation of the ECR source at TISOL and this experiment would not have been possible. The help of A. Chen, J. Chen, and M. Trinczek is gratefully acknowledged. One of the authors (R.E.A.) wishes to express his thanks to the Kellogg Radiation Laboratory at Caltech for their hospitality during the early stages of the experiment. This work was supported in part by TRIUMF, by the Natural Sciences and Engineering Research Council of Canada, and by the National Science Foundation (Grant NO. PHY-91-15574).

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